基于主成分分析的CVT误差状态评估  

CVT Error State Assessment Based on Principal Component Analysis

作　　者：郭丽娟 高宝琪 陈丽 门艳 崔翔 GUO Lijuan;GAO Baoqi;CHEN Li;MEN Yan;CUI Xiang(State Grid Xinjiang Maintenance Co.,Ltd.,Urumqi 830002,China;State Grid Xinjiang Electric Power Co.,Ltd.,Urumqi 830063,China;Economic and Technological Research Institute of State Grid Xinjiang Electric Power Co.,Ltd.,Urumqi 830002,China)

机构地区：[1]国网新疆检修公司,乌鲁木齐830002 [2]国网新疆电力有限公司,乌鲁木齐830063 [3]国网新疆电力有限公司经济技术研究院,乌鲁木齐830002

出　　处：《电力电容器与无功补偿》2023年第6期73-78,共6页Power Capacitor & Reactive Power Compensation

摘　　要：电容式电压互感器(CVT)的误差准确度是CVT重要的性能参数,但CVT的误差准确度通常受多种因素影响。针对目前的CVT误差状态评估离线法不能反映CVT在线实际工况,在线评估法尚不成熟的问题,本文提出了利用主成分分析的CVT误差状态在线评估方法。该方法首先将CVT的误差状况映射到残差空间中并计算测量数据的平方预测误差(SPE)统计量,然后根据SPE统计量和控制线判断CVT的误差状态。最后通过实例分析,结果表明了本文方法对于CVT误差在正常、突变和渐变等状况下均能进行准确评估,为CVT误差状态的在线准确评估提供了理论参考。The error accuracy of capacitor voltage transformer(CVT)is an important performance parame-ter of CVT.However,the error accuracy of CVT is usually affected by many factors.As for the issue that the present error state assessment offline method of CVT cannot reflect the online actual working conditions of CVT and the on line assessment method is not mature,the on line assessment method of CVT error state using main principal component analysis is proposed in this paper.The method maps the error state of the CVT to the residual subspace and calculates the squared prediction error(SPE)statistic of the measured data at first.Then,the error state of CVT is judged in accordance with the SPE statistics and the control line.The results of the case analysis show that the method proposed in this paper can assess the CVT error under normal,sudden and gradual conditions accurately,which provides a theoretical reference for online accurate assessment of CVT error state.

关 键 词：电容式电压互感器 误差状态 在线评估 主成分分析 

分 类 号：TM451.2[电气工程—电器]