基于改进扰动功率法的电压暂降源定位

Voltage sag source location based on the improved disturbance power method

面对引发电能质量问题的电压暂降,结合电力系统中常见的短路故障类型,提出一种改进的扰动功率法。取扰动电压和扰动电流的乘积作为扰动功率,根据线性电路的叠加原理,故障网络可以等效成正常状态和扰动分量的叠加,利用瞬时扰动功率或其半周波平均值的极性来定位暂降源,最后搭建模型,通过Matlab仿真,结果表明提出的改进的扰动功率法可以准确定位暂降源。

In the face of power quality problems caused by voltage sag, this paper proposes an improved disturbance power method combined with the common type of fault in power system. It redefines the disturbance power by taking the disturbance voltage multiplied with the disturbance current, according to the superposition principle of linear cir- cuit, fault network can be equivalent to the normal plus the disturbance component, and then it uses the polarity of transient disturbance power or half-cycle average to locate the voltage sag source. Finally through simulation by Matlab model, this approach proves to be accurate in voltage sag location.