瞬时电压补偿装置的零序电压控制

ZERO SEQUENCE VOLTAGE CONTROL OF DYNAMIC VOLTAGE RESTORER

分析了瞬时电压补偿装置 ( DVR)产生零序电压及其放大机理。分析表明 ,即使系统不存在零序回路 ,DVR都会在补偿控制中向系统注入微小的零序分量 ,该零序分量会对无零序回路系统侧电压造成不良影响。为此 ,提出了新的控制策略 ,该控制策略通过检测并消除指令中的零序分量 ,以破坏无零序电流回路系统的零序电压正反馈条件 ,消除 DVR注入零序电压的不良影响。仿真结果表明 。

This paper analyzes the mechanism of zero sequence voltage generating and its magnification by DVR. It shows that DVR will inject small zero sequence component into the power system during compensation control even if there is no zero sequence circuit. This will influence the voltage on system side. So a new control strategy is proposed to detect and suppress the influence of zero sequence component injected by DVR. Simulation results show that the proposed strategy is correct and effective.