基于模式识别的单端行波测距研究

母线采用第二类接线方式,考虑母线分布电容,建立输电线路模型。对行波线模分量进行小波变换以及模极大值处理,利用模式识别,建立隶属度函数,对故障初始行波、故障点反射波、对端母线反射波进行标定,得到1组时刻组合(t1m,t2m,t3m)。经过单端行波测距计算,获得2个测距结果x和(L-x),其中1个测距结果为伪根,给出去除该伪根的方法。理论分析和EMTP仿真验证,该文测距方法不受波速影响,并且具有很高的测距精度,较好的抗干扰性和抗过渡电阻能力。

Single Terminal Travelling Waves Location Based on Pattern Recognition

Using bus wiring of the second kind and considering the transformer and bus distribution capacitance,a transmission line model is established.Aerial mode component of travelling wave is decomposed into wavelet coefficients by using wavelet transform and then further processed by modulus maxima.Making use of pattern recognition,a membership function is establish for calibrating the initial wave-front of the travelling wave,the reflection wave from fault point,and the reflection wave from the remote bus in order to get a set of moments(t1m,t2m,t3m).Through fault location,two corresponding fault distances x and(L-x) are achieved,in which one is false.And the removal method of the false root is given.Theoretical analysis and EMTP simulation indicate that the present location method can avoid the effect of wave velocity,and gains high location accuracy,better anti-jamming and anti-transition resistance performances.