一种基于自适应滤波的时域反演故障定位方法

A time reversal fault location method based on adaptive filtering

配电网拓扑复杂的情况给故障定位带来挑战,传统的故障定位方法如阻抗法、行波法等均不能很好地解决问题,因此提出一种基于自适应滤波的时域反演故障定位方法用以解决配电网故障定位问题。此方法通过在观测点处获取故障后的暂态电流信号后经基于自适应滤波的时域反演故障定位方法以最大故障电流信号能量为指标实现故障点的定位。通过对比未使用滤波、高通滤波及自适应滤波3种情况,发现采用自适应滤波滤除工频信号可以达到更高的定位精度。文中设计一种基于宽频电磁传感器的故障定位硬件在环仿真系统,验证所提方法在实际配电网的有效性。

The complex topology of distribution network brings challenges to fault location.Traditional fault location methods,such as impedance method and traveling wave method,cannot solve the problem well.Therefore,a time reversal fault location method based on adaptive filtering is proposed to solve the problem of fault location in distribution network.In this method,the transient current signal is obtained at the observation point,and then the time reversal method based on adaptive filtering,which takes the maximum fault current signal energy as the index,is used to locate the fault point.By comparing the three cases of no filtering,high pass filtering and adaptive filtering,it is found that the adaptive filtering can achieve higher positioning accuracy in filtering power frequency signals.A simulation system of hardware in the loop for fault location based on broadband electromagnetic sensor is designed to verify the effectiveness of the proposed method in the actual distribution network.