High Gain Voltage SEPIC Converter for PV System

The main objective of this paper is to propose a modified structure for a SEPIC-type DC-DC converter and to compare it to the simple structure. An incremental conductance (INC) MPPT controller is chosen and applied to both converters in order to extract the maximum available power. The modified converter structure is obtained by adding an inductor and a capacitor to the conventional converter. With this new structure, we go from a step-up/down converter to only a step-up converter. Simulation results, with Matlab/Simulink, illustrate better performances with the modified structure compared to the classical SEPIC structure, less output power oscillation and high voltage gain are guaranteed.