DPC System of Three-phase PWM Rectifier Based on a Novel Switching Vector Table

The reactive power is out of control near the fundamental voltage vector in traditional direct power control (DPC) system,which leads to the current distortion at AC side and the voltage fluctuation at DC side.The functioning mechanisms of the instantaneous active power and the reactive power are analyzed in view of the mathematical model of PWM rectifier DPC system.A new control strategy is designed based on novel switching table and novel sector division. This method has the advantages of rapid regulation for instantaneous active power,and can restrain reactive power fluctuation and reduce switching frequency.Simulation and experimental results verify its feasibility and effectiveness.