城轨交流供电系统极限供电距离分析  

Analysis on Extreme Distance of Power Supply for Urban Rail AC Power Supply System

作　　者：张丽艳[1] 杨亮辉 韩笃硕 ZHANG Liyan;YANG Lianghui;HAN Dushuo(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《西南交通大学学报》2021年第4期698-705,共8页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(51877182);四川省科技计划(2020YJ0011)。

摘　　要：供电距离是衡量一个牵引系统供电能力的重要指标,对系统的稳定、经济运行具有现实影响.城轨交流供电系统采用电缆结构的牵引网,具有稳定、大容量输电的突出特点,因此量化研究该系统供电距离具有重要意义,本文从理论推导的角度对系统极限供电距离进行分析,根据系统的电路拓扑特点,理论推导系统牵引网阻抗、单车多车时牵引网电压损失、钢轨电位.首先从牵引网采用架空线与电缆时的自然功率对比,推算采用不同截面积电缆时系统的极限供电距离;其次以系统高峰工况时的电压损失作为限制条件,分析系统极限供电距离;最后以既有电气化铁路标准对钢轨电位规定的限值作为限制条件,分析系统最大短回路区间长度.系统仿真结果表明:城轨交流供电系统最大单区间供电长度可达9.31 km,主变电所位于线路中间位置时,系统极限供电距离可达84.22 km.The power supply distance is an important indicator to measure the power supply capacity of a traction system,and has a practical impact on the stability and economic operation of the system.The urban rail AC power supply system uses the cable structure of the traction network,which has the outstanding characteristics of stable and large-capacity transmission.Therefore,it is of great significance to quantitatively study the power supply distance of the system.In this work,the extreme distance of power supply is analyzed theoretically.According to the circuit topology characteristics of the system,the traction network impedance as well as traction network voltage loss and rail potential are deduced for a single vehicle and multiple vehicles.First,by the natural power comparison between the overhead line and the cable in the traction network,the extreme distance of power supply is calculated in the cases of different cable cross-sectional areas.Secondly,the extreme distance of power supply is analyzed with the constraint of the voltage loss at the peak operating of the system.Finally the rail potential values prescribed in existing electrified railway standards are used as constraints to analyze the maximum short loop length of the system.In simulation,the maximum single-section power supply length of the urban rail AC power supply system can reach 9.31 km.When the main substation is located in the middle of the line,the extreme power-supply distance can reach 84.22 km.

关 键 词：城轨交流 牵引电缆 供电距离 自然功率 钢轨电位 

分 类 号：U223.6[交通运输工程—道路与铁道工程]