配电网单相接地故障选线检测仿真

摘要

When single-phase ground fault occurs in distribution grid,fault signal is weak and can not be fully captured,which leads to low reliability and speed.Combining the fastness of S-transform to extract the zero-sequence current signal and the sensitivity of e chaotic oscillator system to the weak periodic signal,we propose a method of fault line selection for S-transform and chaotic oscillator subsystem.It can quickly extract the zero-sequence current signal amplitude-frequency characteristics and phase-frequency characteristics and phase change principle chaotic oscillators to determine the fault line.The simulations were carried out to simulate the failure of each line under different conditions.The simulation results show the feasibility of the algorithm,and the reliability and speed of fault line selection are improved.%配电网中发生单相接地故障时,故障信号不能完全捕捉以及故障信号微弱导致选线的可靠性和快速性不高的问题,利用单一的稳态或者暂态选线方法均存在一定的局限性和适用性.将S变换提取零序电流信号的快速性和混沌振子系统对微弱周期信号的敏感性相结合,提出了一种S变换和混沌振子系统的故障选线方法.可以快速的提取出零序电流信号幅频特性和相频特性并利用混沌振子系统的相变原理确定故障线路.通过仿真软件对各条线路在不同条件下进行故障模拟,仿真结果证明了算法的可行性,提高了故障选线的可靠性和快速性.