Day-Ahead Scheduling of Traction Power Supply System with Photovoltaic and Energy Storage Access

In recent years, in order to achieve the goal of “carbon peaking and carbon neutrality” of the electrified railway, a number of railroad energy optimization initiatives have been implemented, but with little success. To further reduce the carbon emissions of the electrified railway, its energy supply structure is changed by connecting photovoltaic and energy storage devices to the traction power supply system. First, the composite traction power supply system is constructed, and its working conditions are classified according to the composition of system energy supply. Then, the priorities are set based on the priorities of system operation constraints, and the optimal state of the system under different operating conditions is realized through hierarchical optimization. Finally, the converter capacity is reasonably optimized to achieve the minimum carbon emission under the win-win situation of the system operation performance and economic benefits. The simulation results show that the composite traction power supply system ensures the stable operation of the system while greatly reducing the carbon emission of the system and achieving the optimal performance.