基于DPC-SVM控制的三电平PWM整流器仿真研究

直接功率控制(DPC)和电压定向矢量控制(VOC)是PWM整流器常用的控制技术。DPC控制动态响应比较快,但其稳态性比较差,而且开关频率不固定,给滤波器的设计带来困难。VOC控制精度高,但算法实现比较复杂。在此基础上提出了一种空间电压矢量控制与直接功率控制结合的控制策略,即DPC-SVM。该控制结构为直流输出电压外环,功率控制内环,无功功率参考值设为0,以达到单位功率因数,设计了功率环的参数,对系统进行了仿真研究。结果表明,所提出的控制技术有好的动静态性能,直流母线电压超调量小,电流谐波总畸变率小,并且弥补了直接功率控制和电压定向矢量控制的缺点。

The Study of Three-level PWM Rectifier Based on DPC-SVM

Direct power control （DPC） system and conventional voltage oriented control （VOC） system are often used to control rectifiers. The dynamic performance of DPC is better, but the steady performance is not so good. and the switching frequency of DPC is changeable, and it brings difficulties in designing the filters. VOC is better in that two aspects, but it is difficulty. So this paper researches into a control method of DPC combined with space vector modulation （DPC-SVM）. The new method uses closed-loop DC voltage control as outside control and closed-loop power control as internal control, and gets analyze result by Simulink software on the base of math model. It is shown that the new strategy exhibits less deviation of the current, and the dynamic performance of is better as well as the steady performance. As a result, the new method can set off disadvantages of DPC and VOC.