MPPT for a three-phase grid-connected PV system (Fuzzy Logic Controller vs. PI Controller)

In this paper, a comparison between fuzzy logic controller (FLC) and conventional PI controller has been presented for interfacing PV array with utility grid through a three-phase line-commutated inverter. The main objective of the controller is providing maximum power for utility grid. The Simulink model of the studied schemes has been built using MATLAB/PSB for generating firing pulses of the thyristors in the inverter. According to simulations, FLC is dominating PI controller in many important aspects like, provided active power for grid, shape of output current of inverter, grid current and total harmonic distortion level (THD) of this current.