Modeling three-phase grid-connected inverter system using complex vector in synchronous dq reference frame and analysis on the influence of tuning parameters of synchronous frame PI controller

Abstract

This paper presents a mathematical modeling of three-phase grid-connected inverter system including output LCL filter and closed loop control using complex vector notation. The control scheme used is synchronous frame PI control on complex space vector of grid current in synchronous dq reference frame. Effect of controller's tuning parameters is investigated using complex vector root locus and complex vector frequency response function of closed loop system according to different tuning parameters. Control scheme and three-phase grid-connected inverter are simulated using MATLAB Simulink and SimPowerSystems™.