基于单端电气量的故障测距算法

为了提高利用单端电气量测距的精度，在对基于单端电气量的正序电流迭代测距法进行分析的基础上，利用负序网计算本端系统阻抗，并提出了利用系统正常运行时参数估算对端系统正序阻抗的方法，从而使测距算法对系统的运行方式具有一定的自适应性．为了防止测距结果不收敛或收敛太慢，还提出了加速收敛的方法（Alkten法）、Alkten法的应用提高了测距的稳定性．仿真结果表明：该测距方法可以使测距误差在1％以下，且实现简单，不需要另外增加硬件投资。

Fault Location Algorithm Based on Signal Terminal Electrical Data

To enhance the fault location precision of positive-sequence iterative method based on signal terminal electrical data,a method to calculate the impedance of near system using the negative-sequence network is ap- plied and a means to calculate positive-sequence impedance of opposite side system is presented.The parame- ters in normal case of power system are used to obtain positive-sequence of opposite system impedance,which makes the fault location be adaptive to the run states of power system.To prevent the iterative process from non- converging or converging too slowly,the accelerating convergence (Alkten) is put forward,which can improve the stability of fault location.The simulation results show that the location error is under 1% and no extra hard- ware is needed.