摘要
为研究轨地过渡电阻对电网中地铁杂散电流分布的影响,提出了在多层分区土壤下地铁与电网的杂散电流耦合模型以及交流电网模型。首先,基于实测土壤数据建立多层分区土壤模型,通过CDEGS软件建立贵阳市某地铁线路和片区电网耦合模型。然后,在考虑地铁列车运行工况的同时,仿真分析了轨地过渡电阻变化对地铁杂散电流和变压器中性点直流电流分布的影响。最后,结合实际电网参数,根据所提耦合模型变压器中性点流入电流的仿真结果设置外部直流电源输入,进而借助PSCAD/EMTDC软件构建贵阳市某片区电网杂散电流分布模型。仿真结果表明,轨地过渡电阻减小会增大变压器中性点、输电线路以及变压器励磁绕组中的杂散电流。
To research the influence of the rail-to-ground resistance on the subway stray current distribution in the AC power grid,this paper proposes a coupled simulation model for the stray current of subway and AC power system under the multi-layer zoned soil,and a simulation model for AC power grid.First,it builds a multi-layer zoned soil model based on the measured soil data,and establishes a coupled model of a subway line and a district power grid in Guiyang using CDEGS software.Second,the influence of the rail-to-ground resistance on the distribution of subway stray current and the direct current at neutral point of the grounding transformer is analyzed with the trains operating conditions of the subway considered at the same time.Finally,according to the actual electrical parameters,the external DC power input is set by the simulation results for the neutral point DC of grounding transformer in the coupled model.The simulation model of stray current distribution in the power grid in a certain area of Guiyang is further obtained with the help of PSCAD/EMTDC software.The results show that the reduction of the rail-to-ground resistance will cause the increase of the neutral point DC of grounding transformer,the stray current in the transmission line and the excitation winding of transformer.
作者
罗远国
刘君
毛钧毅
荣娜
王乃进
LUO Yuanguo;LIU Jun;MAO Junyi;RONG Na;WANG Naijin(Department of Electrical Engineering,Guizhou University,Guiyang 550025,Guizhou,China;Electric Power Research Institute,Guizhou Power Grid Co.,Ltd.,Guiyang 550002,Guizhou,China;Anshun Power Supply Bureau,Guizhou Power Grid Co.,Ltd.,Anshun 562400,Guizhou,China)
出处
《电网与清洁能源》
北大核心
2021年第4期32-40,46,共10页
Power System and Clean Energy
基金
贵州省科学技术基金(黔科合基础[2019]1100)
南方电网公司科技项目(GZKJXM20182480)。
