核电站500 kV线路故障测距算法的优化与应用

The Optimization and Application of 500 kV Line Fault Location Algorithm in Nuclear Power Plant

目前采用的故障测距算法不适用于带并联电抗器的场景,测距误差较大,线路故障排查时间过长,进而影响核电站机组稳定运行。对现有算法进行了优化,提出一种适用于并联电抗器的新算法,指出存在伪根的可能性,并提出了剔除伪根的原则,得到正确的故障距离,达到精确故障定位的目的。结合核电站500kV线路实际电网模型,对各种类型的故障进行了仿真验证,仿真结果显示优化后算法具有较好的定位精度和准确剔除伪根的能力,最大误差仅为0.730%,满足工程现场需求。

The current fault location algorithm is not suitable for the scene with a shunt reactor.The inaccuracy of measurement could be an obstacle for troubleshooting and then affects the stable operation of nuclear power station units.This paper pointed out the possibility of pseudo-root in the algorithm,proposed a principle of pseudo-root scalping.By using this principle,the obtained fault distance could improve the accuracy of fault location.This work combined with the actual power grid model of 500 kV line in nuclear power plant,various types of failures is simulation verified.The simulation results showed that the optimized algorithm has good positioning accuracy and well ability to eliminate pseudo roots.In experiments,the maximum error is only 0.730%,which can meet the needs of the project site.