基于因子分析法的电子式电压互感器误差状态在线评估  

Factor analysis based online assessment of EVT error state

作　　者：石永军 杨明泽 贠振兴 李青宏 李昊洋 兰芳 SHI Yongjun;YANG Mingze;YUN Zhenxing;LI Qinghong;LI Haoyang;LAN Fang(Jinchang Power Supply Company,State Grid Gansu Electric Power Company,Jinchang 737100,China;School of Computer Science,Hunan University of Technology,Zhuzhou 412007,China;College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China)

机构地区：[1]国网甘肃省电力公司金昌供电公司,甘肃金昌737100 [2]湖南工业大学计算机学院,湖南株洲412007 [3]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《现代电子技术》2023年第6期123-128,共6页Modern Electronics Technique

基　　金：国网甘肃省电力公司管理科技项目资助(522704220001)。

摘　　要：电子式电压互感器由于结构复杂且工作环境恶劣,长时间运行后精度会大幅降低,影响电力系统的安全可靠性和电能贸易交易的公平性。针对传统的离线校验方法长时间停电需要标准互感器的缺点,文中提出一种基于因子分析法的电子式电压互感器误差状态在线评估方法。利用SPSS软件实现KMO检验和Bartlett球形检验,验证三相电子式电压互感器的二次输出数据适用于因子分析。在系统正常运行下实现模型训练,利用因子算法分离出特殊因子电子式电压互感器误差信号,建立特殊因子的Q统计量阈值;通过计算Q统计量的变化实现误差状态检测,通过Q统计量的贡献率实现三相电子式电压互感器异常准确定位。试验结果表明,所提方法可实现电子式电压互感器计量误差0.1%的在线评估,满足传统定期离线校验0.2级计量精度的评估标准,可为互感器在线监测提供新思路。Due to the complex structure and bad working environment,the accuracy of EVT(electronic voltage transformer)will be seriously reduced after long⁃time operation,which will affect the safety and reliability of power system and the fairness of power trade.In allusion to the disadvantage that the traditional off⁃line calibration method needs standard transformer for long⁃time power failure,a method of factor analysis based on⁃line evaluation of EVT error state is proposed.KMO test and Bartlett spherical test are realized by means of SPSS software to verify that the secondary output data of three⁃phase EVT is suitable for factor analysis.The model training is realized under the normal operation of the system.The error signal EVT with special factor is separated by means of the factor algorithm,and the threshold value of Q statistic of special factor is established.The error state detection is realized by calculating the change of Q statistics,and then the abnormal location of three⁃phase EVT is realized by mean of the contribution rate of Q statistics.The testing results show that the proposed method can realize the online evaluation EVT measurement error of 0.1%,and meet the traditional evaluation standard of 0.2 level measurement accuracy,which can expand a new idea for EVT on⁃line monitoring.

关 键 词：电子式电压互感器 误差状态 KMO检验 Bartlett球形检验 因子分析 Q统计量 SPSS统计软件 在线评估 

分 类 号：TN722.74-34[电子电信—电路与系统]