Constant-frequency-hysteresis direct power control strategy for single phase PWM rectifiers

The direct power control (DPC) strategies are classified as two main control modes: DPC based on switching table hysteresis method and DPC based on space vector modulation (SVM) method, which are named STH_DPC and SVM_DPC, respectively. Compared with the two DPC strategy modes, this paper presents a new DPC mode of single phase PWM rectifier by using constant frequency hysteresis method, named constant frequency hysteresis DPC (CFH_DPC). Compromising the two classical DPC strategies features, the advantages of the proposed control strategy are summarized as follows: it can gain fast dynamic performance by using two power hysteresis comparators instead of proportion- integration (PI) controllers, and achieve a constant switching frequency by using SVM. Experimental tests have been conducted to verify effectiveness of the proposed CFH_DPC strategy.