基于广域同步测量技术的煤矿高压电网故障区段定位算法

Fault section locating algorithm for coalmine high-voltage power network based on wide area synchronized measurement technology

广域同步测量技术可实现全网动态参量数据的快速共享,为解决单相接地故障的在线定位问题提供了新的契机。给出了接地故障时刻各馈线支路上零序电流的时域特征方程,分析得出健全线路与故障线路间零序电流暂态脉冲极性相反的结论,据此提出实现故障区段定位的优化矩阵算法。该算法按照电网拓扑连接关系建立网络描述矩阵,依据各开关节点的暂态脉冲极性信息构建故障特征矩阵,最终利用优化判断准则完成故障区段的准确定位,ATP-EMTP算例仿真验证了该算法的优越性和可行性。论述了基于广域同步测量技术实现煤矿高压电网单相接地故障区段定位的方案,包括分层式测控系统结构和故障在线定位的实施过程。

The wide area synchronized measurement technology can realize a rapid sharing of whole grid dynamic parameters and thus provide a new opportunity to resolve the problem of single-phase earth fault online location. The time-domain characteristic equations of each feeder zero-sequence current at grounding fault time were given. Then the analysis shows that polarity of zero-sequence transient current in fault line is opposite to those in healthy feeders,which is the basis for fault section locating optimal matrix algorithm. A network description matrix depicted grid topology was constructed,and a fault feature matrix was proposed based on the transient pulse polarity of feeder switches. Finally the fault sections could be accurately identified by optimal judgment criterion. The superiority and feasibility of this algorithm was proved by ATP-EMTP simulation and the case analysis results. The implementation scheme of single-phase earth fault section location in coalmine high-voltage power network based on wide area synchronized measurement technology was discussed,including the structure of layered monitoring system and the realization of grounding fault online location.