基于UPQC的三相电流平衡补偿控制

Three-Phase Current Balance Compensation Control Based on Unified Power Quality Conditioner

统一电能质量控制器(UPQC)控制单元中既要控制静止同步无功补偿器(STATCOM)又要控制静止同步串联补偿器(SSC),灵活性和速动性降低且成本较高。对UPQC补偿装置进行具体的修改,UPQC的补偿原理主要是通过SSC交流侧输出一串联的电压以改变负载的实际工作电压,对STATCOM部分不要实施控制,故将UPQC中STATCOM部分的全控型电力电子器件换成二极管,从而得到了UPQC装置。以广东某一变电站为例,计算并用Matlab进行了仿真,结果表明,该补偿装置提高了控制的灵活性和速动性,且降低了成本。

The control unit of unifed power quality conditioner （UPQC） controls both the static synchronous reactive compensator （STAT-COM） and the static synchronous series compensator （SSC）, which can reduce the fexibility and speed of the device, with relatively high cost. The compensation device of UPQC was carried out concrete modifcation. The compensation principle of UPQC got through the SSC alternating current side and output a series of voltage to change the actual load voltage, without control to the STATCOM, so that the full controlled power electronic devices of STATCOM part in the UPQC could be replaced by the diodes to obtain the UPQC device. Matlab simulation shows that this compensation device improved the fexibility and speed of control and reduces the costs.