基于对地电压灵活调控的大型发电机定子接地故障降压消弧方法  

Arc Suppression Method of Large Generator Stator Single-phase Ground Fault Based on Flexible Regulation of Stator to Ground Voltage

作　　者：喻锟[1] 李理[1] 曾祥君[1] 尹项根[2] 刘玉玲 王沾[1] YU Kun;LI Li;ZENG Xiangjun;YIN Xianggen;LIU Yuling;WANG Zhan(State Key Laboratory of Disaster Prevention&Reduction for Power Grid(Changsha University of Science and Technology),Changsha 410014,Hunan Province,China;Hubei Electric Power Security and High Efficiency Key Laboratory(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)

机构地区：[1]电网防灾减灾全国重点实验室(长沙理工大学),湖南省长沙市410114 [2]电力安全与高效湖北省重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2025年第3期911-922,I0009,共13页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52037001,51807012);湖南省教育厅科学研究项目(22A0231)。

摘　　要：为解决大型发电机定子绕组单相接地故障消弧难题,提出基于对地电压灵活调控的大型发电机定子接地故障降压消弧方法。通过在发电机中性点对地支路并联可控电流源,搜索注入电流相量最优幅值及相角,将定子绕组故障点电压抑制为0,破坏故障电弧重燃条件,从而消除接地故障电流,实现定子接地故障消弧。利用PSCAD/EMTDC搭建大型发电机定子单相接地故障模型对所提降压消弧方法进行验证,同时,在动模试验室设置多种定子接地故障场景,进行降压消弧动模试验。仿真与试验结果表明:在不同运行工况及故障条件下,该方法均能有效抑制定子故障点电压,可靠消除故障残流,实现接地故障消弧。该技术有望实现发电机定子绕组接地故障不停电消除,保障发电机长时间安全稳定运行。To solve the single-phase ground fault arc-suppression problem of generator stator windings,the paper proposes voltage-based arc-suppression method based on flexible stator ground voltage control.By controlling the current source which is in parallel with the neutral branch of generator to search for the optimal amplitude and phase of injected current,the voltage of fault point can be suppressed to zero.The strategy can destroy the reignition condition of fault arc and eliminate the fault current,thus realizing the arcsuppression of the stator ground fault at the root.The ground fault model of generator stator is built by PSCAD/EMTDC,to verify the arc-suppression method.Multiple stator ground fault scenarios are set up in the dynamic simulation laboratory to conduct voltage reduction and arc suppression tests.The results show that the method could effectively suppress the stator fault voltage.The method can reliably eliminate fault residual current and achieve grounding fault arc suppression under different operating and fault conditions.The technology is expected to eliminate generator stator winding grounding faults without disrupting power,thereby ensuring long-term safe and stable generator operation.

关 键 词：大型发电机 定子 接地故障 注入电流 电压灵活调控 

分 类 号：TM771[电气工程—电力系统及自动化]