Simulation and Energy Saving Analysis of Various New Urban Rail Traction Power Supply Systems
To enhance the energy efficiency of urban rail traction power-supply systems,this study investigated various strategies aimed at reducing energy consumption.An equivalent circuit model of an urban rail transit traction power supply system was initially developed based on traditional power flow calculation methods.This model considered the nonlinear characteristics of traction energy for urban rail vehicles and variations in the equivalent circuit within a multivehicle context.Subsequently,a power flow analysis method was devised utilizing the established equivalent circuit model and node voltages.Finally,using data from Hefei rail transit line 1 and results from multitrain operation simulations,the study analyzed power,voltage,and energy consumption across different traction power-supply configurations:existing systems and three new systems integrating inverter feedback,energy storage,and photovoltaic technologies.The findings indicate significant advantages for the new systems:the system with inverter feedback notably reduces traction substation energy consumption,while the energy storage system effectively reduces peak power demands.Additionally,the system incorporating photovoltaic technology achieves a substantial 24.89％reduction in traction substation energy consumption compared to the existing setup.These results serve as a valuable reference for optimizing energy efficiency and emissions reduction efforts in urban rail transit systems,offering insights into practical strategies for enhancing operational sustainability.
urban rail transittraction power supply systeminverse feedbackenergy storage systemphotovoltaic system
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