Modelagem e controle de um conversor CUK isolado com célula R2P2 e multiplicador de tensão

Abstract

In recent years, there is an increasing energy demand due to the use of fossil fuels and it has caused very large impacts on nature. As scientists and industries are aware that this type of production uses limited reserves, there is a worldwide tendency to increase studies and investments in alternative energy sources. One of the sources that stands out is the photovoltaic energy due to its flexibility in power and integration with the distributed generation system (DG). This dissertation presents the analysis, design and implementation of high voltage gain isolated DC-DC converters, all applied to the photovoltaic energy processing. These converters are based on the Boost and Cuk converters. The high voltage gain will be possible through the use of high gain cells – a concept that is defined in this work. Galvanic isolation will be used to provide insulation and voltage gain. To extract the maximum power from the photovoltaic module, the Maximum Power Point Tracking (MPPT) will be tested. This mechanism will be designed and implemented directly, controlling the input voltage of the DC-DC converter. The experimental results are performed for two prototypes, an isolated Cuk converter R2P2 cell and voltage multiplier. The second, on isolated Cuk R2P2 converter. The second converter does not have the multiplier on the secondary. The efficiency of the converters will be analyzed when applied to 200 W photovoltaic panel.