基于综合Hausdorff距离的小电流接地故障选线

Fault line selection in small current grounding system based on composite Hausdorff distance

将Hausdorff距离引入小电流接地系统故障选线,利用故障后暂态零序电流波形的相似性度作为故障选线判据,提出改进后的综合Hausdorff距离算法计算暂态零序电流的波形相似度,进行故障线路筛选。采用MATLAB/SIMULINK软件对不同故障条件分别进行仿真。实验结果表明,综合Hausdorff距离算法不受接地电阻、故障电压初相角、短路距离以及电网结构等因素的影响,具有准确性高,抗噪声能力强,检测速度快和对采样频率限制低的优点。

The Hausdorff distance is introduced into fault line selection in a small current grounding system. This paper proposes an improved composite Hausdorff distance method,which adopts similarity measurement based on transient zerosequence currents signals as criteria to conduct fault line selection. MATLAB/SIMULINK software is used to simulate different fault conditions,and the results show that Composite Hausdorff distance method has the advantages of high accuracy,strong noise immunity,fast detection speed and low limit of sampling frequency,which is not affected by grounding resistance,fault voltage initial angle,short circuit distance and power grid structure.