Three-phase PWM rectifier based on sliding-mode variable structure control

Aiming at the poor dynamic performance of current three-phase PWM rectifiers, a control system with double close-loops of voltage and current is designed based on the mathematical model of 3-phase PWM rectifiers. The decoupled currents in dq synchronous reference frame are separately controlled within the inner-loop of current control, for which the sliding-mode variable structure control is applied. Simulative and experimental results indicate that, with simple structure, the method improves the dynamic performance of PWM rectifiers, realizes the decoupled control of current and strengthens the system robustness.