Dynamic Power Flow Calculation Of High-speed Railway Traction Power Supply System Based On Vehicle Network Coupling

This paper proposes a dynamic trend calculation method for traction power supply system of high-speed railroad based on vehicle-network coupling. By establishing the contact network chain equivalent circuit model, external power supply, traction substation, autotransformer and shunt components of the mathematical model, and fully consider the impedance of the traction network caused by the train movement of the dynamic changes, put forward a dynamic chain circuit model that can reflect the real-time power distribution of the train. The voltage and power distribution characteristics of the system under different train operating conditions are investigated by continuous linear current calculation method. Simulation results show that the method can accurately simulate the electrical characteristics of each line in the traction power supply system, and can effectively capture the impact of train position changes on the system voltage and power, verifying the effectiveness and convergence of its application in complex electrified railroad systems. The research in this paper provides an important theoretical basis for further optimizing the design of traction power supply system of high-speed railroads and improving its operational efficiency.