基于单相行波选线法的灵敏度和可靠性研究

Research on Sensitivity and Reliability Based on Single-phase Traveling Wave Line Selection Method

针对现有行波选线法存在判据灵敏度不高、可靠性低的问题,提出了一种新的单相行波选线方法。首先利用二进离散小波变换捕获单相故障电流行波,由于健全支路的故障初始行波能量是故障支路初始行波能量的分流,故可以利用行波能量大小关系选出故障线路,并利用本文提出的“N-1选线法”合理构造选线判据,使得判据更加灵敏可靠,还具有耐高阻性能。通过Simulmk仿真和数学推导均可以证明理论正确。本文提出的新方法可以扩大了现有行波选线方法的适用范围,提高了现有行波选线方法的正确率。

At present,the existing traveling wave line selection method has the problems of low sensitivity and low reliability,so this paper proposes a new single-phase traveling wave line selection method.First,the binary discrete wavelet transform is used to capture the single-phase fault current traveling wave.Since the fault initial traveling wave energy of the sound branch is the shunt of the initial branch traveling wave energy of the fault branch,the fault line can be selected using the relationship of the magnitude of the traveling wave energy,and using the"N-1 line selection method"proposed in this paper to rationally construct the line selection criterion,the criterion is more sensitive and reliable,and it has high resistance resistance.This paper can prove the theory is correct through simulink simulation and mathematical derivation.The new method proposed in this paper can improve the applicable scope of the existing traveling wave line selection method and improve the accuracy of the line selection method.