基于UKF和SPRT小电流单相接地故障选线方法  

Single-phase Ground Fault Line Selection Approach for Small-current System Based on UKF and SPRT

作　　者：付华[1] 赵珊影 孟祥云[1] FU Hua;ZHAO Shanying;MENG Xiangyun(Faculty of Electrical and Control Engineering,Liaoning Technical University,Huludao 125105,China)

机构地区：[1]辽宁工程技术大学电气与控制工程学院

出　　处：《电源学报》2019年第5期137-145,共9页Journal of Power Supply

基　　金：国家自然科学基金资助项目（51274118）;辽宁省重点实验室资助项目(LJZS003)~~

摘　　要：为解决现有小电流系统单相接地故障选线方法在准确率和可靠性等方面存在的问题,提出了一种基于无迹卡尔曼滤波UKF(unscented Kalman filter)和序贯概率比检验SPRT(sequential probability ratio test)的小电流系统单相接地故障选线方法。首先建立故障线路的无迹卡尔曼滤波数学模型;再利用无迹卡尔曼滤波对系统故障特征信息进行跟踪与预测;通过序贯概率比方法,利用新信息观测值与实际量测值的残差值,计算似然比;构造故障判据,从而快速地选出故障线路。ATP-EMPT和Matlab的大量仿真实验结果表明该方法具有较高的准确率和可靠性。To solve the existing problems in the single-phase ground fault line selection approach for small-current system such as lower accuracy and poor reliability,a single-phase ground fault line selection approach for small-current system is proposed based on unscented Kalman filter(UKF)and sequential probability ratio test(SPRT).First,a mathe-matical model of fault line is established based on UKF.Then,UKF is used to track and predict the characteristic information of system fault.The resulting residuals between the observed value of new information and the actual mea-sured value are used to calculate the likelihood ratio using the sequential probability ratio method.Moreover,a fault criterion is constructed,which can be used to quickly select the fault line.Results of a large number of simulations using ATP-EMPT and Matlab show that the proposed method has higher accuracy and reliability.

关 键 词：小电流系统 单相接地故障 无迹卡尔曼滤波 序贯概率比检验 似然比 故障选线 

分 类 号：TM77[电气工程—电力系统及自动化]