基于误差电流的同步调相机励磁系统晶闸管开路故障诊断  

Error-current-based Diagnosis of Open-circuit Faults for Thyristor-based Excitation System of Synchronous Condenser

作　　者：李环宇 王小虎 杨超伟 蔚超 王伟[1] 程明[1] LI Huanyu;WANG Xiaohu;YANG Chaowei;WEI Chao;WANG Wei;CHENG Ming(School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China;Jiangsu Frontier Electric Technology Co.,Ltd.,Nanjing 211102,Jiangsu Province,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]江苏方天电力技术有限公司,江苏省南京市211102

出　　处：《中国电机工程学报》2021年第23期8159-8168,共10页Proceedings of the CSEE

基　　金：国家自然科学基金(面上基金项目)(51977036);江苏方天电力技术有限公司科技项目(KJ202012)。

摘　　要：同步调相机励磁系统晶闸管开路故障会严重威胁特高压直流输电系统的安全稳定运行。为了提高同步调相机励磁系统的可靠性,要求可以快速检测开路故障的发生,并准确定位故障管的位置。为此,提出基于误差电流的同步调相机励磁系统晶闸管开路故障诊断方法。该方法利用支路误差电流进行故障诊断,具有检测速度快、鲁棒性强等优点。首先,计算出支路误差电流;其次,基于支路误差电流得到用于故障检测的变量,以检测故障的发生;最后,通过用于故障定位的标志来定位故障管位置。该方法可以诊断出单管及两管共78种故障情况。实验结果验证了上述故障诊断方法的有效性。The safe and stable operation of ultra-high voltage direct current(UHVDC)transmission system can be significantly affected by open-circuit faults of thyristor-based synchronous condenser excitation system.To improve the reliability of synchronous condenser excitation system,the open-circuit faults should be detected timely and the faulty switches should be located accurately.Hence,an error-current-based diagnosis method was proposed for the open-circuit faults in thyristors of the synchronous condenser excitation system.In the proposed diagnosis method,the branch error currents were utilized,which has the advantages of fast detection speed and strong robustness.First,the branch error currents were calculated.Then,the fault detection variables were obtained by the error currents to detect the fault.Finally,the fault switches were judged by the fault location flags.This method can diagnose all 78 faults in single or double switches.The effectiveness of the proposed diagnosis method is verified by the experimental results.

关 键 词：同步调相机 励磁系统 晶闸管开路故障 故障诊断 误差电流 

分 类 号：TM721[电气工程—电力系统及自动化]