Novel Modulation Strategy of Direct Power Control of PWM Rectifier Based on Virtual Flux

The paper analyzed working principle and characteristics of virtual flux direct power control for PWM rectifier.It put forward a novel modulation strategy of direct power control of PWM rectifier based on virtual flux in order to resolve the problem of unsteady of system adjustment caused by structure deficiecy of traditional switching table,which through restructure switching table to improve adjustment ability and characteristics of input and output of rectifier.The simulation result showed that the novel strategy can weaken the phenomenon that reactive current is out of control near the voltage vector,control active power and reactive power effectively and ensure rectifier operates under unit power factor.