Abstract: The solar photovoltaic power has received great attention and experienced impressive progress all over the world in recent years because of more and more serious energy crisis and environmental pollution. The system consists of a photovoltaic solar module connected to a DC-DC Buck-boost converter. The system has been experienced under disturbance in the photovoltaic temperature and irradiation level. The fuzzy controller for the SEPIC MPPT scheme shows high precision in current transition and keeps the voltage without any changes, in the variable-load case, represented in small steady-state error and small overshoot. The proposed scheme ensures optimal use of PV array and proves its efficacy in variable load conditions, unity, and lagging power factor at the inverter output (load) side. The performance of the proposed FLC-based MPPT operation of SEPIC converter is compared to that of the conventional proportional–integral (PI)-based SEPIC converter. The system consists of a photovoltaic solar module connected to a DC-DC Buck-boost converter and towards three phase inverter.

Keywords: MPPT-maximum power point tracking, SEPIC-single ended primary inductor converter, FLC-fuzzy logic controller, PI-proportional integral, PV-photo voltaic.