基于等效漏电感参数辨识的磁控式并联电抗器匝间故障保护方案  

Protection Scheme Based on the Identification of Equivalent Leakage Inductance Against Turn-to-Turn Fault of Magnetically Controlled Shunt Reactor

作　　者：刘校销 郑涛[1] 黄婷 Liu Xiaoxiao;Zheng Tao;Huang Ting(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Source North China Electric Power University,Beijing 102206 China;Nanchang Power Supply Company State Grid Jiangxi Electric Power Company,Nanchang 330002 China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]国网江西省电力有限公司南昌供电分公司,南昌330002

出　　处：《电工技术学报》2020年第1期134-145,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金（51677069）;国家重点研发计划（2016YFB0900600）资助项目

摘　　要：磁控式并联电抗器(MCSR)可实现容量大范围平滑调节,是解决超/特高压输电系统无功及电压控制难题的有效措施。匝间短路是MCSR的一种常见故障,由于其特殊的铁心结构以及绕组联结方式,故障绕组和非故障绕组之间存在复杂的电磁耦合关系,MCSR匝间故障的准确判别具有一定挑战性。针对该问题,提出一种基于等效漏电感参数辨识的MCSR匝间故障保护方案。基于MCSR网侧与控制侧、补偿侧的电压回路等效电路,推导得到相应的等效漏电感参数辨识模型,通过递推最小二乘法实时辨识等效漏电感参数,利用其在匝间故障时变化明显以及故障相与非故障相的差异特征,构建基于等效漏电感参数变化率和三相差异度的匝间保护方案。此外,该方案还可以根据故障后等效漏电感参数的大小关系,进一步实现故障绕组的判别,最后基于Matlab/Simulink的大量仿真,验证了该方案的有效性。Due to the advancement of large-scale continuously regulated capacity,magnetically controlled shunt reactor(MCSR)is one of the key elements used in EHV/UHV transmission systems for reactive power compensation and overvoltage suppression.The turn-to-turn fault is a common fault of MCSR,however due to its special core structure and winding connection mode,there is a complex electromagnetic coupling relationship between the fault winding and the non-faulty winding,which makes the accurate identification of the turn-to-turn fault more challenging.In order to solve this problem,a novel protection scheme against turn-to-turn fault of MCSR based on the identification of equivalent leakage inductance was proposed.Based on the equivalent circuit of voltage loops of power winding and control winding and compensation winding,parameter identification model of the corresponding equivalent leakage inductance was derived,and then solved by recursive least squares method.A new protection scheme based on the variation rate of equivalent leakage inductance parameters and the difference of three-phase equivalent leakage inductance was constructed.In addition,the scheme can further detect the fault winding based on the magnitude relationship of the equivalent leakage inductance parameters after the fault occurs.The effectiveness of the protection scheme was verified through simulation analysis based on Matlab/Simulink.

关 键 词：磁控式并联电抗器 漏电感参数辨识 递推最小二乘法 匝间故障 保护方案 

分 类 号：TM474[电气工程—电器]