一种基于区段判别的混合线路组合行波定位方法

为了提高传统组合行波测距方法的测距精度,分析了混合输电线路故障后故障行波的传播过程以及发生折射、反射的情况,并提出一种基于区段判别的混合线路组合行波定位方法。首先利用故障初始行波到达线路两侧的时间差来判定故障区段,由单端法给出准确的测距结果,然后通过线路两端采集到的时间由单端原理给出准确的测距结果,消除了双端法受线路给定长度误差以及同步时钟误差问题的影响,不需要对第二次到达母线侧的故障行波进行假设计算,简化了传统的组合行波测距方法,提高了传统组合行波测距法的测距精度。PSCAD仿真表明,所提出的高压混合输电线路组合行波测距方法是可行的,与传统组合行波测距方法相比,测距精度明显提高。

A Location Method for Hybrid Line Co mbination Traveling Wave Based on Segment Discrimination

To improve the accuracy of traditional combination traveling wave location method,this paper analyzes the propagation process of the traveling wave of fault after its occurrence on a hybrid transmission line,as well as its refraction and reflection,and proposes a location method for hybrid line combination traveling wave based on segment discrimination.Firstly,the difference between time of arrival of initial traveling wave of the fault at the two sides of the line is used to determine the fault segment,and an accurate location result is given in the single-end method.Then,accurate location result is given in the single-end principle through the time collected from both ends of the line.This approach eliminates the influence of errors from given length and from synchronization clock in the double-end method,and does not need an assumption calculation of the fault traveling wave arriving at the bus side for the second time,thus simplifying traditional combination traveling wave location method and raising its location accuracy.PSCAD simulation shows that the proposed combination traveling wave location method for high-voltage hybrid transmission lines is feasible and has a much higher location accuracy than the traditional combination traveling wave location method.