关联维在高压输电线故障检测与测距中的应用

Application of Correlation Dimension in Fault Detection and Location of Transmission Line

高压输电线路由于跨度大、所经之处自然环境复杂,因而故障率较高。为及时发现故障并准确定位,可以有效地减少维护的工作量、提高线路的运行水平。能准确、及时地故障测距具有突出的经济意义和社会效益。根据双端行波法的测距原理,采用关联维分析方法对输电线路进行故障检测与测距。通过计算输电线路电压行波的关联维数进行故障检测,进而采用基于变步长的关联维突变时刻搜索算法捕捉故障发生时行波到达线路两端的时间差Δt,最后采用双端行波测距法进行故障测距。仿真结果满足电力系统对精确故障定位的要求,验证了方法的有效性。

Because of the large - span of transmission line and the complex natural environment, so the fault rate of transmission line is high. Detecting and locating fault in time is an effective way to reduce the maintain workload and improve the running level of transmission line. So detecting and locating fault accurately possesses the economic and social benefits. In the paper, based on the double terminal method of traveling wave, the correlation dimension analysis method is applied to fault detection and location of transmission line. First of all, the voltage traveling - wave correlation dimension of transmission lines is calculated for fault detection, and then the algorithm which search is the moment when the mutation correlation dimension happens based on variable step size is used to capture the moment of failure occurred, and the double terminal method of traveling wave is used for fault location. The simulation results meet the requirement of the fault location of power system, and the effectiveness of the method is verified.