通用行波测距修正方法

Generalized Amending Method on Fault Location Algorithms Based on Traveling Waves

由于故障点发生的位置随机,当采样间隔对应的距离与实际故障距离不满足整数倍关系时,将出现截断误差。为此,分析截断误差的生成机制,并提出了相应的修正方法。以双回线双端行波测距算法为例,基于信号模极大值确定电流行波信号到达母线的时间。在较低的采样率条件下,利用简单求导方法即可将定位误差限制在一个采样间隔内,该修正方法能大大提高测距精度。当采样率很高时,如果前置的波头定位算法能将误差定位在一个采样间隔内时,本修正算法依然有效。大量的仿真结果验证了修正方法的有效性和可行性。

Due to the random nature of the fault location,the truncated error is inevitable when the number that the real fault distance divided by the distance corresponding to one sampling interval is not an integer.So the mechanism of truncated error was analyzed and the corresponding revision method was proposed.Taking the fault location issue of double-circuit parallel transmission lines as an example,the arriving time of the current traveling wave can be determined by the modal current maximum.The error of fault location can be limited up to within one sampling interval by means of derivative calculation on wavehead in the condition of low sampling rate.In this case,the accuracy of fault location can be improved greatly.This algorithm is still appropriate if the error of fault location can be limited up to within one sampling interval by means of the preset wavehead location algorithm.A variety of simulation test results verified the correctness and feasibility of the proposed method.