变速抽水蓄能机组转子接地故障精确定位方法  

Accurate location method of rotor grounding fault of variable speed pumped storage unit

作　　者：乔健 尹昕 王义凯[1] 尹项根[3] 刘之畅 戴志辉[1] QIAO Jian;YIN Xin;WANG Yikai;YIN Xianggen;LIU Zhichang;DAI Zhihui(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Baoding 071000,China;School of Automation,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华北电力大学新能源电力系统全国重点实验室,河北保定071000 [2]武汉理工大学自动化学院,湖北武汉430070 [3]华中科技大学强电磁工程与新技术国家重点实验室,湖北武汉430074

出　　处：《电力自动化设备》2025年第3期95-101,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52407100)。

摘　　要：变速抽水蓄能机组的转子绕组是特殊的三相绕组结构,不仅令传统的转子接地故障定位方法不再适用,还增加了接地故障选相问题。为此,提出了一种变速抽水蓄能机组转子绕组接地故障定位方法。分析了转子槽导体感应电势的产生机理,总结了转子绕组电势的相位特征与运行工况的关系,利用分段函数精确解析了绕组电势的幅值和相位变化规律。在此基础上,基于相量轨迹分析提出了一种可靠的转子接地故障选相方法。进一步,根据中性点对地电压相量、故障点对地电压相量及故障绕组电势相量的几何关系,构造了转子接地故障定位的最优化模型,通过求解可实现转子接地故障的精确定位。仿真和实验结果验证了所提方法的有效性。The rotor winding of variable speed pumped storage unit(VSPSU)is a special three-phase winding structure,which not only makes the traditional rotor grounding fault location method no longer applica⁃ble,but also increases the problem of grounding fault phase selection.Therefore,a grounding fault location method for rotor winding of VSPSU is proposed.The generation mechanism of the induced potential of the rotor slot conductor is analyzed,and the relationship between the phase characteristics of the rotor winding potential and the operating conditions is summarized.The piecewise function is used to accurately analyze the amplitude and phase variation of the winding potential.On this basis,a reliable phase selection method for rotor grounding fault is proposed based on phasor trajectory analysis.Furthermore,according to the geo⁃metric relationship of neutral point-to-ground voltage phasor,fault point-to-ground voltage phasor and fault winding potential phasor,the optimization model of ground fault location is constructed,and the precise loca⁃tion of rotor grounding fault can be realized by solving.Results of simulation and experiment verify the effectiveness of the proposed method.

关 键 词：变速抽蓄机组 转子接地故障 故障选相 故障定位 绕组电势分布 

分 类 号：TM771[电气工程—电力系统及自动化]