| 引用本文: | 韩海安,张竹,王晖南,李红斌,薛建立,邵龙.基于主元分析的电容式电压互感器计量性能在线评估[J].电力自动化设备,2019,39(5): |
| HAN Haian,ZHANG Zhu,WANG Huinan,LI Hongbin,XUE Jianli,SHAO Long.Online metering performance evaluation of capacitor voltage transformer based on principal component analysis[J].Electric Power Automation Equipment,2019,39(5): |
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| 摘要: |
| 电容式电压互感器(CVT)在运行过程中误差稳定性不高，易出现计量误差超差现象，直接影响电能计量的准确性。现有的利用标准电压互感器定期离线校验的方式存在过修和欠修等问题，已不适应智能变电站对关键设备在线监测的运行要求。提出了一种基于主元分析的在运CVT计量性能状态评估方法，采集三相CVT输出的二次模拟信号，利用主元分析的方法将电网一次信号波动和CVT自身异常造成的计量偏差相互分离，提取运行过程中测量数据的特征统计量，分析统计量的变化评估在运CVT的计量性能。实验结果表明所提方法可准确监测0.2级CVT的计量偏差状态，实现在运CVT计量性能的准确评估。 |
| 关键词: 电容式电压互感器 在线评估 计量性能 误差 主元分析 |
| DOI：10.16081/j.issn.1006-6047.2019.05.030 |
| 分类号:TM451 |
| 基金项目: |
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| Online metering performance evaluation of capacitor voltage transformer based on principal component analysis |
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HAN Haian1, ZHANG Zhu2, WANG Huinan1, LI Hongbin2, XUE Jianli1, SHAO Long1
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1.Metrology Center of State Grid Shanxi Electric Power Company, Taiyuan 030032, China;2.School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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| Abstract: |
| The error stability of CVT(Capacitive Voltage Transformer) is not high in the operation process, and the metering error is easy to be out of tolerance, which directly affects the accuracy of electric power metering. The exis-ting off-line calibration methods using standard voltage transformer can not meet the requirements of intelligent substation for on-line monitoring of key equipment due to their problems such as over inspection, under inspection and so on. A metering performance evaluation method of CVT is proposed based on principal component analysis. The secondary analog signals of three-phase CVT are collected. The metering deviations caused by the primary signal fluctuations of power grid and the anomaly of CVT itself are separated by using the principal component analysis method. The characteristic statistics of measured data in the operation process are extracted, and the metering performance of CVT is evaluated by analyzing the change of statistics. The experimental results show that the proposed method can accurately monitor the metering deviation of CVT with class 0.2 and achieve accurate measurement performance evaluation of in-service CVT. |
| Key words: capacitor voltage transformer online evaluation metering performance errors principal component analysis |
