城市轨道交通杂散电流与电网直流偏磁电流耦合关系与检测的研究展望

Research and Prospect of Detection and Coupling Relationship between Stray Current in Urban Rail Transit and Grid DC Bias Magnetic Current

随着城市轨道交通的快速发展,轨道交通牵引供电系统与电网的关联性越来越强。为促进城市轨道交通与电网的和谐发展,需要对城市轨道交通杂散电流与电网直流偏磁电流的相互影响及耦合关系进行深入研究。详细分析了轨道交通杂散电流的产生、主要因素及其影响,对比了轨道交通杂散电流与电网直流工程直流单极运行、电磁暴所导致直流偏磁的差异。对目前轨道交通杂散电流和电网直流偏磁仿真、检测及监测的现状进行了分析,对杂散电流和直流偏磁领域,包括多列车、非均匀电阻率、复杂地形下的杂散电流仿真,计及杂散电流的电网直流偏磁仿真、杂散电流和直流偏磁电流监测、杂散电流与直流偏磁电流的关联关系的分析研究作了总结。同时,对现有涉及杂散电流与直流偏磁国际与国内的标准进行了对比分析,并提出开展国际标准研究的建议。研究分析提出了轨道交通系统与电网的联合仿真、轨道交通杂散电流与直流偏磁电流的多点同步监测等研究未来发展方向。

With the rapid development of urban rail transit,the relationship between power grid and traction power supply system of rail transit is becoming stronger and stronger.In order to promote the harmonious development of urban rail transit and power grid,it is necessary to carry out deep research on the coupling relationship between stray current of urban rail transit and DC bias magnetic current of power grid.This paper makes a detailed analysis on the generation,main factors and influence of stray current in rail transit,and a comparison on the differences betweenthe stray current of rail transit and the DC magnetic bias caused by the single-pole operation of DC project and theelectromagnetic storm.Then,the paper analyzes the present situation of the simulation,detection and monitoring ofthe stray current of rail transit and DC magnetic bias of power grid,simulates the field of stray current and DCmagnetic bias,including the stray current in such cases as multi-train,non-uniform resistivity and complexterrain,and summarizes the analysis and research on the simulation of stray current DC magnetic bias in powergrid,the monitoring of stray current and DC bias magnetic current,and the correlation between stray current andDC bias magnetic current.In addition,the paper compares and analyzes the existing international and domesticstandards related to stray current and DC magnetic bias,and raises suggestions for the research on internationalstandards.Finally,through study and analysis,the paper puts forward the future directions of researches on suchitems as co-simulation of rail transit system and power grid,multi-point synchronous monitoring of rail transit straycurrent and DC bias magnetic current,etc.