基于小波分析的输电线路单端故障定位方法  

Single terminal fault location method of transmission line based on wavelet analysis

作　　者：郑武略 张富春[1] 张鑫 袁文俊 王宁[1] ZHENG Wulue;ZHANG Fuchun;ZHANG Xin;YUAN Wenjun;WANG Ning(EHV Power Transmission Company,China Southern Power Grid Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司,广东广州510000

出　　处：《电子设计工程》2024年第13期135-139,共5页Electronic Design Engineering

基　　金：南方电网科技项目(CGYKJXM20210305)。

摘　　要：为精准判别输电线路单端故障的位置,提出基于小波分析的输电线路单端故障定位方法。联合零序电压与故障绕组系数,求解输电转矩指标的取值范围,完成对单端故障暂态特征量的计算。分别从连续小波变换、离散小波变换两方面来完善小波分析理论,获取故障暂态特征量指标的实际取值范围,并以此为基础,确定暂态定位参数的具体取值结果,实现对输电线路单端故障行为的全局定位。实验结果表明,小波分析理论作用下,单端故障节点处最大电压检测差值为5 V、最大电流检测差值为0.1 A,误差较小,符合精准判别输电线路故障的应用需求。In order to accurately identify the location of single-end fault of transmission lines,a singleend fault location method based on wavelet analysis is proposed.Combining zero-sequence voltage and fault winding coefficient,the value range of transmission torque index is solved,and the calculation of single-terminal fault transient characteristics is completed.The wavelet analysis theory is improved from two aspects of continuous wavelet transform and discrete wavelet transform,and the actual value range of fault transient characteristic index is obtained.Based on this,the specific value results of transient location parameters are determined to realize the global location of single-terminal fault behavior of transmission lines.The experimental results show that under the action of wavelet analysis theory,the maximum voltage detection difference at the single-end fault node is 5 V,the maximum current detection difference is 0.1 A,and the error is small,which is in line with the application requirements of accurate identification of transmission line faults.

关 键 词：小波分析 输电线路 单端故障定位 零序电压 绕组系数 输电转矩 

分 类 号：TN102[电子电信—物理电子学]