Digital-twin based Power Supply System Modeling and Analysis for Urban Rail Transportation

The construction of extra-large smart cities needs efficient and energy-efficient rail transit infrastructure to provide smart and eco-friendly life. In order to improve the planning and design level of urban rail transportation and realize the recovery and reuse of train traction braking energy. Combined with the digital twin technology, this paper analyzed the characteristics of various components in the traction power supply AC-DC hybrid network, including the rectification and inverter characteristics, the charge and discharge characteristics of the energy storage device, and the impact of the train converter on the system. Their mathematical models were constructed. A source-network-load-storage interaction model was established in MATLAB/Simulink environment. Finally, a three-stations between two-intervals model was built, which can simulate the normal operation of the system. Based on the voltage protection strategy settings, the stability of the system operation is verified.