“交改直”±200 kV同塔三回直流线路过电压研究  

Study on overvoltage in±200 kV triple-circuit DC transmission lines on the same tower for an AC-to-DC transmission project

作　　者：陈松涛 陈兵 吴巍 柏彬 赵会龙 廖黎明 杨庆[4] CHEN Songtao;CHEN Bing;WU Wei;BAI Bin;ZHAO Huilong;LIAO Liming;YANG Qing(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,China;Construction Branch of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,China;East China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Shanghai 200000,China;School of Electrical Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]国网江苏省电力有限公司,南京210000 [2]国网江苏省电力有限公司建设分公司,南京210000 [3]中国电力工程顾问集团华东电力设计院有限公司,上海200000 [4]重庆大学电气工程学院,重庆400044

出　　处：《浙江电力》2025年第3期108-115,共8页Zhejiang Electric Power

基　　金：国家自然科学基金(52077019)。

摘　　要：在同塔双回交流输电的设施基础上将其改造为同塔三回直流输电,无需大规模新增投资、消耗输电走廊资源便能显著提高输电容量。针对同塔三回直流线路的绝缘配合设计,依托国内首个交流改直流±200 kV扬州—镇江直流输电工程,对6种直流极线布置方案下过电压沿直流线路的分布特性和最大电压进行比较分析,并与单回架设直流线路的过电压进行对比。此外,分析了影响同塔架设三回直流线路过电压水平的因素。研究表明,同塔三回直流线路不同布置方式下线路过电压的沿线分布特性相近,且同塔三回架设线路过电压水平略低于单回架设线路;直流系统输送功率大小、直流滤波器主电容与土壤电阻率是影响过电压水平的主要因素。研究结果已为扬州—镇江直流工程的设计建造提供了技术依据。Converting double-circuit AC transmission lines on the same tower to triple-circuit DC transmission lines can significantly enhance transmission capacity without requiring large-scale additional investments or consuming transmission corridor resources.Focusing on the insulation coordination design of triple-circuit DC lines on the same tower,this paper examines the±200 kV Yangzhou-Zhenjiang AC-to-DC transmission project,the first of its kind in China.Six DC pole line layout schemes are analyzed to compare the distribution characteristics and maximum over⁃voltage along the DC lines,with results further compared to single-circuit DC line configurations.Additionally,the factors influencing overvoltage levels in triple-circuit DC lines on the same tower are explored.The findings indicate that the overvoltage distribution characteristics along the line are similar across different layout schemes for triplecircuit lines,and the overvoltage levels for triple-circuit lines on the same tower are slightly lower than those of single-circuit lines.Key influencing factors include the DC system’s transmission power,the main capacitance of DC filters,and soil resistivity.These results have provided a technical foundation for the design and construction of the Yangzhou-Zhenjiang AC-to-DC transmission project.

关 键 词：交流改直流输电 高压直流输电 同塔三回线路 线路过电压 

分 类 号：TM7[电气工程—电力系统及自动化]