Abstract

Renewable energy generation systems, based on photovoltaic sources, currently represent the most suitable solution, for low power levels, to reduce the energy consumption produced by oil and gas. Moreover, they are becoming more and more attractive as the price per watt of the photovoltaic modules is decreasing. However, the conversion efficiency of commercial photovoltaic modules is still rather low so it is particularly important to be able to achieve, in every operating situation, the maximum possible energy. The paper focuses on double-stage, grid-connected, Photovoltaic conversion systems. In this frame, different structures of resonant DC-DC converters, which allows reduced switching losses, are analyzed accounting the specific behavior of Photovoltaic sources. LLC resonant converters are more suitable for photovoltaic applications. Simulation results based on MATLAB/Simulink verify the operation analysis and the efficiency improvement

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