Research of Voltage Source PWM Rectifier Based on LCL Filter

In view of problems that high harmonics of switching frequency of voltage source PWM rectifier pollute power grid and traditional control strategies of voltage source PWM rectifier are all based on two-phase rotating coordinate which has cross coupling member of current and large calculation, the paper proposed a control algorithm of voltage source PWM rectifier based on LCL filter under two-phase static coordinate. The algorithm makes voltage source PWM rectifier system under three-phase static coordinate transform voltage source PWM rectifier system under two-phase static coordinate by use of Clark transform system, which avoids cross coupling member of current under two-phase rotating coordinate; the algorithm uses quasi-resonant regulator to control current of the rectifier, which realizes tracking control for current. The Matlab simulation result proved correctness and feasibility of the algorithm.