In order to study the influence of the state of train on the power supply network of urban rail transit, it is necessary to model and analyse the DC traction power supply system and vehicles. Based on the analysis of the structure of power supply system for urban rail transit and according to the operating principle of train, the modeling method of traction power supply system is proposed. The model of DC traction power supply system and train are established in the Simulink environment. The speed, position and power of the train vary with time through simulation, so the electrical value of train operation such as voltage that changes over time can be obtained under the model. The simulation results and the measured data are consistent in the trend of change, but there is a certain difference in corresponding values (fluctuated in an acceptable range), which verifies the validity of the model. In addition, it compares the energy consumption of substations at different departure intervals.
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