Energy-Storage Based Multilevel Voltage-Balancing DC-DC Converter in Urban Rail Transit

The traditional DC traction power supply system generally shows low utilization rate of train braking energy. High-voltage DC autotransformer traction power supply system (HDATPS) has been introduced to solve the problems. To further improve the utilization of train braking energy, an energy-storage based multilevel voltage-balancing DC-DC converter (ES-MVBDC) is proposed in this paper. Both operation principles and energy storage control strategy are discussed in detail. Finally, the simulation model of ES-MVBDC is built to verify the feasibilities and effectiveness of above theoretical analysis.