电晕空间电荷对特高压直流输电线路地线雷电屏蔽性能的影响  

Influence of Corona Space Charge on Lightning Shielding Performance of Ground Wire of UHVDC Transmission Line

作　　者：何慧雯 陈杉杉[2] 贺恒鑫[2] 邹妍晖 余军 陈维江 肖冕 HE Huiwen1, CHEN Shanshan2, HE Hengxin2, ZOU Yanhui2, YU Jun3, CHEN Weijiang3, XIAO Mian2(1. China Electric Power Research Institute, Wuhan 430074, Hubei Province, China; 2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology （Huazhong University of Science and Technology）, Wuhan 430074, Hubei Province, China; 3. State Grid Corporation of China, Xicheng District, Beijing 100031, China)

机构地区：[1]中国电力科学研究院有限公司,湖北省武汉市430074 [2]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074 [3]国家电网有限公司,北京市西城区100031

出　　处：《电网技术》2018年第4期1039-1047,共9页Power System Technology

基　　金：国家重点研究发展计划项目(2016YFB0900801);国家自然科学基金资助项目(51607076);国家电网公司科技项目(GYW17201600056)~~

摘　　要：受雷云电场和直流工作电压的叠加作用,导地线因电晕放电产生大量正、负离子积聚在线路附近形成空间电荷层。为研究电晕空间电荷对特高压直流线路雷电绕击性能的影响,建立了雷云电场作用下线路电晕空间电荷分布的数值计算模型,并耦合雷电先导发展模型,计算获得了典型±1100 kV特高压直流输电线路的地线雷电上行先导放电特性和雷电击距,定量分析了电晕空间电荷对特高压直流输电线路地线雷电上行先导起始时刻、放电电流和长度的影响。通过计算电晕空间电荷作用下地线的雷电击距和暴露弧,得出在平原地区仍可通过采用负保护角配置,有效降低线路的雷电绕击概率,未来需进一步研究山区地形下电晕空间电荷对特高压直流线路雷电绕击性能的影响规律。Subjected to simultaneous effect of thunder cloud and DC operation voltage, corona discharge will produce a space charge layer formed with a huge number of positive and negative ions in vicinity of UHVDC line. To study influence of corona space charge on lightning shielding performance of UHVDC transmission line, a numerical model was established to simulate corona space charge development from the UHVDC overhead transmission line subjected to thunder cloud field. Combined with self-consistent leader inception and propagation model（SLIM）, upward leader characteristics and strike distance of a typical ±1100 kV UHVDC ground wire were simulated in presence of corona space charge. Based on these, influences of corona space charge on initial time of upward leader, discharge current and length were quantitatively analyzed. By calculating the strike distance and expose arc of ground wire under corona space charge, it is concluded that negative protection angle configuration in plain area can be used to efficiently reduce shielding failure rate even taking effect of corona discharges into account. Influence of corona space charge on lightning shielding performance of UHVDC transmission lines in mountainous terrain should be further studied in future.

关 键 词：特高压直流 雷电先导发展模型 电晕空间电荷 雷电上行先导 

分 类 号：TM721[电气工程—电力系统及自动化]