DSP-Based Control of the New Current Hystersis PWM Rectifier System

In this paper, according to the control requirement and actual project conditions of three-phase high power factor rectifier, the research of low switching losses three-phase PWM rectifier adopts hysteresis current control strategy which bases on load current feed-forward control. The system not only improves the high-frequency switching problem, but also makes that the system has much lower dependence on the PI parameters of the outer-loop voltage regulator than conventional hysteresis current control PWM rectifiers. The system works well even under unbalance power conditions. Both simulated and experimental results confirm the validity of the new control strategy and lower dependence on the PI parameters of the outer- loop voltage regulator.