Fuzzy logic control of a photovoltaic systemconnected to grid

Abstract

In order to select and generate optimal duty cycle for the maximum power point tracking (MPPT)in photovoltaic has been studied based on several techniques. In this paper, modified fuzzy logic controller (FLC) algorithm is proposed for better efficiency of a photovoltaic (PV) system connected to grid. The obtained results show that, the proposed fuzzy logic controller (FLC)is able track the maximum power in normal condition and abnormal conditions of solar radiation. Boost converter is used as an interface between the photovoltaic panels and the load. Then, the output voltage is converted to AC voltage via an inverter based on proportional-integral (PI) controller. the phase locked loop (PLL) is introduced for the synchronization and the LC filter is used to minimize the harmonics of output AC voltage. The obtained simulation results using Matlab/Simulink software show the effectiveness of the proposed control.