摘要
以AT牵引网模型为研究基础,提出了考虑桥墩高度的雷击接触网过电压仿真的方法,计算出考虑桥墩高度时14根牵引网导线之间的电气关系,为了简化计算和方便建模,对得出的线路参数矩阵降为6阶.综合比较三种雷电流函数的优缺点,选取了Heidler函数雷电流作为仿真时的雷电流信号.基于MAT-LAB/Simulink仿真软件搭建仿真平台,分别对有桥墩高度和无桥墩高度的AT牵引网做雷击过电压研究.结果表明:当雷击上行接触线时,有桥墩高度的接触线过电压峰值比无桥墩高度的小,而有桥墩高度的馈线过电压峰值要比无桥墩的大;雷击馈线和保护线时,除了雷击保护线时有桥墩高度的馈线过电压峰值要比无桥墩的大,其余有桥墩高度的过电压峰值都比无桥墩的较小.由此可得牵引网导线过电压幅值不仅与雷电流大小有关,还与导线电气参数有关,但雷击牵引网后在导线上都产生了幅值较大的过电压,所以无论是雷击接触线还是正馈线,对架设在桥墩上的那部分高铁线路应给予充分的雷击保护.
Based on the AT traction network model,a lightning catenary overvoltage simulation method consid-ering the height of the bridge pier is proposed,and the electrical relationship between the 14 traction network conductors is calculated with the consideration of the bridge pier height.In order to simplify the calculation and facilitate the construction,the line parameter matrix obtained is reduced to 6th order.The advantages and disadvantages of the three lightning current functions are comprehensively compared,and the Heidler function lightning current is selected as the lightning current signal during simulation.The simulation platform is built based on MATLAB/Simulink simulation software respectively.The lightning overvoltage research of AT trac-tion network with pier height and without pier height shows that when lightning strikes the upstream contact line,the peak overvoltage of the contact line with pier height is smaller than that without pier height.While the feeder with pier height,the peak overvoltage is larger than that without piers.When lightning strikes the feeder and the protection line,the overvoltage peaks of the feeder with the pier height are larger than those without piers,and the overvoltage peaks with the pier height are all higher than those without piers.It can be obtained that the overvoltage amplitude of the traction network conductor is not only related to the magnitude of the lightning current,but also related to the electrical parameters of the conductor.However,after the light-ning strikes the traction network,an overvoltage is generated on the conductor.Therefore,whether the contact line or the positive feeder is struck by lightning,the part of the high-speed railway line erected on the pier should be given sufficient lightning protection.
作者
邱玉成
李东辉
马晓中
QIU Yucheng;LI Donghui;MA Xiaozhong(School of Electrical Information Engineering,Dalian Jiaotong University,Dalian 116028,China;Power Supply Section of China Railway Beijing Bureau Group Co.,Ltd,Beijing 100036,China)
出处
《大连交通大学学报》
CAS
2021年第5期115-120,共6页
Journal of Dalian Jiaotong University
