基于谐波测量阻抗偏差的接地极线路保护新方法  

New method of grounding electrode line protection based on harmonic measurement impedance deviation

作　　者：李小鹏 张钥朗 卢继平[3] 滕予非 庄祎 LI Xiaopeng;ZHANG Yueang;LU Jiping;TENG Yufei;ZHUANG Yi(State Grid Sichuan Electric Power Research Institute,Chengdu 610041,China;Power Internet of Things Key Laboratory of Sichuan Province,Chengdu 610041,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,School of Electrical Engineering,Chongqing University,Chongqing 400044,China;State Grid Xuzhou Power Supply Company,Xuzhou 221005,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都610041 [2]电力物联网四川省重点实验室,四川成都610041 [3]重庆大学电气工程学院输配电装备及系统安全与新技术国家重点实验室,重庆400044 [4]国网徐州供电公司,江苏徐州221005

出　　处：《电力自动化设备》2023年第3期131-137,共7页Electric Power Automation Equipment

基　　金：四川省杰出青年科技人才项目(2021JDJQ0035)。

摘　　要：针对目前特高压直流输电系统接地极线路保护存在死区的问题,提出了一种基于谐波测量阻抗偏差的接地极线路保护新方法。在不同故障工况下推导了接地极线路的谐波测量阻抗表达式,利用阻抗表达式分析了正常运行工况与故障工况下谐波测量阻抗的偏差特性。在此基础上,提出了基于谐波测量阻抗偏差的接地极线路故障保护判据。利用PSCAD/EMTDC进行仿真验证,仿真结果表明,所提保护方法较传统保护方法可有效检测到接地极线路发生的各种故障,耐受过渡电阻能力强,且不存在保护死区。Aiming at the problem of protection dead zone in the grounding electrode line of ultra-high voltage direct current(UHVDC) transmission system,a new method of UHVDC grounding electrode line protection based on the harmonic measurement impedance deviation is proposed. The expression formulations of harmonic measurement impedance of the grounding electrode line under different fault conditions are derived,and the deviation characteristics of the harmonic measurement impedance under normal operating and fault conditions are analyzed. Then,a fault protection criterion based on the deviation of the harmonic measurement impedance is constructed. Simulative results of PSCAD/EMTDC model show that compared with the traditional protection methods,the proposed method can effectively identify different types of fault with strong ability to withstand transition resistances,and there is no dead zone.

关 键 词：特高压直流输电 接地极线路 谐波测量阻抗 阻抗偏差 线路保护 

分 类 号：TM77[电气工程—电力系统及自动化]