基于扰动无功功率的电压暂降源定位

暂降源定位对于查找暂降源、划分暂降责任有重要作用。为了确定暂降源的上下游位置，本文从线性电路的叠加原理入手，通过分析故障过程中电气特征变化规律，提出了基于扰动无功功率变化特征的电压暂降源定位方法。当发生三相对称故障时，如果监测点的正序扰动无功功率方向与规定正方向一致，电压暂降源在上游，反之则在下游；当发生不对称故障时，如果监测点的负序扰动无功功率方向与规定正方向一致，电压暂降源在下游，反之则在上游。大量仿真与实测数据表明，本文方法不受暂降持续时间影响，能够实现电压暂降源的上下游定位，具有较高准确率。

Voltage sag location based on disturbance reactive powerHU An-ping1, 2, TAO Yi-bin1, 2, YANG Bo1, 2, QU Ke3, LI Guan-jun1, 2, DING Kai4

Voltage sag location plays a significant role in seeking voltage sag source and dividing responsibility. In order to determine the location of a voltage sag source, based on the superposition principle of linear circuit and through analyzing the change rules of electrical characteristics during faults, a voltage sag location approach is proposed on the basis of change features of disturbance reactive power. When a three-phase symmetric fault occurs, the voltage sag source is determined in the upstream if the direction of positive-sequence disturbance reactive power is in accord with the regulated positive direction at a monitoring point, otherwise, in the downstream. When an asymmetric fault occurs, the voltage sag source is determined in the downstream if the direction of negative-sequence disturbance reactive power is in accord with the regulated positive direction at a monitoring point, otherwise, in the upstream. A large quantity of simulation and measured data indicates the proposed approach is not susceptible to sag duration and can make it possible to determine the upstream or downstream location of a voltage sag source. The approach has high accuracy of location.