交直流同塔多回输电线路导线布置方式与走廊宽度研究  

Analysis of Configuration and Corridor Width of HVAC and HVDC Transmission Lines on Same Tower

作　　者：李本良[1] 乔骥[2] 邹军[2] 袁建生[2] 

机构地区：[1]国网北京经济技术研究院,北京市昌平区102209 [2]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《电网技术》2017年第1期342-348,共7页Power System Technology

基　　金：国家电网公司科技项目(SGTJ0000KXJS1 400081)~~

摘　　要：交直流同塔线路混合电场是决定导线对地高度和走廊宽度从而进行线路优化设计的重要因素。由于其地面横向分布是交流分量和直流分量共同作用的结果,因此其分布特性与两者的叠加和分布特点有着密切的联系。以两回330 k V、750 k V交流线路分别与单回?1100 k V直流线路同塔架设为例,分析了交流线路在不同布置方式与相序排列方式下地面混合电场的分布特性与规律,并据此计算了导线对地最小高度和走廊宽度。结果表明,根据混合电场交、直分量的横向衰减特性,从走廊中心向外,地面混合电场可分为交流分量占主导的"交流区",交、直流分量比例相当的"混合过渡区"以及直流分量占主导的"直流区",为保证地面交、直流分量"错峰"布置,两回交流线路应采用垂直或倒三角排布方式,此时导线最小对地高度按照交流线路单独运行时的情况设计即可。当交流为750 kV线路时,走廊宽度主要由交流电场控制;交流为330 kV线路时,走廊宽度则由交直流电场分量共同控制。最终推荐采用垂直排布的相序6和倒三角排布的相序4两种布置方式。Hybrid electric field of ac/dc transmission lines on the same tower is a most important factor for line configuration design. Lateral profile of electric field on ground has close relationship with superposition and distribution of ac and dc component. In this paper, hybrid electric field and ion current are calculated and analyzed for double-circuit 330 k V or 750 k V ac lines and ？1100 k V dc lines on the same tower with different configuration and phase sequences. Minimum conductor heights and corridor widths are also computed. Results show that electric field profile on ground level can be categorized into three regions： ac, hybrid and dc. ‘Inverted triangle＇ and ‘vertical＇ structures are proposed to be used to separate positions of peak values of dc and ac components. Corridor widths are determined by ac field for 750 k V lines while by both ac and dc fields for 330 k V ac lines. Finally, configurations I（phase sequences 6） and II（phase sequences 4） are proposed for hybrid ac/dc lines on the same tower.

关 键 词：交直流同塔线路 地面混合电场 离子流场 导线对地高度 走廊宽度 

分 类 号：TM75[电气工程—电力系统及自动化]