基于直接功率控制的电流型PWM电动汽车充电装置

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

针对电动汽车充电装置和电池充电特性要求,提出了基于电流型PWM整流器的改进直接功率控制策略。在分析传统的基于直接功率系统六区间的电流矢量控制基础上,提出采用以十二区间划分的控制方法与直流侧增加续流二极管方法,改进最优电流矢量的选择以达到快速响应和降低平均开关频率,进而减少电流谐波含量,并推导了该方法得到的开关表;最后用EMTDC/PSCAD仿真软件对改进后的直接功率控制方法进行了可行性验证,证实其可以增加控制精度和快速响应速度,减少平均开关频率。

To meet the requirement of charging characteris- tics 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 re- sponse and reduce average switch frequency to decrease the current harmonic content, by which the switch Table is de- duced. 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.