青藏铁路格拉段长距离供电方案研究及仿真分析

Research and Simulation Analysis of Long-distance Power Supply Scheme for Golmud-Lhasa Section of Qinghai-Tibet Railway

针对青藏铁路格(尔木)拉(萨)段沿线外部电源供电能力薄弱问题,探讨格拉段长距离供电技术,提出在直接供电方式下将架空接触网与双芯电缆混合构造牵引供电回路;利用MATLAB/Simulink搭建了架空接触网与双芯电缆混合仿真模型,以接触网最低网压为约束条件,仿真分析与不同行车密度相匹配的供电臂长度。为满足青藏铁路格拉段牵引供电能力需求,设计了采用长距离供电技术的系统设计方案,校验了紧密运行工况下各项牵引供电指标,与常规供电方案对比,验证了新方案具有良好的技术经济性。

In view of the weak power supply capacity of the external power supply along the Golmud-Lhasa section of the Qinghai-Tibet railway,this paper carried out a study on the long-distance power supply technology in the Golmud-Lhasa section and put forward a hybrid traction power supply circuit constructed by combining overhead catenary and double-core cables in the direct power supply mode.A hybrid simulation model of overhead catenary and double-core cables was built using MATLAB/Simulink.The minimum network voltage of the catenary was used as the constraint condition to simulate and analyze the length of the power supply arm matching with the different traffic densities.In order to meet the demand of the traction power supply capacity of the Golmud-Lhasa section of the Qinghai-Tibet Railway,a system design scheme using long-distance power supply technology was designed,and various traction power supply indicators under intensiverunning conditions are verified.Compared with the conventional power supply scheme,the new scheme is verified with good technical and economical efficiency.