Research on the PWM rectifier´s voltage loop after the fuzzy algorithm is adopted

This paper expounds the double closed-loop control configuration which is composed by the outer voltage control loop and the inner current loop of the PWM rectifier, and the function of the outer voltage control loop is pointed out. To improve the control performance, a voltage controller whose voltage loop is designed by the fuzzy algorithm is used. The voltage error fuzzy variable e´s membership functions is researched, and also the Rate of change of the voltage error fuzzy variable ce and the fuzzy variable Δu which is exported by fuzzy controller. Their influences to the control performance are considered. After the simulation experiments, it shows that the voltage outer loop fuzzy control is feasible and effective. The performance of the outer voltage control loop can be improved.