基于节点导纳方程的串联补偿线路双端故障测距算法

由于与串补电容并联的氧化锌非线性电阻(MOV)的非线性特性，一般的故障测距方法对于有串联补偿装置的输电线路不再适用。作者基于传输线的节点导纳方程考虑了故障时串补装置的状态，提出了一种适用于串补线路的故障定位算法。该算法使用相参数(而非序参数)及两端的不同步数据，采用分布参数的线路模型，利用两个子算法搜索故障距离，通过比较两个子算法得到的过渡阻抗值排除伪根，选择一组正确解，从而获得准确的故障位置。仿真分析结果表明了该算法具有较好的定位精度。

A TWO-TERMINAL FAULT LOCATION ALGORITHM FOR SERIES COMPENSATION LINE BASED ON NODAL-ADMITTANCE EQUATION

Because of the nonlinear characteristic of MOVs parallelly connected with series compensation capacitors, usual fault location methods are no more applicable in transmission lines with series compensation devices. On the basis of nodal admittance equation and the state of compensating device while fault occurs, a fault location algorithm suited to series compensation transmission lines is proposed. In this algorithm instead of symmetrical components the phase coordinate parameters and asynchronous data at both terminals are used. Adopting the transmission line model based on distributed parameters the two sub-algorithms are used to search the distance where the fault occurred. By means of comparing the transition impedance from the two sub-algorithms the pseudo-root is excluded and the correct solution is chosen, therefore the accurate faulty position is obtained. Simulation results showed that the fault location of the proposed algorithm is accurate.