Modelagem e controle de um conversor CC-CC sepic isolado de interruptor único com célula dobradora de tensão na saída para aplicação em microinversor fotovoltaico
This dissertation presents a study of an isolated DC-DC converter model for interfacing or coupling via a DC bus with a DC-AC converter in a microinverter. The proposed structure initially uses the already known sepic DC-DC converter model, but techniques are used to achieve a greater gain in the us...
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| Formato: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | Brasil |
| Recursos: | Universidade Federal de Santa Maria (UFSM) |
| Repositorio: | Manancial - Repositório Digital da UFSM |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.ufsm.br:1/31578 |
| Acesso em linha: | http://repositorio.ufsm.br/handle/1/31578 |
| Access Level: | acceso abierto |
| Palavra-chave: | Engenharia elétrica Eletrônica de potência Energias renováveis Sistemas solar fotovoltaico Microinversor Conversor CC–CC Electrical engineering Power electronics Renewable energy Microinverter DC-DC converter CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
| Resumo: | This dissertation presents a study of an isolated DC-DC converter model for interfacing or coupling via a DC bus with a DC-AC converter in a microinverter. The proposed structure initially uses the already known sepic DC-DC converter model, but techniques are used to achieve a greater gain in the use of advantages that the conventional topology cannot provide. The topology achieved is the result of joining two isolated sepic DC-DC converters, the junction is made in such a way that the structure achieved uses only a single switch and a voltage doubler cell is incorporated at the output of both in order to allow the converter to have the capacity to establish a high voltage gain with a low duty cycle and low transformation ratio for the coupled inductor. The topology is designed to operate as the DC-DC block of a microinverter for systems of up to 500W. The sepic DC-DC converter proposed in this dissertation is modeled and a compensator is sequentially designed to control the input voltage. The control operates in conjunction with a maximum power tracking algorithm (MPPT) of the P&O type, through which a voltage reference is provided to allow the control to act and consequently generate the duty cycle signal. To validate the approaches, a prototype 500 W converter was designed, built and subjected to numerous laboratory tests, with the static gain, waveforms, control and efficiency being experimentally evaluated, the latter reaching a maximum value of 95%. As a result, it can be concluded that despite the satisfactory results, it can be seen that a more appropriate construction of the component design could result in the mitigation of certain problems and possibly improve the efficiency of the system. |
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