电工技术学报  2021, Vol. 36 Issue (23): 4864-4873    DOI: 10.19595/j.cnki.1000-6753.tces.210025
轨道交通安全供电技术专题 |
直流动态杂散电流在分层介质中的扩散模型
刘炜1, 尹乙臣1, 潘卫国2, 杨龙1, 张浩1
1.西南交通大学电气工程学院 成都 610031;
2.北京全路通信信号研究设计院集团有限公司 北京 100071
Diffusion Model of DC Dynamic Stray Current in Layered Soil
Liu Wei1, Yin Yichen1, Pan Weiguo2, Yang Long1, Zhang Hao1
1. School of Electric Engineering Southwest Jiaotong University Chengdu 610031 China;
2. Beijing National Railway Communication Signal Research and Design Institute Group Co. Ltd Beijing 100071 China
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摘要 为了研究直流牵引供电系统杂散电流的干扰范围和影响程度,将回流系统分布式电路等效为集中电路,建立牵引供电系统集中等效电路,采用节点电压法进行系统潮流计算,基于潮流计算结果,建立全线杂散电流随时间动态分布模型;采用叠加原理建立动态杂散电流在层状介质中的扩散模型,利用Prony法进行求解,与CDEGS软件仿真结果进行对比,地电位计算误差在8.66%以内。国内某地铁线路列车采用6B编组,最大速度80km/h,发车间隔2min,混凝土电阻率为0.503Ω·km,土壤电阻率为38.9Ω·m,埋地金属结构与地铁线路距离50m时,钢轨过渡电阻值提高至40Ω·km以上,或钢轨过渡电阻值为5.31Ω·km时,埋地金属结构与地铁线路的距离增大至0.25km以上,沿线大地电位梯度小于2.5mV/m;缩短供电距离,能降低杂散电流干扰。
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关键词 直流牵引供电系统杂散电流分层介质扩散模型影响因素    
Abstract:In order to study the interference range and influence degree of the stray current of the DC traction power supply system, the distributed circuit of the return system was equivalent to a centralized circuit. The node voltage method is used to calculate the system power flow. Accordingly, a dynamic distribution model of the stray current over time was established, and the diffusion model of dynamic stray current in layered media was established by the superposition principle. The Prony method was used to solve the model. Compared with the simulation results of CDEGS software, the ground potential calculation error was within 8.66%. A domestic subway line adopts 6B grouping, the maximum speed is 80km/h, the departure interval is 2min, the concrete resistivity is 0.503Ω·km, and the soil resistivity is 38.9Ω·m. When the distance between the buried metal structure and the subway line is 50m, the rail transition resistance value is increased to more than 40Ω·km, or when the rail transition resistance value is 5.31Ω·km, the distance between the buried metal structure and the subway line is increased to more than 0.25km, and the ground potential gradient along the line is less than 2.5mV/m, which means shortening the power supply distance can reduce stray current interference.
Key wordsDC traction power supply system    stray current    layered medium    diffusion model    influencing factors   
收稿日期: 2021-01-07     
PACS: TM922  
基金资助:国家重点研发计划(2017YFB1201103-05)和基于车-地-轨耦合的杂散电流评估与控制技术(2017YFB1201103-05)资助项目
通讯作者: 潘卫国 男,1980年生,高级工程师,研究方向为牵引供电系统设计及智能铁路供电系统。E-mail: panweiguo@crscd.com.cn   
作者简介: 刘 炜 男,1982年生,副教授,博士生导师,研究方向为杂散电流、牵引供电系统设计仿真和再生制动能量利用。E-mail: liuwei_8208@swjtu.cn
引用本文:   
刘炜, 尹乙臣, 潘卫国, 杨龙, 张浩. 直流动态杂散电流在分层介质中的扩散模型[J]. 电工技术学报, 2021, 36(23): 4864-4873. Liu Wei, Yin Yichen, Pan Weiguo, Yang Long, Zhang Hao. Diffusion Model of DC Dynamic Stray Current in Layered Soil. Transactions of China Electrotechnical Society, 2021, 36(23): 4864-4873.
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