Research on Electric Vehicle Charger Based on Current Source PWM Rectifier With Direct Power Control

To meet the requirement of charging characteristics for electric vehicle unit and battery, an improved direct power control strategy is proposed based on current source PWM rectifier. By analyzing conventional current vector control based on the six intervals of direct power systems, the control methods with twelve intervals and the adding freewheeling diode on DC side are proposed, which improve the selection of the optimal current vector to gain rapid response and reduce average switch frequency to decrease the current harmonic content, by which the switch Table is deduced. In the end, the EMTDC/PSCAD simulation shows that the improved direct power control method can increase control accuracy and rapid response speed, and reduce the average switching frequency.