The Modeling And Simulation Of Metro Traction Power Supply System

The traction power supply system of metro is the energy source of metro operation,The traction power supply system of metro is directly related to the normal operation and safety of metro.If the traction power supply system of metro failure,it may cause economic losses,but also may create a social order disorder,Therefore,it is of great significance to study the traction power supply system of metro to ensure the safe operation of the metro.In the research work of the traction power supply system of metro,digital simulation is very effective.The reasonable model and the simulation analysis of the traction power supply system of metro can provide a powerful guarantee for the safe operation of the subway.This paper aims to establish a simulation model of the traction power supply system of metro.First of all,the structure of t the traction power supply system of metro is discussed in detail.This includes the components of the traction power supply system of metro.Then it points out the target modeling and draw the structure of the target model,this model includes external power supply model,DC traction substation model,DC bus model,catenary model and rail and earth model.Then,a more perfect and more realistic model of the traction power supply system of metro is established based on Matlab.It first builds an external power model.Then it analyzes the principle of 24 pulse rectifier,and the model of traction substation is built by using the transformer and rectifier module in Matlab/Simulink.Then it builds the DC bus model of metro traction power supply system.Finally,it uses the PI model in the component library to build the Metro contact network model and uses the four layer network structure to build the rigid rail and earth model.Then,the traction transmission system model is established based on the Matlab platform.Firstly,the structure and working principle of the system are introduced in detail.Then,this paper analyzes the control principle of the system,including the modeling of the front-end filter circuit,the modeling of the inverter circuit and the modeling of the traction load.At the end of the thesis,according to the actual parameters of Chengdu metro vehicle,the traction power supply system and the traction transmission system and the metro vehicle model are used to simulate the the traction power supply system of metro of Chengdu metro.First of all,it carries out the simulation of the traction power supply system.Then it carries on the load simulation to the traction power supply system.Finally,this paper analyzes the current characteristics of the traction network,and applies the model of traction power supply system to the fault simulation of traction power supply system.In this paper,the simulation results are compared with the fault records from the site to further verify the rationality of the model.