Navegando por Assunto "Conversores CC-CC"

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Acesso aberto (Open Access)
Avaliação operacional das diferentes arquiteturas de interligação de geradores fotovoltaicos à rede elétrica
(Universidade Federal do Pará, 2017-06-13) TELES, Mailson Borges; MACÊDO, Wilson Negrão; http://lattes.cnpq.br/3386249951714088
This work aims to experimentally evaluate the string, microinverter and d.c.-d.c. converter technologies, in order to contribute to scientific knowledge construction in applications of the different interconnection architectures of photovoltaic generators to the conventional electric grid. For this, were used different systems installed at GEDAE’s laboratory (UFPA), located in northern region of the country. It was compared the performances according to the information from different data acquisition mechanisms available in the laboratory. In face of some of these data acquisition mechanisms provide only the value of energy accumulated throughout the day, a focus was given on the overall operation of the different systems analyzed. However, in those systems which greater operational details were monitored, either by the equipment's own acquisition system or already existing equipment in the laboratory (Fluke Digital Storage Oscilloscope, Digital Power Meter, etc.), important point analyzes with more detailed operation of the system were performed. The obtained results show that the d.c.-d.c. converters system presented superior performance to the other monitored systems. However, it has been found the occurrence of problems due to the pairing process of the d.c.-d.c. power converters in the operation of such systems that remain until now.
Acesso aberto (Open Access)
Técnicas de controle robusto baseadas em resposta em frequência e via alocação de polos intervalar para sistemas com incertezas paramétricas aplicadas ao problema de regulação de tensão em conversores de potência.
(Universidade Federal do Pará, 2022-05-12) CARDOZO, Luise Ferreira; BARRA JUNIOR, Walter; http://lattes.cnpq.br/0492699174212608
Microgrids are a form of distribution system, which belong to the broad concept of smart grids. Multiconverter or multilevel systems are nothing more than DC microgrids composed of several power converters connected in cascade and/or in parallel. In this way, the multiconverter system described in this thesis has a DC - DC converter in the Buck topology, which is used as a source of direct voltage for the main bus of the microgrid, being an element of fundamental importance and whose voltage control is essential, because electronic loads are sensitive to voltage deviations. In order to control the voltage on the DC bus, the system is first modeled using the recursive least squares method, at which time the parametric variations are obtained forming a more comprehensive model called the interval transfer function, which is represented graphically by the extreme set. In a second moment, two robust controllers are developed, one through the extreme stability margins of the model culminating in a PI controller based on frequency response, and the other through an interval pole allocation control project in PID format. The robust performance of the controllers is evaluated through computational simulation, experimentally in the multiconverter system and, finally, using a quantitative analysis through performance indices.