基于双端电气量的串补线路故障测距新算法

Fault location based on dual-terminal electrical variables for line with series compensation

目前带串补装置的高压线路进行双端测距时需要进行真伪根判断,对此提出了一种基于双端电气量的串补线路故障测距新算法。分别建立串补电容两侧的线路故障模型,在发生故障后,首先识别2个模型的参数,然后计算2个模型的误差来判断故障点相对串补电容的位置,再利用相应模型的参数进行故障测距。该算法不需判断真伪根,有利于快速准确地定位故障。EMTP仿真结果显示,所提算法不受金属氧化物压敏电阻(MOV)、系统阻抗、故障类型和故障位置的影响,测距误差都在0.6%以内。

Since the existing dual-terminal fault location algorithms of high-voltage line with series compensation have to expel the pseudo-root,a fault location algorithm based on dual-terminal electrical variables is proposed. Two fault models are built for faults location at different sides of compensation capacitor. When fault occurs,the parameters of both models are identified,both model parameter errors are calculated to determine at which side of the compensation capacitor the fault locates ,and the fault location is accurately confirmed according to the parameters of the corresponding model. Without pseudo-root exclusion,the proposed algorithm locates the fault quickly and accurately. Simulative results with EMTP show that,with the location error less than 0.6%,the proposed algorithm is immune to MOV（Metal Oxide Varistor） ,system resistance ,fault type and fault location.