Direct fuzzy logic controller for voltage control of standalone three phase inverter

This paper presents an adaptive control strategy for voltage regulation of three phase inverter in the standalone application. A direct type adaptive fuzzy logic controller (FLC) is employed which reduces the computational cost and guarantees stable load voltage during both steady state and load disturbance. To validate the effectiveness of the proposed control strategy, the output voltage and power flow waveforms of 80kW inverter are presented. In addition, the frequency spectrum of the load voltage is presented to evaluate the harmonic distortion. The system is simulated in Matlab/Simulink software with off-grid linear as well as nonlinear loads. The nonlinear load employed for performance evaluation is a three phase diode rectifier with inductive filter.