Proportional Integral Resonant Current Controller for Grid Connected Inverter in Distributed Generation System using SVPWM Technic

This paper introduces a modified controller for current regarding 3-phase voltage source inverter (VSI) connected to the grid via LCL filter. The proposed control scheme conducts with firm switching frequency utilizing space vector Pulse Width Modulation (SVPWM) technic. A LCL filter is used with VSI, due to its ability to filter out high frequency switching ripple at a diminished inductance. The proposed current controller is designed to handle both islanded and grid connected mode. It removes the limitations of Proportional-Integral (PI) and Proportional-Resonant (PR) controllers with third harmonic compensation capability. The proposed controller is simulated in MATLAB/Simulink platform for the above mentioned two modes of operation and moreover at disturbance condition.