Research On Special Conditions Of Heavy Haul Railway Traction Substation Based On Power Supply Capacity Model

Electrified heavy-duty railways,as the core force of the national rail transit transportation system,are conducive to promoting the sustained,healthy,and orderly development of the national economy and society.AT traction power supply system is a special power transformation and distribution system that provides power to heavy haul electric locomotive,and its working state directly affects the operation safety of transportation lines.With the intensification of competition in the domestic freight market,it is necessary to deeply explore the ultimate power supply capacity of the traction power supply system while ensuring the safe operation of the power supply system,in order to provide technical support for train dispatching and power supply operation and maintenance.Firstly,starting from the different power supply methods in the traction power supply system,the paper elaborates on the principles and characteristics of traction power supply,introduces the advantages of the fully parallel AT power supply method,and points out the difficulties in evaluating the traction power supply capacity through the particularity of the traction load.Secondly,establish a six conductor physical model for AT traction network,and provide a calculation method for the self impedance of each wire and the mutual impedance between wires in the traction network;Build a fully parallel AT traction network simulation model using RTplus,including traction substations,AT stations,and traction networks;The electric locomotive takes HX_D2B as the research object,and establishes the relevant locomotive model;The electric locomotive takes HX_D2B as the research object and establishes the relevant locomotive model.The fully parallel AT traction network and locomotive model are integrated to form a complete traction power supply system model,and the normal power supply and cross-zone power supply are carried out on the RT-plus simulation platform,and the waveform and current waveforms are obtained respectively,and the waveform trend and value are theoretically analyzed and compared with the measured data,which verifies the accuracy of the model.According to the structure of the fully parallel AT traction network,the power flow calculation based on the coupling of the vehicle network is derived,and the power supply capacity evaluation system is formed by statically using the voltage,ampacity and traction transformer capacity at the end of the catenary.Finally,after converting the numerical calculation model of the entire set of power supply assessment models,the implementation process of the power supply evaluation was designed,and the power supply capacity evaluation software system suitable for on-site demand was developed using the C#programming language and mysql database.,Power supply capacity evaluation software has the advantages of reliable operation,convenient operation and fast response speed,and the actual calculation result is the actual actual project,which effectively taps the critical power supply capacity of the Zhang Tang Railway Testing.