电网不平衡时的三相PWM整流器控制策略

A Control Method for the Three Phase Three Wire VSR System under the Unbalanced Source Voltage

三相电网不平衡时,电压会存在负序分量。此时,如果对三相电压型PWM整流器采用普通的控制策略进行控制,会使其网侧电流含有大量的谐波,从而无法得到正弦输入电流。文章通过对三相电压型PWM整流器在电网不平衡情况下的建模,分析了网侧电流谐波产生的原因。在此基础上,采用了一种能使其网侧电流正弦化的控制策略,并进行了仿真验证。研究表明,该控制策略有良好的控制能力,可以使得交流侧电流达到正弦。

This paper proposes a control method for the three phase three wire VSR under the unbalanced system. The system will be converted to the dq synchronous rotating frame（SRF）. The PI controller would be used to adjust the current and the notch filter would be needed to get the positive component of the source voltage.