基于因子分析与统计学技术的保护测量回路误差评估

Protection Loop Error Measurement Based on Factor Analysis and Statistics Technology

为提高保护测量回路可靠性和保证电力系统安全运行,须及时解决保护装置的测量误差问题。针对保护测量回路,构建了基于因子分析与统计学技术的误差评估方法。该方法基于三相数据间具有线性强相关性的基本原理,对保护测量回路获取的三相电流进行了因子分析,构建了误差启动判据;基于因子分析的结果,采用统计学技术中的3种经典统计量和控制阈值实现了误差源定位,达到了误差小于5%的评估精度。仿真结果证明了基于因子分析与统计学技术的保护测量回路误差评估方法的有效性与准确性。

In order to improve the reliability of the protection measurement circuit and ensure the safe operation of the power system,which requires the measurement error of the protection device to be solved in time.An error evaluation method based on factor analysis and statistical techniques is constructed for the protection measurement circuit in this paper.Based on the principle that there is strong linear correlation between the three phase data,the three-phase current obtained by the protection measurement circuit is analyzed and the error starting criterion is established.Based on the results of factor analysis,three classical statistics and control threshold in statistical techniques are used to locate the error source,and the evaluation accuracy of error less than 5%is achieved.The effectiveness and accuracy of this method are proved by simulation results.This work is supported by National Natural Science Foundation of China(No.52077120).