适用于单/双回线的双端非同步故障测距方法

Two?terminal Nonsynchronized Fault Location Algorithms for Single/Double Transmission Lines

单/双回线之间存在线间互感、跨线故障等特征差异,严重限制了单回线测距原理在双回线路中的应用。文中提出了一种适用于单/双回线的双端非同步故障测距方法。首先基于单回线网络结构,利用双端电压幅值比推导出双端非同步的故障测距方程。然后从双回线的网络结构和非对称参数着手,基于星角变换和六序变换原理分别建立单/双回线之间的联系桥梁,使基于单回线所提测距原理在双回线测距中能得以应用。仿真验证表明所提方法继承了双端工频测距法的优点,且无需双端数据同步,在单/双回线全线环境下均具有较高的测距精度,适用范围广。

There exists characteristic differences between single/double circuit lines,such as line to line mutual inductance,cross line fault,etc.Which seriously restrict the application of single loop distance measurement principle in double circuit lines.This paper presents a research scheme of two terminal asynchronous fault location suitable for single/double circuit lines,or for single circuit and double circuit line at the same time.First,derive the fault location equation of two terminal asynchronous fault using double ended voltage amplitude ratio based on single loop network structure.Then,according to the amplitude ratio of voltage on both ends,a new location equation is given.Proceed from the network structure of double circuit line and asymmetric parameter and,based on equivalent transformation and six sequence transformation,relate single circuit line to double circuit line to enable the algorithm based on single circuit line to be used in double circuit line.Simulation results show that the proposed fault location method,even without synchronous sampling of two terminals,still has the advantages of two-terminal location of high precision on single and double circuit line.