面向接地故障定位的异频信号注入频率估计研究  

Research on frequency estimation of abnormal frequency signal injection for ground fault location

作　　者：王野藤 赵海清 刘梦洋 张文瑞 孙海强 WANG Yeteng;ZHAO Haiqing;LIU Mengyang;ZHANG Wenrui;SUN Haiqiang(State Grid Jiamusi Electric Power Supply Company,Jiamusi 154002,China;Harbin Guoli Electric Co.,Ltd.,Harbin 150028,China)

机构地区：[1]国网佳木斯供电公司,黑龙江佳木斯154002 [2]哈尔滨国力电气有限公司,黑龙江哈尔滨150028

出　　处：《电子设计工程》2025年第2期77-80,85,共5页Electronic Design Engineering

基　　金：国网黑龙江省电力有限公司2021年第二批科技项目(5224152000NR)。

摘　　要：当噪声较大时,注入频率估计性能大幅下降,设计面向接地故障定位的异频信号注入频率估计方法。设计由供电单元、感应单元、数字单元构成的信号采集器,采集接地故障定位的三相电压信号与零序电压信号。分别设计模拟滤波器与数字滤波器,滤波注入信号。通过SDFT算法估计滤波后注入信号的注入频率,实现面向接地故障定位的异频信号注入频率估计。在SNR固定为40 dB的情况下,测试注入频率估计性能。测试结果表明,随着频率的升高,该方法的频率估计结果标准差始终较低,整体变化较为稳定,证明了该方法具有较好的抗噪性能,可以准确估计接地故障定位时注入的异频信号频率。When the noise is high,the performance of injection frequency estimation decreases significantly.Therefore,a method for estimating the injection frequency of hetero frequency signals for ground fault localization is designed.Design a signal collector composed of power supply unit,induction unit,and digital unit to collect three⁃phase voltage signals and zero sequence voltage signals for grounding fault location.Design analog filters and digital filters separately to filter the injected signal.Estimate the injection frequency of the filtered injected signal through the SDFT algorithm,and achieve the estimation of the injection frequency of the abnormal frequency signal for grounding fault location.Test the injection frequency estimation performance with a fixed SNR of 40 dB.The test results indicate that as the frequency increases,the standard deviation of the frequency estimation results is always low,and the overall variation is relatively stable.This method has been proven to have good anti noise performance and can accurately estimate the frequency of the injected abnormal frequency signal during ground fault location.

关 键 词：接地故障定位 信号采集器 模拟滤波器 异频信号 注入频率估计 

分 类 号：TN91[电子电信—通信与信息系统]