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1
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MARCELO SANTANA DE ALMEIDA
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Proposal for the implementation of a communication circuit for ultra-dense networks of active electrodes for EEG equipment.
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Leader : TALES CLEBER PIMENTA
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MEMBRES DE LA BANQUE :
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ALEXANDRE BARATELLA LUGLI
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GABRIEL ANTONIO FANELLI DE SOUZA
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TALES CLEBER PIMENTA
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Data: 24 févr. 2022
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Afficher le Résumé
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Although traditional electroencephalogram equipment is used on a large scale in the clinical environment, it is common for them to present problems such as electromagnetic interference readings from their electrodes, low-resolution capability in their exams, due to the small number of electrodes to obtain information, and their low mobility, due to the large number cables for your communication.
Thus, through this work, a solution was proposed that focuses on the development of a concentrator circuit and a secondary circuit, which are responsible for exchanging information from the ultra-dense network of active electrodes (512 or more), as well as sending this information to an external source - microcomputers, routers, and wireless equipment - where this information will be stored and processed and a communication protocol, which will use a single wire to carry out such information exchange.
The blocks of the concentrator and the secondary circuits were implemented using the descriptive language Verilog ®, through smaller blocks, being constituted by a serializer circuit and a parallelizing circuit, allowing the exchange of data through the bus, a tri-state circuit, enabling the control of the transmission of information and a circuit responsible for the coordinated operation of the previous circuits in the realization of external requests.
The implemented circuits were tested and validated through FPGAs, demonstrating the ability to perform external requests, with the exchange of information using a single communication wire. Where a digital oscilloscope was used to monitor and prove this communication.
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2
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JOHNNY JOSÉ OROZCO NIVELO
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Analysis of Study Methodologies for Starting Large Motors in Isolated Electrical Systems
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Leader : JOSE MARIA DE CARVALHO FILHO
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MEMBRES DE LA BANQUE :
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FERNANDO NUNES BELCHIOR
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FREDERICO OLIVEIRA PASSOS
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JOSE MARIA DE CARVALHO FILHO
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MARCEL FERNANDO DA COSTA PARENTONI
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Data: 3 mars 2022
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Afficher le Résumé
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This dissertation presents a comparative analysis between the two main methodologies used to carry out the studies of motor starting, the first called the static method (snapshot), in the frequency domain, and the second, called the dynamic method (The Speed- Torque and acceleration-Time), in the time domain, using as a case study a typical offshore platform composed of generators and large induction motors. For this, the software Power Tools for Windows (PTW) and the real-time digital simulator (RTDS) were used to perform the analysis of the two methodologies. From the results of the case study, the main advantages and disadvantages of each one are pointed out, as well as the differences in the requirements associated with the parameters of the electrical system equipment necessary to apply each methodology. The simulation results showed that the study of motor starting in the time domain provides more complete information than the static one, even more for this type of system in particular. This work reveals the need for the selection criteria between the two methodologies to be defined in the IEEE 3002.7-2018 standard and for isolated systems it is highly recommended to perform a time domain analysis.
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3
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ANTONIO GABRIEL MARQUES MULLER
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Rehabilitation and renovation of substations: aspects related to equipment, reliability and physical arrangement
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Leader : JOSE MARIA DE CARVALHO FILHO
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MEMBRES DE LA BANQUE :
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AIRTON VIOLIN
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JOAO GUILHERME DE CARVALHO COSTA
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JOSE MARIA DE CARVALHO FILHO
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RONALDO ROSSI
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Data: 4 mars 2022
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Afficher le Résumé
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Aging and obsolescence are factors that occur throughout the Brazilian electrical system, which is why the modernization of substations is inevitable. It is important to highlight that the electrical systems in Europe and in Japan have gone through this process in recent years, and it is inevitably already taking place in the National Interconnected System – NIS. Substations must also be renewed when the network parameters (short circuit current, rated current, voltage, etc.) change. This is due to changes in the transmission network, or when you want to improve the substation's reliability. The adoption of new project assumptions, specially in the electricity sector, faces several barriers in the market, whether due to lack of knowledge of the technology, to public notice requirement or to project standardization. During the circuit breaker technology upgrade process, for example, the design engineers probably encountered the same difficulties. When faced with the need to upgrade the substation or the need to replace equipment, an engineer with little experience will probably specify equipment equal to the existing one, without making a more accurate analysis of the subject, considering a long-term horizon and new technologies. This work aims to propose a methodology for assessing the need and/or the convenience of carrying out the refurbishment of transmission substations (known by the terms: uprating and upgrading), through a case study, highlighting the main points that should be observed by all professionals involved in the project, supporting the expansion and planning of such systems with relevant decisions.
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4
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LUCAS BARROS SCIANNI MORAIS
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Short-Term Load Forecasting Using Artificial Neural Networks
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Leader : JOSE WANDERLEY MARANGON LIMA
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MEMBRES DE LA BANQUE :
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ANDERSON RODRIGO DE QUEIROZ
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EDUARDO CRESTANA GUARDIA
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GIANCARLO AQUILA
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JOSE WANDERLEY MARANGON LIMA
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Data: 4 mars 2022
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Afficher le Résumé
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In electrical power systems, one of the main challenges faced by independent system operators (ISO) is ensuring a reliable balance between energy supply and demand. For this, a proper planning of the system operation is necessary. Short-Term Load Forecasting (PCCP) is essential in this process, as it assists in planning daily operations, including matching demand and supply, setting future electricity prices and defining generation reserves. As smart grid technologies and intermittent renewable energy sources have increased significantly in electricity markets, the task of forecasting the load has increased in complexity and poses a challenge for ISOs. Nonlinear models based on machine learning techniques have become quite popular in recent years, as has the use of hybrid models focused on specific problems. This work focuses on the development of artificial neural network models to solve the PCCP problem, among them the MultiLayer Perceptron (MLP) networks with different numbers of layers and the Long-Short Term Memory (LSTM) and Gated Recurrent Unit (GRU) recurrent networks in its unidirectional and bidirectional versions. In addition to the data provided by ISO, predicted temperature information obtained from the Global Ensemble Forecast System (GEFS) model was used to try to generate more accurate load forecasts. In general terms, the results show that the recurrent models produce greater accuracy and more reliable results than the other models, including the models used by the Brazilian ISO. This is emphasized with the application of the Diebold-Mariano in a paired comparison test between models.
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5
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BERNALIZE DO ROSÁRIO VILA NOVA
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TARIFF REGULATION: APPLICATION OF THE TAROT ECONOMIC MODEL TO OPTIMIZE THE ELECTRIC ENERGY TARIFF PRACTICED IN THE ELECTRICAL SECTOR OF SÃO TOMÉ AND PRÍNCIPE
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Leader : JOSE WANDERLEY MARANGON LIMA
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MEMBRES DE LA BANQUE :
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BENEDITO DONIZETI BONATTO
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EDUARDO CRESTANA GUARDIA
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JOSE WANDERLEY MARANGON LIMA
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LUANA MEDEIROS MARANGON LIMA
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Data: 11 mars 2022
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Afficher le Résumé
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In a monopolistic electricity market, regulation of the electricity sector is essential to avoid overinvestment that does not match the quality of service provided. In this sense, this work aims to evaluate the structure of the electricity sector and the tariff system of São Tomé and Príncipe (STP), and to propose a more efficient methodology of tariff calculation through the economic market model, TAROT (Optimized Tariff), for the determination of a tariff that is capable of promoting the economic and financial balance of the Water and Electricity Company (WEC), and to ensure that the levels of quality of service and the demand for electricity are met, while considering the ability to pay according to the income of consumers. In addition, the impact of the tariff increases on low-income families and WEC was analyzed. It is necessary to create tariff policies that enable the inclusion of these families in the WEC electrical system. In this sense, the tariff should be increased gradually, and it is essential that in addition to it I reflected the operational costs of the company, also ensures that the low-income population has access to electricity at more affordable prices. Finally, an analysis of investment in energy sources was carried out as viable alternatives to complement the current electricity generation system (diesel thermoelectric) in São Tomé and Príncipe. For this, we used the indicators of economic viability analysis: Net Present Value (NPV), Internal Rate of Return (IRR), Minimum Attractiveness Rate (MAR) and discounted Payback. It was found that the insertion of alternative energy sources in the energy matrix together with Energy Efficiency, in addition to contributing to improve efficiency and safety in generation, would also significantly reduce the operational costs that the company has with the import of diesel to generate electricity, in addition to promoting increased competition in the electric market.
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6
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WÉLINGTON BORSATO RODRIGUES
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Analysis of 5G usage in Smart Grids Applications
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Leader : BENEDITO DONIZETI BONATTO
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MEMBRES DE LA BANQUE :
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ALEXANDRE BARATELLA LUGLI
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BENEDITO DONIZETI BONATTO
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DANILO HENRIQUE SPADOTI
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MADSON CORTES DE ALMEIDA
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Data: 23 juin 2022
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Afficher le Résumé
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The Brazilian electrical system has particular characteristics that demand very specific operational requirements and Smart Grids applications. One example is the fact of the system is mostly interconnected, with a large territorial extension and with most of the electric generation being of hydraulic origin, what is a situation that allows the inclusion of water resource monitoring as an Smart Grids application. In addition, other applications are present, such as remote metering, energy management, automation, demand response, vehicular electrification, distributed generation and con-trol of protection systems. One factor that makes these applications viable is the use of communication technologies, which must meet specific requirements for each kind of application. Therefore, a wide range of technologies need to be analyzed carefully and technically for each case, such as WiMAX, NB-IoT, LoRa, Sigfox, Bluetooth, Zigbee, GOES, Wi-Fi, Ingenu, 6LoWPAN, DASH7 and cellular technologies. In this scenario, the telecommunications system in Brazil is constantly being updated and is being prepared to receive the 5G cellular network, which has been analyzed in all the aforementioned applications and is shown to be viable in most of them. In addition, 5G has been widely studied, being one of the most cited wireless communication technologies in scientific publications related to Smart Grids. This scenario shows a great interest of the scientific community of 5G in Smart Grids context.
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7
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LUÍS FELIPE BENATTI
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Integrated Subtransmission Reliability Assessment - Lines and Substations
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Leader : JOSE MARIA DE CARVALHO FILHO
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MEMBRES DE LA BANQUE :
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AIRTON VIOLIN
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JOAO GUILHERME DE CARVALHO COSTA
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JOSE MARIA DE CARVALHO FILHO
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LUCAS RAMALHO DE LIMA
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Data: 30 juin 2022
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Afficher le Résumé
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The purpose of this dissertation is the presentation and application of a method for estimating reliability indicators for energy subtransmission systems, also known as high voltage distribution systems. The methodology must associate the topology of the distribution lines with the substation arrangements, thus being able to determine the reflection of this set on the continuity indicators of the final consumers. The motivation for this study will be given by the peculiarity of the subtransmission system, as they are few redundant, with many cases whose system is radial. This portion of the electrical system is the beginning, in fact, of energy distribution to most customers and has strong interaction with the distribution networks and substations. As are the points of supply of the distribution systems, they have a direct impact on the indicators of continuity of their customers and, consequently, of their own concession.
This work proposes the use of some statistical and physical tools that simulate the operation of energy distribution systems and, consequently, estimate their performance through their regulated indicators. Graph models are presented in 4 operational circumstances: Normal operation; post-maintenance; post-defect and post-maneuver. The methodology proposes the use of linear programming to identify the transition between these states, being the great differential presented in this work, as it allows an intelligent algorithm, associated with the component models presented here, to determine which equipment must be effectively maneuvered to isolate the defect, directing the solution to the lowest possible load shedding.
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8
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YAGO ARAÚJO DOS SANTOS
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Development of a Digital Twin for Fish Transposition System with Virtual Reality Support in Hydro Power Plants
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Leader : LUIZ EDUARDO BORGES DA SILVA
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MEMBRES DE LA BANQUE :
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ERIK LEANDRO BONALDI
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HELCIO FRANCISCO VILLA NOVA
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LUIZ EDUARDO BORGES DA SILVA
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RONDINELI RODRIGUES PEREIRA
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Data: 20 juil. 2022
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Afficher le Résumé
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One of the problems commonly faced by Hydro Power Plants (HHP) is related to the inefficiency of their fish transposition system (FTS). Often, the implemented system is not functioning properly, due to lack of control, monitoring, operational capacity, orderly maintenance procedures and data transparency. If the FTS does not work correctly, the fish, instead of opting for the alternative path offered by the system, end up following water flows that do not result in migration. In this context, the environmental inspection bodies hold the enterprise responsible for the damage caused to the environment and the community, through the application of fines. Some pass through the pipelines of the generating machines, others remain parked on the dam threshold or close to the spillway. Thus, they are held hostage by the operations carried out at the plant, which can promote the mass death of fish. Having presented the problem, the objective of this work is to create a digital twin (DT) supported by virtual reality for a FTS, aiming at the general optimization of the structure. In this way, it will be possible to control the real structure through a computational model that faithfully represents the physical system. The implemented DT consists of four main tools: 2D supervisory, 3D supervisory, maintenance management system and a mobile application. Each tool has a specific function and was created to make up the needs of operation, monitoring and maintenance. In addition, the set assists in the construction of operating histories, which contribute to the transparency and presentation of data.
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9
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DANIEL DE ALMEIDA ARANTES
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System for Simultaneous Determination of Flow Rate and Water Content in Fuel Oils
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Leader : LUIZ EDUARDO BORGES DA SILVA
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MEMBRES DE LA BANQUE :
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CARLOS EDUARDO TEIXEIRA
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GISCARD FRANCIMEIRE CINTRA VELOSO
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LEVY ELI DE LACERDA DE OLIVEIRA
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LUIZ EDUARDO BORGES DA SILVA
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RONDINELI RODRIGUES PEREIRA
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Data: 22 juil. 2022
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Afficher le Résumé
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The use of fuel oils for energy generation in thermoelectric plants makes an important contribution to the Brazilian power grid, especially during periods of lower water abundance. The fuel oil used by some power plants is a by-product of petroleum refining, and may contain contaminants that are harmful to the machinery when present in considerable amounts. In this context, the present work brings the development of a system for online monitoring of the processes of supplying thermoelectric power plants with heavy fuel oil. This system allows the visualization of the flow rate and the amount of water contained in oil, since this is one of the main contaminants that can be found in this type of fuel. Its application aims to provide the plant with more detailed knowledge about the purchased fuel, as well as allowing the interruption of supply operations in the event of an irregular product. For the implementation of the system, a multi-path ultrasonic method for flow measurement is used, as well as a capacitive method for identifying the water content. This work presents the development of electronic circuits for performing the proposed measurements, including an innovative circuit for measuring capacitance through an oscillating current source. The individual elements of the system are tested and calibrated, ultimately leading to the assembly and installation of a working prototype in a thermoelectric power plant.
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10
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MARCELLA BARBOSA BRANDÃO DA SILVA CAMPBELL
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Energy dispatch using DESSEM and coupling with operational reality
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Leader : JOSE WANDERLEY MARANGON LIMA
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MEMBRES DE LA BANQUE :
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ANDERSON RODRIGO DE QUEIROZ
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BENEDITO CLAUDIO DA SILVA
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JOSE WANDERLEY MARANGON LIMA
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Data: 22 juil. 2022
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Afficher le Résumé
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In January 2020, the National Power System Operator started using the DESSEM program. It is a model developed by CEPEL and aims to determine the daily energy dispatch for the operation of hydrothermal systems, including intermittent sources, with discretization of up to half an hour. This model works in coordination with the DECOMP and NEWAVE models, which are medium and long-term models for determining the dispatch and the hourly energy price for the following day. This work presents a brief history of the Brazilian electricity sector, the way in which the country's electro-energy operation is managed and the old and current model of daily energy dispatch are explained, in addition to the methodology of operation of the post-DESSEM and its repercussions. The objective is to understand and evaluate the interactions between the agents and the ONS with the use of DESSEM as a very short-term model and the deviations observed between the model generation proposals and those that are finalized in the programming stage. The work focuses on the most important plants of the Furnas system, used as a case study. In addition, in order to highlight the difference between the operating policies adopted by the model and those by the ONS, a quantitative analysis was proposed in this work, with the purpose of identifying a possible seasonal variation in order to gain greater sensitivity on the results of the energy operation.
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11
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AMANDA PEREIRA CHIARADIA
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PRIMARY CONTROL OF MICROGRIDS IN ISLANDING OPERATING CONDITIONS WITH INSERTION OF ELECTRIC VEHICLES
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Leader : ANTONIO CARLOS ZAMBRONI DE SOUZA
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MEMBRES DE LA BANQUE :
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ANTONIO CARLOS ZAMBRONI DE SOUZA
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BRUNO de NADAI NASCIMENTO
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CLAUDIA ELIANE DA MATTA
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MAURICIO CAMPOS PASSARO
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Data: 22 août 2022
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Afficher le Résumé
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With each passing year the electrical system has evolved substantially. This is due to the increase in the inclusion of renewable sources in the network, which includes the concept of smart grids. Microgrids can operate isolated or connected to the main network and are a great alternative to ensure quality and reliability in the supply of electricity. In this dissertation, special attention is given to microgrids with islanding problems regarding demand variation, and the concept of electric vehicles connected to the grid. Electric vehicles are used as energy storage to supply energy within the stipulated limits and analyze whether there is a need for their use at the time of islanding. Also, in cases of a non-tolerable operating point, the primary control of frequency and voltage is used to correct the operation of the system. The results presented here are based on the IEEE 37-Nodes Test Feeder system, which to make it equivalent to a microgrid, some modifications were made. In this system, it is possible to change the network charge curves, including electric vehicles, number of EVs to be charged and their respective batteries. With this, it is expected that the tools used here will be able to analyze and manage the system when there are islanding situations.
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12
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NATÁLIA VILAS BÔAS PAPPI MACIEL
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Modelling and Simulation of Critical Infrastructures in Smart Cities
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Leader : BENEDITO DONIZETI BONATTO
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MEMBRES DE LA BANQUE :
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ANTONIO CARLOS ZAMBRONI DE SOUZA
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BENEDITO DONIZETI BONATTO
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JOSÉ RAMON MARTÍ
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LUIZ CARLOS PEREIRA DA SILVA
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Data: 22 août 2022
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Afficher le Résumé
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Along with the development of society, productivity rates increase, causing the needs of the people to change. As a result, new technologies rise to fulfill the stability of the system and maintain the developing trend. This fact leads to the growth in the complexity of cities affecting their vulnerability and sustainability. The study and modeling of the interdependent relationships among cities´ critical infrastructures can provide not only optimal action plans for extreme events scenarios but also provide effective and strategic long-term planning to optimize the system towards the desired goal, which is the case of this research. This work provides a reliable model of the systems in a developing city that aims to represent the interdependent relationships in it, along with its variables, inputs, outputs, and possible modifiers. This plan will hopefully pave the way for the economic and energetic development of the city towards making it a smarter city and also showing that it is possible to make smart the existing, not planned, developing cities.
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13
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RENATA DE ALMEIDA RIBEIRO
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Statistical Properties of PMU Signals - Phasor Measurement Unit
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Leader : ROBSON CELSO PIRES
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MEMBRES DE LA BANQUE :
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CAMILA PAES SALOMON
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ILDEMAR CASSANA DECKER
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MARCOS NETTO
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ROBSON CELSO PIRES
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Data: 26 août 2022
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Afficher le Résumé
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This master’s thesis studies the statistical properties of voltage, current, and complex power measurements provided by phasor measurement units (PMUs). We use PMU mea- surements installed in an extra-high voltage transmission system, specifically the net- work operated by Companhia de Transmissão de Energia Elétrica Paulista (CTEEP), a transmission system operator in Brazil. Further, we also conduct an analysis using PMU measurements installed in low-voltage distribution systems, notably PMUs installed on University campuses across Brazil funded by the MedFasee project. Our analysis relies on the methodology recommended by the technical literature in signal processing. We pay particular attention to the fact that the standard deviation of errors associated with measurements expressed in rectangular coordinates decisively impacts the performance of bad-data processing algorithms. Hence, we evaluate the performance of bad-data process- ing algorithms formulated in the complex plane. We perform this evaluation on two state estimators based on the weighted least squares (WLS) method. The first state estimator follows the classical formulation and only uses measurements from the supervisory con- trol and data acquisition (SCADA) system. The second state estimator relies on a hybrid formulation, which allows us to use SCADA and PMU measurements. Key-words: Measures expressed in rectangular coordinates, PMU, hybrid state estima- tors.
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14
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ALINE AIRES TEIXEIRA
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Controller Fuzzy Type 2 with Programming in Verilog of the Functions Membership
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Leader : GABRIEL ANTONIO FANELLI DE SOUZA
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MEMBRES DE LA BANQUE :
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GABRIEL ANTONIO FANELLI DE SOUZA
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ROBSON LUIZ MORENO
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TALES CLEBER PIMENTA
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THIAGO POUZA MUSSOLINI
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Data: 29 août 2022
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Afficher le Résumé
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The fuzzy type-2 fuzzy inference system presents a superior performance in relation to other methods for applications in systems with uncertainty. This work presents the architecture of a SIF type-2 that aims to use the trapezoidal membership function that ensures faster and simpler circuits. The architecture implemented in FPGA consists of five blocks, fuzzifier, inference, rule base, type-reductor and defuzzifier. The hardware presented consists of two 8-bit inputs with three trapezoidal membership functions for each input, nine rules and an 8-bit output with three membership functions. The Verilog implementation results are compared with the same architecture implemented in Matlab® using the Toolbox for type-2 fuzzy.
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15
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EDSON FERNANDO MACHADO SATO
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Arc Flash and Incident Energy in Industrial Power Systems
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Leader : JOSE MARIA DE CARVALHO FILHO
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MEMBRES DE LA BANQUE :
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JOSE MARIA DE CARVALHO FILHO
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LUIS HENRIQUE LOPES LIMA
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PAULO MARCIO DA SILVEIRA
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Data: 11 oct. 2022
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Afficher le Résumé
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Although the massive use of electricity in industry began at the end of the 19th century, the first electric arc thermal effects estimating method was only proposed in the 1980s. In the following decades, several works contributed to increase the knowledge about the phenomenon and to improve the methods to quantify it. The IEEE Std 1584 first edition was published in 2002, being the first incident energy calculation dedicated technical standard. This standard, which has become the industry most popular method, had its second edition published at the end of 2018, with significant changes. A new mathematical model was proposed, including parameters that were not measured before, in addition to long equations, which manual calculation may be considered impractical. In this context, this work presents an IEEE Std 1584-2018 method incident energy calculation script development and its application in two case studies. The first case study illustrates the parameter evaluation to carry out a low voltage controlgear incident energy study, ending with a comparison between the 2018 Edition results with those of the 2002 Edition. The second case study proposes a roadmap for carrying out an incident energy dynamic study that considers multiple sources and the rotating machines short-circuit contribution ac decrement, concluding with a comparison between the results considering the ac decrement with the results in which it is neglected, and a discussion of the situations in which the effort to carry out a dynamic study can be justified.
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16
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UCHENNA GODSWILL ONU
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Integrated Design of Photovoltaic Power Generation Plant with Pumped Hydro Storage System and Agricultural Facilities in Uhuelem-Amoncha African Community
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Leader : ANTONIO CARLOS ZAMBRONI DE SOUZA
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MEMBRES DE LA BANQUE :
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ANTONIO CARLOS ZAMBRONI DE SOUZA
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BENEDITO DONIZETI BONATTO
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ELIANE VALENCA NASCIMENTO DE LORENCI
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MIGUEL CASTILLA
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Data: 26 oct. 2022
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Afficher le Résumé
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Seasonal and location dependence of renewable energy resources have limited their applications in power generation. Energy storage systems are promising solutions to the intermittence of renewable energy resources. Rural electricity grids are faced with economic sustainability challenges due to low power demand and poverty. As countries hopefully pass through various stages of development, their needs change. The electricity needs of developing countries surely differ from those of developed economies. Most of the global population without access to electricity, and all the consequences of it, is found in developing countries. Energy access is undoubtedly a significant catalyst for development. Developed countries mainly require technologies to ensure energy security, resilience, and occasionally emission control. Therefore, microgrids are emerging technologies capable of supporting the diverse needs of various stages of development. For example, a rural grid design around economic drivers like agriculture and micro industries can mitigate poverty and improve economic sustainability of rural grids. This study presents an Integrated Design of Photovoltaic Power Generation Plant with Pumped Hydro Storage System and Agricultural Facilities in Uhuelem-Amoncha African Community. The design explored the natural availability of water body in an elevated settlement area that offers a natural storage height for hydro energy storage. HOMER (Hybrid Optimization of Multiple Energy Resources) software was deployed to optimize the design. The designed photovoltaic power generation plant has a nominal capacity of 221 kW. The simulated results show the power supply probability of the plant as 99.9%. The cost of energy (COE) offered by the design is 0.456 [US$/kWh] which is 82% lower than the current cost of energy in the project community based on generation through petrol generators. The System has 100% renewable energy penetration. The plant is designed to power 50 households with a daily domestic energy consumption of 4.46 [kWh] each. The plant capacity also covers the irrigation water requirement of 50 acres of corn farms. A total of 100 units of designed intelligent pest control system will also be powered by the plant. A community refrigeration scheme of 27 [m3] equivalent volume is part of the plant design load. The benefits from the irrigation, water supply, pest control and refrigeration scheme will enhance the community’s socio-economic development and sustain the investment. Quantifying the integral socio-economic and environmental benefits is a subject of a future research.
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17
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MATEUS GOMES DE SIQUEIRA E SALLES
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Feasibility analysis of application of energy sustainability solutions on the Unifei campus
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Leader : BENEDITO DONIZETI BONATTO
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MEMBRES DE LA BANQUE :
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BENEDITO DONIZETI BONATTO
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JOSE WANDERLEY MARANGON LIMA
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TIAGO RODARTE RICCIARDI
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VICTOR EDUARDO DE MELLO VALERIO
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Data: 25 nov. 2022
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Afficher le Résumé
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The development of new technologies and maturing of rules, norms and laws refer-ring to the electricity sector have been in constant evolution since the beginning of its conception. Over the years, the emergence of new energy solutions, as well as improvements in the power sector regulation, have provided the system's growth in a sustainable way. In this context, when considering the possible energy solutions and optimizations, this dissertation seeks to explore the options for electricity con-sumption at the Federal University of Itajubá - UNIFEI, to present the most sustain-able model and that seeks to better apply the power and market solutions. The cas-es evaluated will verify the use of Photovoltaic Solar Generation and/or Energy Storage, as well as the transition between the Regulated Contracting Environment - ACR and the Free Contracting Environment - ACL.
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18
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OSCAR MANUEL TORRES LARROSA
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VOLTAGE STABILITY ANALYSIS IN POWER SYSTEMS, CONSIDERING THE INSERTION OF RENEWABLE SOURCES
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Leader : GABRIEL ANTONIO FANELLI DE SOUZA
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MEMBRES DE LA BANQUE :
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ANTONIO CARLOS ZAMBRONI DE SOUZA
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DIOGO MARUJO
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ELIANE VALENCA NASCIMENTO DE LORENCI
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RENAN SOUZA MOURA
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Data: 8 déc. 2022
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Afficher le Résumé
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This work presents the development of a methodology that allows identifying the reliable penetration levels of non-conventional renewable generation, such as the case of photovoltaic generation to the Transmission System of Paraguay. To achieve this, a methodology is developed for the quantification of current stability margins, the recognition of critical areas of the system, and the identification of candidate buses for possible reinforcements of the system, such as the insertion of photovoltaic solar generation, and thus, obtaining an evaluation of the technical performance of the system. For this reason, some classic voltage stability tools are applied, such as the Load Margin (MC), obtained through the PV curves and the Tangent Vector (VT). Likewise, this methodology allows obtaining the positive impacts of a greater photovoltaic penetration, such as a significant increase in the MC, as well as eventual negative effects considering the decrease in the rotational inertia of the system. On the other hand, the work also includes an investigation about the social effects of the insertion of large generation works in isolated regions of the analyzed system, where results indicate that access to electricity in isolated and vulnerable communities contributes enormously to facilitate the economic and social integration of the population, leaning towards tangible sustainable development. Finally, as a conclusion, the methodology for the proposed analysis is valid, and up to 15% of photovoltaic generation can be safely installed in the Paraguayan System
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19
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HUGO OLIVEIRA VILAS BOAS
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Application of a 24-pulse AC-DC converter as Workaround for Power Quality Improvement within the Context of Aircraft Electrical Systems
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Leader : GABRIEL ANTONIO FANELLI DE SOUZA
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MEMBRES DE LA BANQUE :
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ADRIANA APARECIDA DOS SANTOS IZIDORO
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CHRISTEL ENOCK GHISLAIN OGOULOLA
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GABRIEL ANTONIO FANELLI DE SOUZA
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ROBSON BAUWELZ GONZATTI
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Data: 12 déc. 2022
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Afficher le Résumé
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This work, with the objective of improving the quality of electric power (QEE) in MEA (More Electric Aircraft) distribution systems operating with variable frequency (360 – 800 Hz), addresses an application of a 24-pulse converter system (SC- 24P), previously developed by the research group for use in HVDC (High Voltage Direct Current) transmission systems. Usually, the converter systems used in MEA systems, for AC–DC conversion, are of the 12-pulse type (SC-12P). However, this type of converter technically does not meet harmonic distortion standards for MEA applications and therefore must be used in conjunction with AC and DC filters. In addition, the weight and volume occupied by the filters clearly bring some disadvantages to modern MEA systems. In order to overcome the disadvantages offered by the traditional system, this dissertation proposes the use of the SC-24P to reduce the filters used in conventional MEA systems and to improve the power quality of the system as a whole. Theoretical analyzes of the SC-24P, regarding the profiles and harmonic content of the AC currents and DC voltages for both converters, are briefly described through established equations, which made it possible to partially prove the research conducted in this dissertation. The calculations processed through the theoretical analyzes are done using the MathCad program. The advantages and performance of the employed SC24P compared to the traditional SC-12P are exposed via computational simulations carried out in the Matlab/Simulink environment. The results obtained from the SC-24P in terms of %THD (< 3%) of AC current, DC voltage ripple amplitude and other QEE indices, for the 360 Hz and 800 Hz frequencies, meet the RTCA-Aeronautical Standards. DO-160F and MIL-STD-704F, respectively. On the other hand, with the lack of laboratory resources regarding the availability of a power supply for the level of operational frequencies treated in simulations, a reduced-scale prototype was implemented using the power supply network at 60 Hz. The results meet the requirements of IEEE 519 and prove the application of the converter used only in industrial electrical systems, for driving rotating electrical machines. The synthesis of the results treated and discussed in this work confirms the applicability of the SC-24P in MEA systems and demonstrates a promising research to be explored for future developments.
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20
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GUILHERME FERREIRA DA MATA
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CRITICAL ANALYSIS OF THE EVOLUTION OF THE REGULATORY REMUNERATION BASE OF ELECTRICITY UTILITIES IN THE COUNTRY AND PROPOSAL FOR AN INTEGRATED FRAMEWORK FOR REGULATED ASSET MANAGEMENT
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Leader : BENEDITO DONIZETI BONATTO
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MEMBRES DE LA BANQUE :
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BENEDITO DONIZETI BONATTO
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FERNANDA CASENO TRINDADE ARIOLI
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GIANCARLO AQUILA
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JOAO GUILHERME DE CARVALHO COSTA
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Data: 14 déc. 2022
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Afficher le Résumé
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The Brazilian electricity sector is going through a revolution in face of modernization challenges, needs for investments in smart grids, insertion of new technologies and distributed energy resources. In this context, it is relevant to discuss the mechanisms to stimulate the efficiency of the investments made by the Electricity Distribution Companies (DisCos), as well as the formulation of practices and concepts (a framework) that help companies in the electricity sector to act. According to a regulatory strategy, capturing the incentives allowed, complying with regulatory requirements and seeking to maximize the benefits for the entire Brazilian society, providing transparency and lower tariff, since the costs of energy distribution activities are directly related to the management of the company's assets. Thus, when it comes to regulatory asset management, there are several complex challenges to be solved or optimized. On one hand, the regulated companies' focus is to increase their remuneration base through investments in the network according to the concession, contracts, and on the other hand, the regulator's focus is to ensure that only prudent investments are remunerated and to guarantee reasonable tariffs. This scenario is challenging for both sides. Despite the maturity and conceptual evolution of the existing methodologies for asset management, the daily practice in concessionaires, especially energy distributors, struggles against a variety of approaches to traditional practices and, mainly, with the lack of an integrated approach that takes into account the complexity of the regulatory environment, and it is essential for these concessionaires to meet and understand this environment. One of the main contributions of this work is the formulation of an integrated regulatory asset management framework for distribution companies. Based on regulatory requirements, the investment remuneration mechanism and practices adopted by Brazilian distributors, the proposed framework unifies practices and presents concepts and standards that must be adopted considering the regulatory perspective in the management of their remuneration base.
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21
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MIGUEL MARQUES DE PAIVA ESPER
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Service of reconfiguration to IoT devices.
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Leader : DANILO HENRIQUE SPADOTI
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MEMBRES DE LA BANQUE :
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DANILO HENRIQUE SPADOTI
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EDVARD MARTINS DE OLIVEIRA
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GABRIEL LOBÃO VASCONCELOS FRÉ
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REINALDO LIMA DE ABREU
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Data: 14 déc. 2022
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Afficher le Résumé
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This work presents an optimization model for sending telemetry from IoT devices, using the Twin Device tool present in Microsoft’s cloud server services platform, called Azure. The optimization is done through a server, developed in Python, which interprets the telemetry received, defines the current state of the device and updates the settings of the device and emits it through Twin Device. The result in normal operating states was a drastic decrease in the number of packets and consequently a smaller volume of data trafficked on the network, already in a critical state, the amount of packets increased and consequently a considerably greater volume trafficked through the network.
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22
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RAFAEL MAGLIONE AOUN
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Evaluation of DER's control strategies impact on the dynamic response of power systems
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Leader : ANTONIO CARLOS ZAMBRONI DE SOUZA
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MEMBRES DE LA BANQUE :
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ANTONIO CARLOS ZAMBRONI DE SOUZA
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BRUNO de NADAI NASCIMENTO
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LUIZ CLAUDIO DE ARAUJO FERREIRA
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MAURICIO CAMPOS PASSARO
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PAULO FERNANDO RIBEIRO
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Data: 14 déc. 2022
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Afficher le Résumé
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Load modeling in power systems is a crucial aspect for stability studies. The analysis of certain dynamic phenomena requires proper load modeling. Fault Induced Delayed Voltage Recovery (FIDVR) is directly related to Residential Air Conditioner (RAC) stalling. Therefore, the modeling of induction motor loads is essential to this analysis. Delayed voltage recovery in the system can result in delayed power recovery in inverters connected to the transmission system, responsible for connecting photovoltaic and wind power plants to the Brazilian Interconnected Power System (BIPS). In the last few years, there has been a huge growth of Distributed Energy Resources (DER) in Brazil. In power systems around the world, both modern and legacy ride-through settings coexist. Inverters with legacy settings are more likely to disconnect in systemic events. The modeling of induction motors in the Acre-Rondonia system leads to a deterioration of this system’s dynamic performance, which can lead to collapse. DER’s voltage support can contribute to post-fault system voltage recovery, mitigating the delay caused by RAC stalling and avoiding collapse. For this to happen, more robust ride-through settings are required, avoiding inverter disconnection. Moreover, dynamic voltage support and reactive current priority requirements must be demanded from inverters that connect to the system.
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23
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ANDRÉ SOARES DA SILVA
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Solution of the Power Flow Problem in the Complex Plane Via Conjugate Gradient Methods
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Leader : ROBSON CELSO PIRES
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MEMBRES DE LA BANQUE :
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FABRICIO SILVEIRA CHAVES
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ILDEMAR CASSANA DECKER
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ROBSON CELSO PIRES
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Data: 16 déc. 2022
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Afficher le Résumé
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The technical literature in numerical analysis offers several alternatives of iterative methods for the solution of nonlinear optimization problems applied to the energy industry. However, when it comes to iterative methods applied to nonlinear power flow, the Newton-Raphson iterative method and its variations are practically unanimity. The work proposal of this master's thesis aims to investigate the performance of nonlinear Complex Bi-Conjugate Gradient Methods (CBiCG) in their application to power flow problems, in comparison with the classical formulation, using the Newton- Raphson in polar coordinates in the domain of real numbers. These methods, however, were implemented in the complex domain through the use of the Generalized Wirtinger calculus and the extension of Taylor series to the complex domain. The main motivations for this approach are that the conjugate gradient methods are first order and do not require factoring the Jacobian matrix as is done in the traditional Newton-Raphson method, thus reducing the computational effort required to obtain the solution. In addition, in view of the current computational complexity, there has been a tendency for processor architecture to incorporate SIMD (Single Instruction, Multiple Data), which refers to a set of operations for efficiently handling a large amount of data in parallel, using a vector or matrix processor, suitable for the algebra of complex numbers.
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Thèses |
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1
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EMERSON ASSIS DE CARVALHO
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Estimating the Family Bias to Autism: A Bayesian Approach
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Leader : GUILHERME SOUSA BASTOS
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MEMBRES DE LA BANQUE :
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ROBERTO HIROCHI HERAI
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EDMILSON MARMO MOREIRA
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GUILHERME SOUSA BASTOS
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JOAO PAULO REUS RODRIGUES LEITE
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LUCELMO LACERDA DE BRITO
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RICARDO ZORZETTO NICOLIELLO VENCIO
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Data: 21 févr. 2022
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Afficher le Résumé
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Autism is an age- and sex-related lifelong neurodevelopmental condition characterized primarily by persistent deficits in core domains such as social communication. It is estimated that ≈ 2% of children have some ASD trait. The autism etiology is mainly due to inherited genetic factors (>80%). The importance of early diagnosis and interventions motivated several studies involving groups at high risk for ASD, those with a greater predisposition to the disorder. Such studies are characterized by evaluating some characteristics of the individual itself or the family members of diagnosed individuals, mainly aiming to predict a future diagnosis or recurrence rates. One of the primary goals of Artificial Intelligence is to create artificial agents capable of intelligent behaviors, such as prediction problems. Prediction problems usually involve reasoning with uncertainty due to some information deficiency, in which the data may be imprecise or incorrect. Such solutions may seek the application of probabilistic methods to construct inference models. In this thesis, we will discuss the development of probabilistic networks capable of estimating the risk of autism among the family members given some evidence (e.g., other family members with ASD). In particular, the main novel contributions of this thesis are as follows: the proposal of some estimates regarding parents with ASD generating children with ASD; the highlighting regarding the decrease in the ASD prevalence sex ratio among males and females when genetic factors are taken into account; the corroboration and quantification of past evidence that the clustering of ASD in families is primarily due to genetic factors; the computation of some estimates regarding the risk of ASD for parents, grandparents, and siblings; an estimate regarding the number of ASD cases in a family sufficient to attribute the ASD occurrences to the genetic inheritance; the assessment of some estimates for males and females individuals given evidence in grandparents, aunts-or-uncles, nieces-or-nephews and cousins; and the proposition of some estimates indicating risk ranges for ASD by genetic similarity.
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2
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ANDRE BERNARDI
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ESTIMAÇÃO DA PROPORÇÃO DE ÁGUA NO ETANOL COMBUSTÍVEL ATRAVÉS DA ANÁLISE DA ASSINATURA ACÚSTICA EM SINAIS ULTRASSÔNICOS
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Leader : LUIZ EDUARDO BORGES DA SILVA
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MEMBRES DE LA BANQUE :
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CARLOS EDUARDO TEIXEIRA
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ERIK LEANDRO BONALDI
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GISCARD FRANCIMEIRE CINTRA VELOSO
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ISMAEL NORONHA
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LUIZ EDUARDO BORGES DA SILVA
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ROBSON BAUWELZ GONZATTI
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RONDINELI RODRIGUES PEREIRA
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Data: 4 mars 2022
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Afficher le Résumé
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The end of price controls on fuels led to an increase in competitiveness between distribution companies and resellers, which aggravated the practice of adulteration of fuels, thereby aiming at illicit gains and tax evasion. The most common adulteration of ethanol is accomplished by adding water, which is the simplest practice of adulteration. Karl Fischer's technique is one of the most reliable to measure the water content in ethanol and is recommended by the National Agency of Petroleum, Natural Gas and Biofuels (ANP), a regulatory agent, to assess the water levels present in ethanol. Although this approach offers good precision and good detail regarding the presence of water, it has disadvantages such as the need for sample collection, long analysis time, in addition to the need for specialized laboratory and labor. The ultrasonic technique can detect moisture in ethanol, either invasively, through samples, or non-invasively, obtained directly from the walls of a pipe filled with liquid. Based on this information, the present work aims to propose digital signal processing techniques to analyze and quantify the presence of moisture in ethanol samples through the manipulation of ultrasonic signals that had contact with the mixture in the liquid phase and had their characteristics altered by the presence of water. To identify and quantify water levels in the ethanol-water mixture, a combination of the Principal Component Analysis (PCA) and Singular Spectrum Analysis (SSA) techniques is used. This methodology resulted in the proposition of a new score, which relates to the information of the ethanol / water ratio present in the mixture, allowing the application of the technique to analyze this information in a non-invasive way, and in a wider range . This thesis presents a non-invasive methodology to characterize, quantify and classify the presence of moisture in fuel ethanol. The results found were promising when relating the proposed score to the presence of moisture in ethanol to a greater or lesser degree. Experiments performed demonstrate the feasibility of the technique and pave the way for a new methodology for monitoring totally non-invasive conditions.
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3
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GIULIA OLIVEIRA SANTOS MEDEIROS
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Efficiency analysis for the Brazilian electric utilities
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Leader : JOSE WANDERLEY MARANGON LIMA
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MEMBRES DE LA BANQUE :
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ANDERSON PAULO DE PAIVA
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JOSE WANDERLEY MARANGON LIMA
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JOSÉ FRANCISCO MOREIRA PESSANHA
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LUANA MEDEIROS MARANGON LIMA
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PAULO ROTELLA JUNIOR
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Data: 25 mars 2022
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Afficher le Résumé
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The electricity distribution sector in Brazil has the characteristic of a natural monopoly and needs economic regulation. The mechanism adopted for tariff regulation is the Periodic Tariff Review (RTP), carried out by the National Regulatory Agency. Currently, the efficiency analysis method applied at RTP is the Data Envelopment Analysis (DEA), already used by other countries in the evaluation of efficiency in energy utilities. Utilities classified as inefficient by the DEA must direct their efforts to win efficiency by looking at practices from the utilities classified by efficient by the DEA. This study proposes an efficiency analysis focused on improving the current methodology at RTP and suggests tools that may be useful in providing strategies to improve efficiency. The analyzes presented here focus on two levels: sectorial and corporate. At the sectorial level, an efficiency analysis is proposed, in which each utility is considered as a Decision-Making Unit (DMU) in the DEA and compared with each other. This efficiency analysis between utilities delimited the database defined by the regulator. The study also applies the concept of 'clustering' the set of DMUs by the k-means method, showing the effect that a reduction of DMUs` set causes in the efficiency analysis. Finally, the impact of DEA efficiency is measured quantitatively on the utilities' regulatory operating costs (COR). At the corporate level, an innovative internal benchmarking is proposed, named here self-efficiency analysis. This analysis splits the utility into smaller parts (regional), and these parts are considered the DMUs in the DEA. The idea of splitting the concession area into smaller areas is to incorporate the effect of environmental characteristics (such as lightning incidence and vegetation height) in the efficiency analysis. The thesis presents a case study for a utility in São Paulo. The self-efficiency analysis, therefore, defines efficiency gain strategy by indicating the most inefficient areas inside the utility. The study also applies two other benchmarking techniques, the Cross-efficiency Analysis and the Ratio-based Efficiency Analysis. The CEA and REA studies bring new efficiency indicators for efficiency analysis between utilities and self-efficiency analysis.
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4
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MATHEUS SÊDA BORSATO CUNHA
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5G NR Optical-Wireless System with a Multi-Wavelength Transmitter in Integrated Optics
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Leader : DANILO HENRIQUE SPADOTI
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MEMBRES DE LA BANQUE :
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EVANDRO CONFORTI
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ARISMAR CERQUEIRA SODRÉ JUNIOR
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DANILO HENRIQUE SPADOTI
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JOSE ANTONIO JUSTINO RIBEIRO
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MATEUS AUGUSTO FAUSTINO CHAIB JUNQUEIRA
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ROBERTO SHIGUERU NOBUYASU JUNIOR
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Data: 29 mars 2022
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Afficher le Résumé
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This work addresses a solution for the implementation of radio over fiber (RoF - radio-over-fiber) systems for applications in fifth-generation (5G) wireless networks and future generations. The proposed solution is demonstrated with the application of a multiwavelength transmitter (MWT – multiwavelength transmitter) integrated into an indium phosphide platform (InP – indium phosphide), as a source for generating optical carriers. First, the photonic integrated circuit (PIC) and characterization of the MWT are presented. The PIC integrates eight tunable wavelength lasers, aiming to reduce the complexity and dimensions of the transmitter, allowing for compact, high-performance, and smaller 5G solution cost. After the characterization, a multi-band 5G optical fronthaul is implemented using two 5G new radio (NR) signals and one LTE-A signal. The signals are evaluated in two distinct scenarios, as a function of the root mean square error vector magnitude (EVMRMS), according to the requirements of 3GPP Release 15. In the first phase, three optical carriers in C-band are independently modulated with three mentioned RF signals featuring wavelength division multiplexing, whereas subcarrier multiplexing is applied to the second scenario to jointly modulate the three RF signals into a single optical carrier. Gbit/s throughput is demonstrated to validate the applicability of the integrated MWT to allow multiple applications and/or diverse RF standards. The PIC transmitter is implemented in wireless optical communication systems. The first implementation refers to a system based on the convergence between optical networks and RF networks, called fiber-wireless (FiWi) system. In this system, three RF signals, in 4G/5G standards, are simultaneously transported over a 12.5 km long RoF link. RF transmissions in the wireless medium are demonstrated using a 10 m long indoor picocell-like link and a 115-m long realistic outdoor link. The second proposal presents a 12.5 km RoF system followed by a 1.5 m free space optics (FSO) link, targeting the end-user access network. In this proof of concept, an M QAM signal is transmitted on only one MWT channel. The received signals in both implementations comply with the requirements of 3GPP Release 15, in terms of EVMRMS, and show a total throughput of 1.36 Gbit/s and 230 Mbit/s in the scenarios of 10 m and 115 m, respectively, and a throughput of 160 Mbit/s for the link in FSO.
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5
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CÉSAR WILLIAM VERA CASAÑAS
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A biasing technique for a CMOS current comparator
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Leader : ROBSON LUIZ MORENO
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MEMBRES DE LA BANQUE :
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DALTON MARTINI COLOMBO
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GUSTAVO DELLA COLLETTA
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LEONARDO BRESEGHELLO ZOCCAL
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OSAMU SAOTOME
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PALOMA MARIA SILVA ROCHA RIZOL
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ROBSON LUIZ MORENO
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Data: 14 avr. 2022
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Afficher le Résumé
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In this work a technique to bias a CMOS current comparator is presented. The current comparator circuit uses the flipped voltage follower (FVF) block as input stage, and a cascode structure is proposed to bias properly this stage. Alternatives to bias the input block are presented, demonstrating the trade-off between the response time and the input impedance of the circuit. The circuit was developed using the CMOS technology of the Taiwan Semiconductor Manufacturing Company (TSMC) 0.18 µm process. The postlayout simulation results show that the current comparator, with the proposed structure to bias the input stage, exhibits a propagation time of 7.5 ns with a power consumption of 47 µW when the input is a pulsed current amplitude ±2 µA with a frequency of 50 MHz. The input impedance value is 50 Ω at the operating frequency. The minimum current, at low frequencies, that the circuit can detect is 200 pA. The cascode structure, proposed to bias the FVF block, provides a voltage value of 1.01 V with a coefficient of variation of ±0.001%. The results of the characterization of the manufactured prototype confirm that the current comparator, with the proposed technique to bias the input circuit, is appropriate and functional.
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6
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VERONICA ETCHEBEHERE SANTIAGO
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Locational Tariff Structure for Radial Network Fixed Costs in a DER Context
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Leader : JOSE WANDERLEY MARANGON LIMA
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MEMBRES DE LA BANQUE :
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DELBERIS ARAUJO LIMA
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DOREL SOARES RAMOS
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EDUARDO CRESTANA GUARDIA
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JOSE WANDERLEY MARANGON LIMA
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LUANA MEDEIROS MARANGON LIMA
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Data: 19 mai 2022
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Afficher le Résumé
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The regulation of Distributed Energy Resources (DERs) has cast doubt on the sustainability of utility business models. The impact of net-metering, and network charge rebates for distributed generation (DG) have been questioned because of the cross-subsidies that result between passive consumers and DG investors. Besides DG investors, other new entrants such as owners of energy storage resources and electrical vehicles are creating challenges for the regulation of distribution service pricing. This work addresses the debate by comparing several different distribution network pricing models from the literature. It suggests modifications to these methodologies to adapt them as we transition from a distribution sector comprising passive users to one in which users are active agents. It considers the design principles governing each tariff, from the perspective of simplicity, economic signalling, and revenue reconciliation. Results are presented of simulations performed with different arrangements of alternative energy generators and energy stores, using an actual feeder from a distribution company in Brazil. An analysis of these results is provided that suggests a combination of locational and time-of-use rates can provide effective economic signals to these new types of system user.
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7
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BRUNO SILVA TORRES
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Multi-Agent System for Self-Healing to Smart Grids
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Leader : LUIZ EDUARDO BORGES DA SILVA
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MEMBRES DE LA BANQUE :
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ALEXANDRE RASI AOKI
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CAMILA PAES SALOMON
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CARLOS HENRIQUE VALERIO DE MORAES
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CLAUDIO INACIO DE ALMEIDA COSTA
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LUIZ EDUARDO BORGES DA SILVA
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RONALDO ROSSI
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Data: 19 mai 2022
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Afficher le Résumé
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Electricity distribution systems represent the final link between energy-generating companies and consumers. Having radial characteristics, they have lower reliability, so a failure in some components causes the interruption of the power supply. Even with the development of new technologies to improve the operation and maintenance of these systems, losses and interruptions are inevitable. When the power supply is out of the supply due to a failure, the system must be re-established to meet the largest number of loads safely and in the shortest possible time interval. The current distribution network is at a stage of development known as the smart grid, using advances in information and communication technologies. This thesis presents a contribution to implementing self-healing strategies of distribution systems in a decentralized way, which brings as main advantages the good cost-benefit ratio, the improvement in reliability, and the possibility of incremental expansion of the system. The proposed system is based on an intelligent multiagent structure, in which each agent has a logical structure that is classified as hierarchical and hybrid. Hierarchical, because the actions are divided into four logical levels: instinct, normal operation, abnormal operation, and optimization and prediction. And hybrid, because in addition to the logical part, the rules can trigger numerical routines that help in the agents' decision-making process. In addition to self- healing, several demand response functions are part of the agent, such as overload, load cutting, load prioritization, and load evolution. These functions allow the self- healing squealing solution found to consider the current system load and its evolution in the coming hours. In the proposed multiagent structure, agents only communicate with agents adjacent to it, reducing the need for a more robust communication system covering long distances. It is also proposed a structure of communication and exchange of messages with redundancy and effectiveness, mitigating the risks of erroneous communication between agents. Even with this type of communication, agent action occurs locally but is based on data received from multiple (even non-adjacent) system agents. The agent also implements functions that allow it to interact with the traditional protection systems of urban distribution networks, monitoring the operation of fuses, reclosers, and sectionalizers, allowing the advantages of an intelligent electrical network, even in a still incomplete system. The proposed multiagent system is validated through several examples using energy distribution systems and the computational implementation of the proposed hybrid hierarchical intelligent agents working together.
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8
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ALESSANDRO AUGUSTO NUNES CAMPOS
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Authentication for Integrated Circuit and Devices Using Blockchain and Physical Unclonable Functions
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Leader : TALES CLEBER PIMENTA
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MEMBRES DE LA BANQUE :
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HAMILTON JOSÉ MENDES DA SILVA
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DALTON MARTINI COLOMBO
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GABRIEL ANTONIO FANELLI DE SOUZA
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ROBSON LUIZ MORENO
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TALES CLEBER PIMENTA
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Data: 27 mai 2022
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Afficher le Résumé
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Secure components and devices have always been and always will be a challenge for the electronics industry. In this sense, there is a constant and growing demand for new solutions that can allow reliability in the use and authenticity of components and devices. The end user is not able to assess the existing risk, much less if the component or device is reliable in several aspects, mainly improper access to its information. This work presents a new approach with the integration of two tech nologies: Blockchains networks, which implement a kind of decentralized and inviolable database, which can increase resilience, security and guarantee against the alteration of the information registered in its structure; Physical Unclonable Functions (PUF), which allow the generation of a strong cryptographic key, since they use unique physical characteristics of each semiconductor component, considerably increasing security, simplicity, protection of industrial property and the opportunity for remote authentication of devices. The contribution here is in the integration of existing technologies, in order to obtain an innovative solution of authentication and cyber security for the internet of things and others devices.
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9
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PAULO HENRIQUE FERETTI
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NON-ISOLATED DC-DC CONVERTERS WITH LARGE CONVERSION RATE BASED ON MULTI-STATE SWITCHING CELL AND VOLTAGE MULTIPLIER CELLS
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Leader : ENIO ROBERTO RIBEIRO
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MEMBRES DE LA BANQUE :
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RENÉ PASTOR TORRICO BASCOPÉ
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BENEDITO DONIZETI BONATTO
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FALCONDES JOSE MENDES DE SEIXAS
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FERNANDO LESSA TOFOLI
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GABRIEL ANTONIO FANELLI DE SOUZA
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LUIS HENRIQUE DE CARVALHO FERREIRA
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Data: 6 juin 2022
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Afficher le Résumé
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This work presents the study and design of a family of non-isolated high step-up dc-dc converters, based on the multi-state switching cell (MSSC) and voltage multiplier cells (VMCs). These converters can be used in applications such as uninterruptible power systems and electric vehicles, which employ a few kilowatts power and require high voltage gain. Inherent advantages in the proposed topologies include reduced current and voltage stresses on the semiconductors, improved thermal distribution, good current sharing among the phases, and reduced dimensions of filter elements. Another relevant aspect is that the derived converters present modularity in terms of the possibility of extending not only the voltage gain, but also the rated power. A comprehensive theoretical analysis of the 4SSC-VMC boost converter, deriving from the proposed family, is performed. Experimental results obtained from a 1.3 kW prototype are presented and discussed to validate the theoretical assumptions.
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10
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MATEUS MENDES CAMPOS
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Ultrasonic-Capacitive Hybrid System for Fuel Oil Quality Analysis
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Leader : LUIZ EDUARDO BORGES DA SILVA
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MEMBRES DE LA BANQUE :
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CARLOS EDUARDO TEIXEIRA
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GERMANO LAMBERT TORRES
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GISCARD FRANCIMEIRE CINTRA VELOSO
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JOAO ONOFRE PEREIRA PINTO
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LUIZ EDUARDO BORGES DA SILVA
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Data: 15 juin 2022
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Afficher le Résumé
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Heavy fuel oils (HFO) are widely exploited to produce electric energy in Thermoelectric Power Plants (TPP), mainly due to the amount of heat released during its combustion. Economic factors also influence the use of HFO for energy generation, including the low cost of energy content, availability due to raw materials, ease of transport and storage, low operating investment costs, among others. The power to produce energy from HFO is defined by its calorific value (or heating value) and is linked to the quality of the fuel oil and the presence of contaminants, such as water. A fuel oil with properties different from those expected/specified can not only decrease the calorific value, but also can cause damage to the TPP equipment. Therefore, the analysis of the quality of fuel oils is of great importance for TPPs. This work proposes a methodology to estimate three parameters of the quality of fuel oils: the density, the water content in the oil and the calorific value. The proposed methodology has developed a system that has techniques such as ultrasonic, capacitive and temperature measurement to estimate quality parameters. The ultrasonic system is based on the propagation time of the ultrasonic waves to estimate two quantities, the speed of sound and the flow of the fluid. The capacitive system correlates the capacitance variation with the water content in oil, starting from the existing association between sensor, fuel oil and water. Temperature measurement data is used in conjunction with sound velocity data to compensate for the effect of temperature on the density estimation. Based on the temperature and velocity of sound information, and using a classification algorithm, a method was developed to recognize the existing similarity between the OC under analysis and the OC information from a database. With the result of the classification, the scores and the information from the database are obtained to estimate the density. Finally, the calorific value is calculated by associating the density and water content data. The results obtained from the tests were compared with data from laboratories and technical sheets of the OCs, reaching relative deviations lower than 1.0% and 0.5% for the density and calorific value, respectively.
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11
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GUILHERME GONÇALVES PINHEIRO
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Power Flow Control using Series Voltage Source Converters for Distribution Grids
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Leader : LUIZ EDUARDO BORGES DA SILVA
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MEMBRES DE LA BANQUE :
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CARLOS HENRIQUE DA SILVA
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JOAO ONOFRE PEREIRA PINTO
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LUIZ EDUARDO BORGES DA SILVA
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ROBSON BAUWELZ GONZATTI
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RONDINELI RODRIGUES PEREIRA
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WILSON CÉSAR SANT`ANA
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Data: 20 juin 2022
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Afficher le Résumé
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This study presents an application for a series VSC (Voltage Source Converter) in distribution grids for power flow management. Series devices have been widely studied for FACTS (Flexible AC Transmission Systems), however, more recently these devices have gained increased interest in applications for loading balance in medium voltage distribution grids. As the number of distributed generation (DG) units increases, increasing the capacity and reliability of distribution grids, while maximizing the benefits of installed DGs and loading behavior, is an ever more important task. In this work we describe a test system and control proposals for a practical application of series converters interconnecting two distribution feeders at 13.8kV under load variation disturbances. This approach provides solutions when installed at the end of distribution lines by interconnecting two feeders, resulting in capacity increases in the feeders without needing grid reconfigurations using a small-rated series VSC.
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12
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GABRIEL HENRIQUE DE FARIA
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Evaluation of Aging Factors of the Covered Cables of 15 kV Class and Its Impacts on the Insulation Coordination
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Leader : ESTACIO TAVARES WANDERLEY NETO
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MEMBRES DE LA BANQUE :
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ALAN MELO NÓBREGA
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ESTACIO TAVARES WANDERLEY NETO
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GUSTAVO PAIVA LOPES
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JOSE FELICIANO ADAMI
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MARIA ELENA LEYVA GONZALEZ
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RONALDO EUGENIO DE SOUZA FILHO
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Data: 29 juin 2022
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Afficher le Résumé
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Compact Distribution Network (CDN) provides a great reliability for the medium voltage electric system due to the polyethylene protection present in the cables, avoiding system interruptions caused by non-permanent contact between the cables and ground objects. Besides this, the reliability increase is also associated with the dielectric supportability increase of the system, considering the greater dielectric strength of the polyethylene in comparison with dielectric strength of the air. However, the polyethylene presents accelerated ageing in comparison with the glass and porcelain insulators, which are widely used in the conventional distribution network (without protection on the cables). The polyethylene degradation is even more accentuated in high temperature, humidity and pollution areas. Therefore, the polyethylene ageing may cause problems in the electric system, such as the increase of the maintenance, equipment replacement and short-circuits. On the other hand, there is a scarcity in the literature of laboratory methods capable of promoting the accelerated aging of the covered cables used in CDN. Most methods take into account the evaluation of other polymeric components and, often, the most effective methods are difficult to implement in the laboratory and have high costs. In this way, this work proposes two own methods to evaluate the aging of the covered cables, installed on polymeric insulators during the tests. The first ageing method consisted in the utilization of two factors: voltage application equal to the double of the system phase-ground voltage and pollution caused by salt fog. The second method added the thermic effect, due to the current induction in the cable, with the purpose to obtain 60ºC on its surface. To characterize the aging and evaluate the quality of the samples, were used in this work monitoring tests, divided into physicochemical tests and electrical test. The goal of the physicochemical tests is to determinate the ageing influence in the XLPE structure, analyzing the oxidation factor (IO), the activation energy (E) of the degradation process, the fusion heat (C) and the XLPE surface hydrophobicity. On the other hand, considering the electrical tests, this work evaluates the impact of the polyethylene (XLPE) ageing, present in the covered cables, in the CDN insulation coordination of 15 kV voltage class. The electric tests used were: partial discharge measurement, leakage current (CF) measurement and lightning withstand. Considering the results, the second ageing method caused material degradation, increasing the oxidation factors and reducing the system lightning withstand considering positive voltage impulses. On the other hand, regarding the first method, although the samples tested presented punctual damages during the test, it was not observed structural changes capable of causing reductions in the lightning withstand of the system. Analyzing the results, it was possible to equate the trend of the parameters IO, CF and Disruptive Voltage, in relation to the aging exposure time, using linear regression. Besides this, it was verified that, even aged, the lightning withstand of the system is higher than the Basic Impulse Level (BIL) of the system. The critic problem for the CDN is the failures events caused by superficial discharge on the material, in the form of erosion and tracking. Therefore, this work presents an accelerated ageing test method and evaluates the quality of covered cables.
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13
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LEONARDO DE CARVALHO VIDAL
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Análise de viabilidade econômica e ambiental da utilização de energia elétrica com sistema Shore Power em um contexto para instalações portuárias Brasileiras
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Leader : TALES CLEBER PIMENTA
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MEMBRES DE LA BANQUE :
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OSVALDO AGRIPINO DE CASTRO JUNIOR
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PAULO ANDRÉ DIAS JACOME
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GABRIEL ANTONIO FANELLI DE SOUZA
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GERALDO LUCIO TIAGO FILHO
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NEWTON NARCISO PEREIRA
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TALES CLEBER PIMENTA
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Data: 6 juil. 2022
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Afficher le Résumé
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Shore Power is one of the names given to the process of using the electrical energy available in maritime installations to supply the demand for electrical energy needed by a vessel during the period in which it is berthed, which can last from a few hours to several days, replacing the use of the vessel's generator (main or auxiliary) for the electrical energy supplied by the port facility. In this way, by not using marine fuel in this process, tons of this fossil fuel, which is rich in sulfur concentrations, is avoided, reducing the emission of CO2, NOx, SOx and other polluting particles into the atmosphere. In addition to emissions, replacing the onboard generator also brings with it the advantage of reducing vibration and noise in the port region. This work takes a bottom-up approach using historical data from the last eleven years of port movement in Brazil to verify what the impact would have been if the use of Shore Power technology had been applied in that period, in addition to indicating the potential for financial gain with its use in the future in the main port facilities in the country. Environmental, regulatory and resource availability issues are also addressed in this context. In addition, it was developed, through a computer tool, entitled "Shore Power System Installation Feasibility Calculator through Monte Carlo Simulation", registered with the National Institute of Industrial Property - INPI (Patents, Computer Programs and Topographies Directorate). of Integrated Circuits), with the aim of reducing, or at least realizing in advance, the impact of the instability of the financial markets, making it possible to plan the business or project using the Shore Power concept. seeking to indicate potential gains from its use, even if its use is not mandatory in the country, but which is shown as a green alternative in the search for the best and most conscious environmental practices, in addition to the creation of investment and technology in the country, both for the sector electricity and for the port.
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14
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MAX OLINTO MOREIRA
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PHOTOVOLTAIC GENERATION FORECASTING THROUGH COMPUTATIONAL METHODS PARAMETERIZED BY DESIGN OF EXPERIMENTS
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Leader : PEDRO PAULO BALESTRASSI
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MEMBRES DE LA BANQUE :
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TAKAAKI OHISHI
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ANTONIO CARLOS ZAMBRONI DE SOUZA
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BENEDITO DONIZETI BONATTO
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PAULO FERNANDO RIBEIRO
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PEDRO PAULO BALESTRASSI
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WESLEY VIEIRA DA SILVA
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Data: 12 juil. 2022
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Afficher le Résumé
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In recent years, renewable and sustainable energy sources have attracted the attention of various investors and stakeholders, such as energy sector players and consumers. Electric power systems have experienced the rapid insertion of distributed renewable generating sources and, as a result, face planning and operational challenges as new connections are made to the grid. It is very difficult to observe and anticipate the required levels of photovoltaic generation, which are tasks considered inherent to a quick insertion into the electrical grid. This distributed/renewable generation must be integrated in a coordinated way, so that there is no negative impact on the electrical performance of the grid, increasing the complexity of energy management. In this work, a multivariate strategy, based on design of experiments (DOE), is addressed for the prediction of photovoltaic generation using a new approach for parameterization and combination of a set of artificial neural networks (ANN). Two main questions will be explored: how to select the ANNs and how to combine them in the forecast by sets (ensemble). As a complement to this methodology, the reduction of dimensionality of climate data through Principal Component Analysis (PCA) is also presented. The design of experiments (DOE) approach is applied to the PV generation time series factors and to the ANN factors. Then, a cluster analysis is performed to select the networks that obtained the best results. From this point, a mixture analysis (MDE) is used to determine the ideal weights for the formation of the ensemble. The methodology is detailed throughout the work and, based on the combination of forecasts, the photovoltaic generation was estimated for a set of specific panels, located in the south of the State of Minas Gerais. Therefore, a more comprehensive study, which considered a dataset of seventeen generation plants, with seasonal characteristics, was also examined. The versatility of the proposed method allowed changing the number of factors to be used in the experimental arrangement, in the forecasting model and in the desired forecasting horizon and, consequently, improving the determination of the forecast for the studied scenarios.
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15
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ÉDISON MASSAO MOTOKI
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Interruption Cost in Industrial Process due Voltage Sag
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Leader : JOSE MARIA DE CARVALHO FILHO
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MEMBRES DE LA BANQUE :
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PAULO HENRIQUE OLIVEIRA REZENDE
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AURELIO LUIZ MAGALHAES COELHO
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FERNANDO NUNES BELCHIOR
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JOSE MARIA DE CARVALHO FILHO
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PAULO MARCIO DA SILVEIRA
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THIAGO CLE DE OLIVEIRA
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Data: 25 juil. 2022
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Afficher le Résumé
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With the advent of electro-electronic technology, the industries have invested in systems and equipment in order to increase productivity and quality of their products. At the same time, researchers indicate that, linked to their use the equipment and systems bring great sensitivity in their operation which impacts on production continuity, generating significant economic losses for companies, especially those in the industrial sector. Short-term voltage variations, mainly when there are momentary voltage sags bring very serious consequences for consumer units, especially for those industrial units with sensitive loads. It is, therefore, essential that studies on costs of interruption in industrial processes due to voltage sags begin to be prioritized by electric energy concessionaires and researchers, so that the results start contributing to the improvement of the image and relationship between the concessionaire and its customers, as well as for the academic society, technicians and agents of the electric sector. The objective of this work is to present the results of a methodology to obtain the costs of industrial stoppages due to momentary voltage sags. This is a direct survey, through a questionnaire with the consumer units, composed of several industries supplied by medium voltage networks granted by EDP – Energias de Portugal. Initially, 70 industries were selected, of which 60 were chosen by EDP itself. Of this total, 33 agreed to participate in the research. They are classified into 12 different types of activities, thus allowing an assessment of costs per event and per installed demand. The research was supported by an ANEEL R&D project by EDP, covering industries from the southeast region (São Paulo and Espírito Santo) and its results were very coherent compared to the few estimations that may be found in the literature, although these are related to shutdowns in general. Crowning the work, the costs found were used in order to have a broader evaluation (annual costs) from existing measurements at EDP, considering shutdowns that happened in 61 substations’ busbars in the states of ES and SP. Finally, it is worth mentioning that this research brought a relevant technical contribution to the Brazilian electricity sector, helping to fill gaps in the national literature when this subject tries to be addressed.
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16
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JOÃO MARCONDES CORRÊA GUIMARÃES
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DEVELOPMENT OF A PARTIAL DISCHARGE SENSOR AND A METHODOLOGY FOR SENSORS INVESTMENT PRIORITIZATION
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Leader : EDSON DA COSTA BORTONI
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MEMBRES DE LA BANQUE :
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EDSON DA COSTA BORTONI
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JAMIL HADDAD
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LEONARDO MESQUITA
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LUIZ OCTAVIO MATTOS DOS REIS
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ROBERTO AKIRA YAMACHITA
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RONALDO ROSSI
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Data: 26 juil. 2022
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Afficher le Résumé
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Power transformers are directly related to the electrical system reliability and power companies are pressured to improve the quality of service provided. In this scenario, real-time monitoring presents a strategic advantage by providing alarms and information for diagnostic algorithms and asset condition. However, the associated cost still is a limiting factor in the dissemination of monitoring systems, especially for lower value transformers such as those in distribution substations. This work contributes to the real-time monitoring of transformers on two aspects. The first being the development of a partial discharge sensor based on the IEC 60270 electrical method, motivated by the fact that the transformer life is directly associated with the condition of its insulation system and, according to the literature, approximately 36% of transformer failures are of dielectric origin, and the partial discharge measurement presents as one method for evaluating the condition of this system, since they are indicative of incipient defects and present an accumulative behavior. The developed sensor was submitted to laboratory tests to guarantee the operational safety of its application in 06 transformers of 145 kV for online monitoring and, also, it was used to measure partial discharges in a transformer with formation of combustible gases. The second contribution is a methodology for prioritizing investment in monitoring systems for distribution power transformers in the Brazilian regulated energy market, considering that for the monitoring of all subsystems of a transformer, other sensors are needed together with the partial discharge sensor developed in this work. This methodology considers the technical, technological, and regulatory dimensions and was implemented for a population of 848 transformers.
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17
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GUILHERME MARTINEZ FIGUEIREDO FERRAZ
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Premature Failure Detection in Power Transformers Through Analysis of Partial Discharge Signals
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Leader : ESTACIO TAVARES WANDERLEY NETO
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MEMBRES DE LA BANQUE :
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JOSÉ PISSOLATO FILHO
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ESTACIO TAVARES WANDERLEY NETO
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JOSE CARLOS GRILO RODRIGUES
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JOSE FELICIANO ADAMI
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MAURICIO CAMPOS PASSARO
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Data: 23 août 2022
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Afficher le Résumé
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This thesis presents an investigation aimed at detecting premature failures in power transformers. To achieve this objective, it was necessary to develop a partial discharge detection system by analyzing signals collected directly from the capacitive bushing terminals and from the earth leakage current. In this way, an innovative system of acquisition, data processing and monitoring of partial discharges was proposed by mitigating fragile points from the analysis of the state of the art of partial discharge measurement systems used by the main existing manufacturers in the world. Then, the challenges and main technological barriers for the design and manufacture of field sensors for this activity were addressed. Throughout the text, the technical choices adopted for the development of a monitoring system in the field and the computational challenges encountered during the process of developing an analysis computer program, agile and robust to failures, are described. Next, the digital filtering methods used for the task of switching between the time domain and the frequency domain are presented. Therefore, the proposed system aims to detect the formation of partial discharges in initial situations with data analysis techniques and capture by the capacitive coupler, process such information and define the correlation with established techniques of analysis of the formation of combustible gases detected in the insulating oil. The difficulties encountered during the investigation and the computational costs that this analysis action requires are also described. Finally, through case studies, we present some examples of fault detection in field-installed transformers, current transformers and lightning rods, the advantages of the fault detection system proposed in this research and its application to different devices that share the degradation through the formation of partial discharges.
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18
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GUILHERME SOUTO CHAGAS
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Enhanced Power Flow Methods in Complex Plane for VSC-MTDC Hybrid AC/DC Transmission Grids.
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Leader : ROBSON CELSO PIRES
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MEMBRES DE LA BANQUE :
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MAURÍCIO AREDES
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BENEDITO DONIZETI BONATTO
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CARLOS ALBERTO DE CASTRO JUNIO
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JOÃO ALBERTO PASSOS FILHO
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ROBSON CELSO PIRES
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ZULMAR SOARES MACHADO JUNIOR
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Data: 24 août 2022
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Afficher le Résumé
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The power flow problem is composed of phasor variables and quantities and thus can be naturally formulated in the complex domain; however, their applications are commonly developed in the real domain. The solution via the Newton-Raphson method, for example, would be restricted in the real domain once the Taylor series expansion in terms of complex variables alone does not exist. Thanks to the Wirtinger calculus, a Newton-Raphson method based on Taylor series expansions of nonlinear functions of complex variables and their complex conjugates becomes possible. As new technologies are implemented in power systems, such as the incorporation of FACTS devices, the development of power flow applications becomes increasingly intricate, and maintaining their formulations in the real domain is preceded by an arduous algebra task. To overcome this difficulty, a series of power flow solution methods are proposed in this work, specified to solve multi-terminal AC/DC hybrid systems, being formulated in the complex plane without any loss of precision. Both sequential and unified approaches for solving hybrid AC/DC power flow are derived in the complex plane. In order to improve the performance of the algorithms, an exact second-order power flow algorithm in the complex domain is also proposed. Such power flow models in the complex plane are naturally developed in Cartesian coordinates; therefore, most constraint equations can be written as quadratic functions. Consequently, the Taylor series expansion stops at its second order and the exact non-linearity of complex quadratic power flow equations is maintained. Minor changes in the code structure are required to transform the Newton-Raphson method into the exact power flow approach in the complex plane. The new algorithm exhibits either a superior behavior in fully AC or hybrid AC/DC networks. In order to show the validity of its formulations, the proposed algorithms are implemented in Matlab for well-established case studies of the IEEE-14, -30, -57 and -118 bus, a modified version of the IEEE Two Area RTS-96, and the Brazilian Southern-equivalent of 1916-buses, termed as SIN-1916. The features and advantages of the proposed algorithms are illustrated through the test systems interconnected across a DC network prone to several scenarios, e.g., topology, voltage control, and interchanging of active power.
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19
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FÁBIO JÚNIOR ALVES
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A Protocol to Guide the Development and Validation of ABA-Based Technologies for the Treatment of Autism
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Leader : GUILHERME SOUSA BASTOS
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MEMBRES DE LA BANQUE :
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CHRISTIANA GONÇALVES MEIRA DE ALMEIDA
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LYRENE FERNADES DA SILVA
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ADLER DINIZ DE SOUZA
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BENEDITO DONIZETI BONATTO
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GUILHERME SOUSA BASTOS
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RICARDO ZORZETTO NICOLIELLO VENCIO
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Data: 8 déc. 2022
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Afficher le Résumé
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Autism Spectrum Disorder (ASD) is a neurodevelopmental condition that affects about 1-2% of the global population and leads to long-term challenges in the daily social lives of individuals with the disability. Based mainly on behavioral symptoms, the ASD is usually diagnosed after the second year of life. Beyond that, research indicates that the prevalence rates of this disorder have increased during the last three decades. Early interventions based on Applied Behavior Analysis (ABA) have contributed to good results in treatments, demonstrating significant improvements in language, cognitive ability and social skills for many individuals diagnosed with ASD. Besides ABA, Assistive Technologies (ATs) such as games, robots, among others, contribute positively to the development and learning process compared to other instructional methods. Then, associating ABA practices with the use of technology can contribute to controllable intervention, structured, adaptable, stimulating and increasingly effective processes. However, it is observed that ATs designed based on ABA principles for ASD treatment do not meet the criteria proposed by this science. Thus, this paper's main objective was to propose ALVINA: A Protocol to Guide the Development and Validation of ABA-Based Technologies for the Treatment of Autism. As a way of expanding reflections and reinforcing the importance and benefits of ALVINA, an evaluation was carried out, which took place through the application of questionnaires, in which computer professionals and Behavior Analysts participated. As a result of this assessment, these professionals highlighted the relevance of ALVINA information, considering it capable of involving important and essential points in the understanding process of how to validate and design ABA-based ATs for the ASD treatment, besides intelligibly meeting the criteria for the fundamental principles of this science. All this demonstrates the professionals involved in the ALVINA assessment have recognized the importance and need of a protocol for the development and validation of a proposed AT to be used during the intervention process. Furthermore, as a way of demonstrating the applicability of ALVINA, it was used to validate the SEIA: Teaching System Based on Artificial Intelligence and ABA and TEO: An Interactive Game Suite To Support The Treatment Of Children With Autism. Through this validation, the Behavior Analysts analyzed the weaknesses and strengths of SEIA and TEO. The guidelines described by ALVINA were also used for the development of a prototype called AUTISMALG: Application to Assist in Teaching Identification and Counting Number for Children with Autism Spectrum Disorder. This prototype aimed to identify and understand the application of the recommendations of each guideline proposed by ALVINA in the development of an AT. Finally, it is expected that the guidelines proposed by this protocol be efficient in the validation and development of ATs, aiming to ensure the correct execution of ABA practices during the intervention process, thus providing improvements for the treatment of individuals with ASD.
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20
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RICARDO FRANCISCO ALONSO CARDOZO
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Reconfiguration of active systems with optimal allocation of batteries
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Leader : ANTONIO CARLOS ZAMBRONI DE SOUZA
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MEMBRES DE LA BANQUE :
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ANTONIO CARLOS ZAMBRONI DE SOUZA
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PEDRO PAULO BALESTRASSI
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ELIANE VALENCA NASCIMENTO DE LORENCI
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GILNEY DAMM
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GLAUCO NERY TARANTO
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JULIO CESAR STACCHINI DE SOUZA
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Data: 9 déc. 2022
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Afficher le Résumé
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Resilience of electrical power systems is a paradigm that has been studied in order to provide continuity to the electrical energy service during the interruption of the main source. This leads to the need to use the existing resources in the microgrid in an intelligent way in order to, first, serve as many users as possible and second, for the longest possible time. Then the question becomes an energy optimization problem. In this context, the service of important loads such as hospitals, government, transport, public lighting, and telecommunications has to be considered as a priority. In this work, the connection of priority loads is made before the other loads. The restoration of loads can be done from a centralized or in a decentralized way. In this work, the reestablishment of loads will be analyzed in a centralized way, from a supervisory organism or Distribution Management System, ADMS for its acronyms in English (Advantage Distribution Management System). The methodology includes the remote connection and disconnection of loads and switches, as well as the allocation of battery-DC/AC inverter set mounted on trucks (MTBESS) at strategic points intelligently chosen in order to restore the largest amount of priority load possible first and then the other loads. In this sense, MTBESS are a very important asset to achieve this multipurpose. This work proposes a strategy for the use of MTBESS in charging and discharging regimes with the idea of supporting the other generation sources to meet the demands during the interruption time. Distribution systems are very dynamic, scenarios vary depending on distributed generation availability, time of day, typical day, etc. So the allocation of battery trucks, the state of switches (open or closed) and connected loads may vary according to these scenarios.
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21
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JOSÉ HUGO DE CARVALHO SOUZA
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AUTOMATIC SYSTEM FOR CONTROL OF OVERFLOW REACTIVE IN OBSOLETE SUBSTATIONS BY COLOR PETRI NETWORK MODELING (RDP)
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Leader : BENEDITO ISAIAS LIMA FULY
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MEMBRES DE LA BANQUE :
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MARA LUCIA MARTINS LOPES
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ANNA DIVA PLASENCIA LOTUFO
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BENEDITO ISAIAS LIMA FULY
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CAMILA PAES SALOMON
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MAURICIO CAMPOS PASSARO
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Data: 9 déc. 2022
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Afficher le Résumé
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This work presents a new approach for the treatment of surplus reactive energy in industrial plants that has capacitor banks in the substation in obsolescence and limited to high numbers of maneuvers. The purpose of this thesis is to perform studies for the purpose of optimizing a discrete distributed system, from data sampled in the industrial sector, which contains problems in the substation power factor control system and consequently reactive energy surplus. In order to propose solutions to these problems, the modeling of the distributed system and the analysis of its properties were carried out through computer simulations. The tool that was used for a discrete system is the Colored Petri Net in CPN Tools. From the RdP model we obtain an autonomous decision-making system to connect and disconnect the capacitor banks according to the current of the furnaces, voltage, time of operation of the loads, discharging time of capacitor banks and time of day defined by resolution ANEEL 505, of November 26, 2001 aiming at reaching the power factor close to 1.00 and minimized numbers of high voltage circuit breaker operations. Implementing the model eliminates over reactive, fines, extends the lifetime of circuit breakers, capacitor banks, reduces the exposure of people in circuit breaker maneuvers and does not send noise on the transmission lines of the concessionaire. Completing the development and implementation of the new logical model of the power factor automation system, it was possible to achieve a 96% reduction in excess reactive energy, equivalent to 720,423 kWh per year in energy bills sent by the utility and a reduction of 90.4% number of circuit breaker operations compared to the traditional method of capacitor bank automation. The system also enabled a better structured understanding of the automation logic and assertiveness in the implementation of the system in the industrial controller, not generating interference in the process and rework. Key-
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22
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ANTONIO ALVES FERREIRA JÚNIOR
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Modeling chromatic dispersion effects in radio-over-fiber transmission using microwave photonics
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Leader : DANILO HENRIQUE SPADOTI
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MEMBRES DE LA BANQUE :
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LICINIUS DIMITRI SÁ DE ALCANTARA
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CARLOS ALBERTO DE FRANCISCO
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DANILO HENRIQUE SPADOTI
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GABRIEL ANTONIO FANELLI DE SOUZA
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JOSE ANTONIO JUSTINO RIBEIRO
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MATEUS AUGUSTO FAUSTINO CHAIB JUNQUEIRA
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Data: 15 déc. 2022
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Afficher le Résumé
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This work presents a proposal for closed analytical models for the analysis of radio-over-fiber (RoF) communication systems using microwave photonics. The influences of the optical fiber chromatic dispersion effects and the electro-optical modulators and photodetector nonlinearities on the received signal power were investigated. This contribution on the subject makes it possible to analyze the transmission of radiofrequency (RF) and microwave signals over long distances. By setting some parameters, it is possible to evaluate different applications such as generation and conversion of high frequency signals and photonic filters in the RF and microwave bands. Analytical solutions applicable to modern communication systems that employ 5G and 6G resources and that use analogue optical links were developed. For this, the Graf addition theorem was used for the Bessel functions of first kind and the Fourier transform, showing the spectra for the different parts of the system in the frequency domain. The results between the proposed large signal models and the approximate models were compared, highlighting the most significant differences. The models contemplate parameters of interest in the projects of these systems, including signals with large amplitudes. Among the most relevant values highlighted are the modulation RF signals frequencies, the modulation indices, the losses, the nonlinearities and the transmission coefficients of the electro-optical modulators. Also, the wavelength and power of the laser, the photodetector responsivity and nonlinearity, the attenuation, the length and the chromatic dispersion of the optical fiber, are evaluated. To evaluate the proposed analytical models, the radio over fiber links with phase and intensity modulations, both with direct detection, were investigated. The analog optical modulation formats such as phase, double sideband intensity, single sideband and suppressed carrier, were adopted. External electro-optical modulators such as phase and Mach-Zehnder intensity with dual-drive and with single drive, were used. In addition, applications are presented in microwave frequency generation and in OOK digital information transmission, both using the proposed models. With a single model, it is pos-sible to determine the link responses with different analog optical modulations that use phase or amplitude modulators and with direct detection.
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23
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ALENCAR FRANCO DE SOUZA
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PROPOSAL FOR A NEW TOPOLOGY OF CA-AC CONVERTER TO SWITCHED CAPACITOR
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Leader : ENIO ROBERTO RIBEIRO
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MEMBRES DE LA BANQUE :
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EDILSON MINEIRO SÁ JUNIOR
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ROMERO LEANDRO ANDERSEN
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ENIO ROBERTO RIBEIRO
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FERNANDO LESSA TOFOLI
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GABRIEL ANTONIO FANELLI DE SOUZA
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WANER WODSON APARECIDO GONCALVES SILVA
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Data: 16 déc. 2022
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Afficher le Résumé
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The present work aims to present a new topology of direct AC-AC converter to switched capacitor. This topology employs only semiconductor elements and capacitors, presenting itself as an alternative to low voltage autotransformers with reduced cost and size. This new structure can operate as a voltage step-up or step-down, with a gain of up to 3 or even 1/3, providing 3 different output voltage levels. Initially, the context of the use of autotransformers is shown for different applications. Direct AC-AC conversion structures are presented, from those that operate at low frequencies using controlled rectifiers, to those driven by PWM that employ high-speed switches. Among the latter, the switched capacitor converters stand out due to their constructive simplicity and performance. In this work, the proposed new topology and its operation steps are presented. Mathematical expressions are developed to calculate the elements that make up the converter. Finally, a circuit is designed, simulated and tested on the bench so that its calculations and operation can be validated. In bench tests, the converter showed an efficiency of 87.18% and regulation of 92.68% at full load. At the end of the text, a proposal for the continuity of the work for the conclusion of the thesis is presented.
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