微型电脑应用

单相接地故障定位可以判断配电网的运行是否安全。为了提高配电网单相接地故障的定位精度，提出一种基于大数据与混合禁忌搜索算法的配电网单相接地故障定位方法。利用配电网单相接地故障样本，构建单相接地故障的空间矩阵。基于大数据技术的关联分析原则，计算参考向量元素和比较向量元素的关联系数。通过故障信号分解，得到单相接地故障的细节信号和平滑信号。结合关联度排序，确定配电网单相接地故障线路。对配电网中各输电线路的电流进行归一化处理获取零序电流与单相接地故障的突变量，并根据突变量的分解情况，提取配电网单相接地故障线路特征。通过计算故障点的暂态零序电流，将禁忌搜索算法与最近邻算法相结合，在引入惩罚系数的基础上，更新禁忌列表和惩罚系数，获得暂态零序电流的幅值，完成单相接地故障的精准定位。实验结果表明，所提方法可以确定配电网单相接地故障的位置，并将定位的容错率提高到94%以上。

Single-phase grounding fault location can determine whether the operation of distribution network is safe. In order to improve the accuracy of single-phase grounding fault location in distribution network, a method of single-phase grounding fault location in distribution network based on big data and hybrid tabu search algorithm is proposed. The method uses the distribution network single-phase ground fault samples to construct a space matrix of single-phase grounding fault. Based on the correlation analysis principle of big data technology, the correlation coefficients of reference vector elements and comparison vector elements are calculated. Through fault signal decomposition, the detailed signal and smooth signal of single-phase grounding fault are obtained. The distribution network single-phase grounding fault line is determined by combining the correlation degree ranking. The current of each transmission line in the distribution network is normalized to obtain the sudden-change of zero-sequence current and single-phase grounding fault, and the characteristics of single-phase grounding fault line in the distribution network are extracted according to the decomposition of the sudden-change. By calculating the transient zero-sequence current at the fault point, the tabu search algorithm is combined with the nearest neighbor algorithm. On the basis of introducing the penalty coefficient, the tabu list and penalty coefficient are updated to obtain the amplitude of the transient zero-sequence current and complete the accurate location of single-phase grounding fault. The experimental results show that the proposed method can determine the location of single-phase grounding fault in distribution network and improve the fault tolerance rate to more than 94%.