直流接地极入地电流引起的高速铁路系统不同位置变压器直流电流分布规律  

DC Current Distribution Law of Transformers at Different Positions in High-speed Railway System Caused by Ground Return Current From HVDC Grounding Electrode

作　　者：张华志[1] 宋伟 黄军[1] 陈争 李晨琨 张波[2] ZHANG Huazhi;SONG Wei;HUANG Jun;CHEN Zheng;LI Chenkun;ZHANG Bo(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430000,Hubei Province,China;State Key Lab of Control and Simulation of Power Systems and Generation Equipments(Dept,of Electrical Engineering,Tsinghua University),Haidian District,Beijing 100084,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北省武汉市430000 [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》2021年第7期2871-2878,共8页Power System Technology

基　　金：中铁第四勘察设计院集团有限公司科研项目(2018K058)。

摘　　要：随着我国直流输电工程与高速铁路的广泛延伸,直流接地极与高速铁路相接近的情况时有发生。当直流接地极有大电流入地时,直流电流会流入高速铁路系统,可能造成沿线变压器直流偏磁。该文建立了包含高速铁路综合接地系统和牵引供电系统的直流电流分布的分析模型,计算了直流接地极入地电流在高速铁路系统的总体分布,获得牵引变电所、自耦变压器(auto transformer,AT)所、分区所内各变压器和机车牵引变压器流过的直流电流,分析以上各所的间距、直流接地极位置、动车的存在等因素对流过变压器的直流电流的影响。研究结果表明,接地极在高铁上的投影位于牵引变电所或AT所时所内变压器流过的直流电流最大,而位于分区所或相邻两所中间位置时,流过变压器的直流电流会有所降低。动车位置对高速铁路直流电流分布影响不大。With the rapid extension of HVDC transmission projects and high-speed railways in China,the situation that a DC ground electrode is placed closely to the high-speed railway has occurred from time to time.When a large current injected into the earth from the DC ground electrode,some of the DC current will flow into the high-speed railway system,which may cause DC bias of the transformers in the high-speed railway.In this paper,the analysis model of the DC current distribution with the high-speed railway integrated grounding system and the traction power supply system is established.The overall distribution of the DC current in the high-speed railway system is calculated.The currents flowing through the transformers in the traction substation,AT substation,section post and locomotive traction transformer are obtained.The influence of the spacing between the above stations,the positions of the DC ground electrodes,and the existence of the locomotive on the DC current flowing through the transformers is analyzed.The research results show that when the projection of DC grounding electrode is located in the traction substation or the AT substation,the DC current flowing through the transformer in the substation is the largest.When it is located in the section post or in the middle of two adjacent substations,the DC current flowing through the transformer will be reduced.The position of the locomotive has little effect on the DC current distribution along the high-speed railways.

关 键 词：直流输电 接地极 高速铁路 电路模型 变压器 直流偏磁 

分 类 号：TM721[电气工程—电力系统及自动化]