地铁杂散电流引起动态地电位分布建模及影响因素分析  

Modeling and Influencing Factors Analysis of Dynamic Potential Distribution Caused by Metro Stray Current

作　　者：倪砚茹 曾祥君[1] 喻锟[1] 程新翔 唐雨杭 卓超[1] NI Yanru;ZENG Xiangjun;YU Kun;CHENG Xinxiang;TANG Yuhang;ZHUO Chao(Hunan Province Key Laboratory of Smart Grids Operation and Control(Changsha University of Science and Technology),Changsha 410114,Hunan Province,China)

机构地区：[1]智能电网运行与控制湖南省重点实验室(长沙理工大学),湖南省长沙市410114

出　　处：《中国电机工程学报》2023年第23期9059-9071,共13页Proceedings of the CSEE

基　　金：湖南省自然科学基金(面上项目)(2022JJ30043);湖南省研究生科研创新项目(CX20210787);国家电网公司科技项目(5100-202199276A-0-0-00)。

摘　　要：针对地铁运行导致变压器直流偏磁、埋地管道腐蚀而带来的地铁杂散电流干扰和影响评估问题,提出杂散电流引起动态地电位分布建模方法。通过将多区间、多列车地铁线路等效为多时变电源电阻网络模型,实现杂散电流实时分布计算;进一步将其等效为非均匀散流线电流源,结合线路地理信息,基于点电流源电场的空间数值积分实现地铁全周转时间内的地电位动态计算;利用CDEGS软件仿真和现场实测数据,验证模型计算结果的准确性。以国内某市1、2号线地铁线路为例,计算杂散电流引起大地电位波动区间,以电位梯度变化评估杂散电流干扰范围及程度,并分析机车运行工况、轨地过渡电阻和土壤电阻率因素对地电位梯度的影响规律。The subway operation causes the transformer DC bias and buried pipeline corrosion,which requires the interference and impact assessment of metro stray current.A modeling method of dynamic earth potential distribution caused by metro stray current is proposed.By using the multiple power supply sections as an equivalent resistance network model with multi-power accumulation,the real-time distribution calculation of stray current is realized.Based on the numerical integration of the point current source electric field and geographical information,the dynamic calculation of the potential during the train turnover time is realized.Using CDEGS software simulation and field measurement data,the accuracy of the proposed model is verified.Taking two metro lines as an example,the potential fluctuation interval is calculated,and the stray current disturbances range is evaluated with potential gradient.The influence of train operating conditions,rail-ground transition resistance and soil resistivity factors on potential gradient is analyzed.

关 键 词：地铁牵引供电系统 杂散电流 地表电位 电位梯度 影响因素 

分 类 号：TU22[建筑科学—建筑设计及理论]