A Renwable Electricity-Hydrogen-Integrated Hybrid DC Traction Power System

The coexistence of electricity-driven train and hydrogen-driven train is becoming an important trend for future metro transportation. This article presents a novel electricity-hydrogen-integrated hybrid DC traction power system (HDCTPS) to integrate renewable microgrid, hydrogen subsystem and DC traction power system (DCTPS). A triple active bridge converter-based metro energy router is developed to integrate efficiently those three subsystems in HDCTPS. Then, the operation and control framework of HDCTPS is established, where the four operation modes are developed according to the power characteristic of renewable energy and regenerative braking operation of DCTPS. Power management and control strategy of HDCTPS are developed to perform smooth transition between different modes. Simulation results are given to validate the proposed HDCTPS and control framework. The proposed HDCTPS, as a novel operation strategy for future metro system, is able to utilize efficiently renewable energies and regenerative braking energy to achieve energy saving.