摘要
直流牵引供电系统杂散电流产生的直流干扰问题日趋严重。为研究杂散电流的干扰程度,将直流牵引供电回流系统与杂散电流扩散模型进行联合仿真。考虑段场与正线之间的互相影响,建立段场集中点电流源泄漏与正线沿线钢轨分布式泄漏共同作用下的动态杂散电流在分层介质中的扩散模型。提出分层模型的精细积分主元加权迭代方法,从而避免一般方法求解失败的问题,实现高精度、高效率求解分层格林函数。以中国实际地铁工程为例,采用该文模型对段场的杂散电流和附近土壤地表电位梯度的现场测试进行过程还原,实测与仿真结果误差在8.46%以内。直流牵引供电系统正线与段场之间采用阻断式连接方案,可使得附近土壤的地表电位梯度降低46.53%。
Currently,there are many factors affecting the rail potential and stray current,but the influence of the superposition of the depot and the mainline on the distribution and diffusion of stray current is not considered.Considering the complex operation conditions of multiple trains in the depot and main line,the distribution characteristics of stray current and its diffusion in the ground were studied.The return system and the stray current diffusion model were jointly simulated.The layered model based on the precise integration principal component weighted iteration method can dynamically evaluate the dynamic stray current in a certain period,reduce the calculation cost,and obtain high-precision and efficient calculation results.The return system was equivalently replaced by distributed parameters and concentrated parameters,and the node voltage method is used for power supply calculation.The distribution of the rail potential and stray current leakage across the line is obtained.Considering the layered soil medium,the model of the stray current potential distribution in the ground along the mainline superimposed by the power supply at the section points was established.Based on the ground potential distribution model of the point current source in layered medium,the dynamic change model of the ground potential gradient with time was obtained.It is important to transform the ill-conditioned problem into a benign problem that is easy to solve for the problem of solving the ill-conditioned matrix of Green's function.The weight of the principal component weighting was determined by the weighting factor q and the weighting matrix P.Different weights were superimposed on each principal component to better reduce the number of conditions.A precise integration principal component weighted iteration method for the layered model was proposed,which can solve Green's function of the layered model with high accuracy and efficiency.The validity of the layered model of stray current potential distribution in the ground was ver
作者
刘炜
周林杰
唐宇宁
潘哲
尹乙臣
Liu Wei;Zhou Linjie;Tang Yuning;Pan Zhe;Yin Yichen(School of Electric Engineering Southwest Jiaotong University,Chengdu 610031 China;State Grid Suining Power Supply Company,Suining 629000 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第16期4421-4432,共12页
Transactions of China Electrotechnical Society
基金
四川省自然科学基金资助项目(2022NSFSC0463)。
关键词
直流牵引供电系统
钢轨电位
杂散电流
扩散模型
联合仿真
DC traction power supply system
rail potential
stray current
diffusion model
co-simulation
