±1100kV换流站直流场金具表面电场仿真静态场等效方法  

A Static Field Equivalence Method for Simulation of Fitting Surface Electric Field in ±1100kV DC Yards of Converter Stations

作　　者：乐波[1] 陈东[1] 付颖[2] 郭贤珊[2] 黄道春[3] 谢一鸣 

机构地区：[1]国网北京经济技术研究院,北京市昌平区102209 [2]国家电网公司,北京市西城区100031 [3]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电网技术》2017年第11期3427-3434,共8页Power System Technology

基　　金：国家重点研发计划项目(2016YFB0900805)~~

摘　　要：我国的准东—皖南±1100 kV特高压直流输电工程是目前世界上电压等级最高的高压输电工程。随着电压等级的提高,换流站直流场设备中金具表面电场的控制裕度也越来越严格。为提高电场仿真计算结果的准确性,针对换流站金具电场仿真的瞬态场计算等效为静态场计算的方法进行研究,并结合电磁场理论,提出采用静态场等效瞬态场进行计算:在操作过电压、工频交流电压下可将瞬态电场等效成静电场分析;换流站典型直流电压波形下,可将瞬态电场等效成恒定电场分析,并用二维轴对称支柱绝缘子模型进行验证,最终应用于直流场全模型计算中。计算结果表明:在电准静态场下,针对不同电压激励,采用相应的静态场等效瞬态场计算,可以在保证精度的前提下,提高计算效率。对±1100 kV换流站直流场设备金具优化设计具有重要的指导意义。The Zhundong-Wannan ±1100 kV UHVDC transmission project in China is a ultra high voltage（UHV） transmission project with the highest voltage level over the world.With increase of voltage level,control margin of fittings surface electric field in converter stations becomes increasingly narrower than before.In order to improve accuracy of electric field simulation results,in this paper,a static field equivalence method was studied for surface electric field simulation of converter fittings,and combining with electromagnetic field theory,the method adopting static field calculation equivalent to transient field calculation under different voltages was presented：the transient electric field can be equivalent to static electric field under the loading switching of overvoltage and power frequency alternating current（AC） voltage;under the typical direct current（DC） voltage waveform of converter station,the transient electric field can be equivalent to the analysis of constant electric field.Two-dimensional（2D） axisymmetric post insulator was used as a model to verify the proposed method.Its influence on calculation accuracy of constant electric field was discussed.Finally,the method was applied to full model of DC yard calculation.Computation results showed that in case of quasi-static electric field,the proposed method could improve calculation efficiency while retaining considerable accuracy,simplify complex electromagnetic field calculation and provide reliable support for designing ±1 100 kV DC yards of converter stations.

关 键 词：±1100 kV直流输电 瞬态电场 静电场 恒定电场 换流站直流场 

分 类 号：N14[自然科学总论]