Abstract：The problems are that PI regulator can not get a good dynamic characteristics under disturbances and the typical nonlinear structure of the three-phase voltage PWM rectifier. Based on the three-phase voltage PWM rectifier's d-q mathematical model, this paper puts forward the sliding mode control which has good control effects for the nonlinear system. It firstly gives the design methods of the PI control and sliding mode control. Then, through the simulation comparison with the double-loop PI control and double-loop hybrid sliding mode control, it concludes that double-loop hybrid sliding mode control is small overshoot, fast dynamic response and good robustness. At last, the experimental prototype is built, and the results show that the sliding mode control is correct.

Keyword：rectifier;PI control;sliding mode control;PWM;