地电场方向和交流系统结构对±800kV蒙西换流站地磁感应电流的影响  

Impact of Geoelectric Field Direction and AC System Structure on Geomagnetically Induced Currents in ±800 kV Mengxi Convertor Station

作　　者：刘连光 杨培宏 郭世晓 刘春明 马成廉 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国网浙江省电力公司杭州供电公司,浙江省杭州市310009

出　　处：《电网技术》2016年第5期1295-1300,共6页Power System Technology

基　　金：国家自然科学基金项目(51577060);国家863高技术基金项目(2012AA121005)~~

摘　　要：地磁扰动(geomagnetic disturbances,GMD)下的特高压直流输电(ultra high voltage DC,UHVDC)系统,送受端交流电网的地磁感应电流(geomagnetically induced current,GIC)会侵入UHVDC换流变压器,导致其直流偏磁及产生谐波和温升等次生干扰。为研究地电场方向和接入系统结构对换流变GIC的影响,针对规划的蒙西换流站的2个接入系统方案,提出建模计算以15?为间隔的24个不同方向感应地电场作用下换流变GIC,并评估了2004年11月9日强磁暴作用下的GIC。结果表明,强磁暴产生的GIC会引起换流变严重的直流偏磁,同一地电场作用下2种接入系统方案中换流变GIC值差别较大,地电场方向对换流变的GIC也有较大影响。For ultra-high voltage direct current（UHVDC） power transmission system during geomagnetic disturbances（GMD）,geomagnetically induced currents（GICs） generated in sending and receiving AC systems will flow into convertor transformers in UHVDC system and cause DC-bias of convertor transformers,leading to a number of undesirable effects,such as harmonic generation and transformer heating.In order to analyze impact of geoelectric field direction and connected AC system structure on GICs in convertor transformers,this paper took planned Mengxi convertor station and its two programs of AC system connection as example,established a model to calculate GIC in convertor transformers under 24 electric fields with different directions with 15° interval,and assessed GIC under strong storms in 9-10 November 2004.Analysis shows that GICs driven by strong storms cause serious DC-bias of convertor transformers,and GIC amplitudes of these two programs are quite different for the same electric field,and electric field direction has obvious impact on GIC in convertor transformers.

关 键 词：地磁感应电流 换流变压器 地电场方向 系统结构 

分 类 号：TM721[电气工程—电力系统及自动化]