In order to further realize the unified management of dual mode traction power supply system trends and improve the utilization of regenerative braking energy, while taking into account the management of AC negative sequence and DC traction network voltage fluctuations, as well as avoiding the problems of large footprint and high loss in the traditional cascaded H-bridge structure, this paper proposes an MMC based energy router (MER) for dual-current traction power supply system. Firstly, a multi-port topology is designed to realize the energy interaction between AC and DC traction power supply system; then, a coordinated control strategy from central to local is proposed for the objectives of regenerative braking energy recycling and power quality improvement; finally, simulation verifies the correctness and validity of the energy router topology and the control strategy.
