Simulation Research of Psophometric Current of Urban Rail Train Based on Matlab/Simulink

With the continuous development of urban rail transit, the problem of noise interference caused by the traction harmonic current of urban rail trains to the communication lines along the route has become increasingly prominent. To thoroughly investigate and effectively address this phenomenon, this study utilizes the Matlab/Simulink software platform to build a combined vehicle - network simulation model of the DC traction power supply system and the traction conduction system of a specific type of urban rail train, simulating the train's operating state under acceleration conditions. Based on the established model, the characteristics of the psophometric current at different distances between the train and the power supply station are analyzed, and the variation law of the psophometric current with the distance between the train and the power supply station is obtained. The modeling method proposed in this study can predict the psophometric current of DC - powered urban rail trains. It can also play an important role in the preliminary research stage of different vehicle - network systems in rail transit, providing a powerful simulation analysis tool for the optimal design and performance evaluation of the systems.