交直流共走廊输电系统换流变偏磁特性研究  

Research on DC Magnetic Biasing Characteristic of Converter Transformer for AC/DC Corridor-Sharing Power Transmission System

作　　者：张龙伟[1] 吴广宁[1] 范建斌[2] 黄渤[1] 朱军[1] 

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2013年第12期3375-3380,共6页Power System Technology

基　　金：国家电网公司科技项目(2011-WG-4)~~

摘　　要：交直流共走廊输电系统换流变偏磁直流量构成比较复杂,正确分析其构成分量对系统稳定运行具有重要意义。建立了换流变直流偏磁模型和交直流共走廊输电线路模型,分别计算了土壤地电位和交直流工频感应产生的直流量;研究了交直流线路平行架设长度、交直流杆塔中心接近距离对换流变偏磁的影响规律。研究结果表明:交直流线路平行架设长度越长,换流变偏磁直流量越大,工频感应产生直流量占总直流量的比重越大,且土壤地电位对此比重影响越小;交直流杆塔中心接近距离越大,换流变偏磁直流量越小,工频感应产生直流量占总直流量的比重越小,且土壤地电位对此比重影响越大。In view of complex composition of DC magnetic biasing in converter transformer for AC/DC corridor-sharing power transmission system, it is of significance for stable operation of the transmission system to correctly analyze its constituents. A DC magnetic biasing model for converter transformer and a transmission line model of AC/DC corridor-sharing power transmission system are built, and the DC quantifies due to ground potential of the soil and power frequency induction of AC/DC transmission line are calculated respectively; the influencing rule of parallelly erected lengths of AC/DC transmission lines and the approach distance between the centers of AC and DC transmission towers on DC magnetic biasing researched. Research results show in converter transformer is that the longer the parallelly erected lengths of AC/DC transmission lines, the larger the DC magnetic biasing in converter transformer is, and the higher proportion of DC magnetic biasing due to power frequency induction in the total DC biasing, the lighter impact of ground potential of the soil on this proportion will be; the farther the approach distance between the centers of AC and DC transmission towers, the lower the DC magnetic biasing in converter transformer will be, and the smaller the proportion of DC magnetic biasing Component due to power frequency induction in total DC magnetic biasing, the stronger impact of ground potential of the soil on this proportion will be.

关 键 词：交直流共走廊 换流变 直流偏磁 直流量 线路 平行架设长度 杆塔接近距离 

分 类 号：TM712[电气工程—电力系统及自动化]