特高压直流换流站短路电流超标机理及抑制措施研究  

Research on the Mechanism of Excessive Short Circuit Current at the UHV DC Converter Station and Its Restraining Measures

作　　者：王新宝[1] 刘永刚[1] 盛能进 俞秋阳[1] 常宝立[1] WANG Xinbao;LIU Yonggang;SHENG Nengjin;YU Qiuyang;CHANG Baoli(NR Electric Co.,Ltd.,Nanjing Jiangsu 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《湖北电力》2024年第2期77-84,共8页Hubei Electric Power

基　　金：国家重点研发项目(项目编号:2023YFB2405900)。

摘　　要：随着电网规模的不断扩大,短路电流不断上升,成为制约电网发展的关键问题。针对特高压直流送端换流站单相与三相短路电流均超标,并且单相短路电流甚至大于三相短路电流的问题,分析了其产生的原因及机理,并从短路电流抑制效果、经济性以及电网运行可靠性等多个维度比较了不同短路电流限制措施,研究表明:串联电抗器与变压器中性点小电抗的组合方案最适合解决此类短路电流超标问题。兼顾方案经济性以及降低对电网运行的影响,提出了串联电抗器与变压器中性点小电抗组合方案的参数实用设计方法,简易方便,可为解决特高压直流换流站短路电流超标问题提供参考。With the continuous expansion of power grid scale,short-circuit current keeps rising,which becomes the key problem restricting the development of power grid.Aiming at the problem that the single-phase and three-phase short-circuit current of UHV DC converter station exceeds the standard,and the single-phase short-circuit current is even greater than the three-phase short-circuit current,this paper analyzes the causes and mechanisms of short-circuit current,and makes a comparison on the different short-circuit current restricting measures from the aspects of short-circuit current suppression effect,economy and power grid operation reliability.The research results show that the combination of series reactor and transformer with small neutral reactance is the most suitable solution for this kind of short-circuit current exceeding the standard.Taking into account the economy of the scheme and reducing the influence on the operation of the power grid,the paper also proposes a practical parameter design method of the combination scheme of series reactor and transformer with small neutral reactance.The proposed method is simple and convenient,and also provides reference for solving the problem of excessive short-circuit current in UHV DC converter station.

关 键 词：特高压直流 短路电流 换流站 串联电抗器 中性点小电抗 

分 类 号：TM73[电气工程—电力系统及自动化]