Multi-port Electric Energy Router without Centralized DC Bus

This paper proposes a topology of multi-port energy router without centralized DC bus which meets the requirements of distributed port shore power system access and multiple shore power pile output operation. This topology achieves efficient and economic operation of the shore power system and ensures flexible grid connection of multiple new energy access. Meanwhile, it actively supports the frequency and voltage stability of the regional distribution network. The topology has three access ports, which can realize plug-and-play access of multi-voltage source load. In addition, a master-slave control strategy is proposed to achieve power regulation and voltage of DC load-side stabilization at each port. Compared with the traditional common bus topology, the number of power conversion stages between adjacent ends is reduced, which lowers the overall power loss. In the meantime, the two topologies are compared and analyzed with typical energy use scenarios of different voltage levels and multiple port loads. Finally, the correctness and effectiveness of the proposed topology and the control strategy are verified by PLECS simulation platform.