To cope with the wide access of high-proportion distributed generations, the multiport energy hub based honeycomb active distribution network is proposed and studied. With the honeycomb structure, microgrids are interconnected with multi-port energy hub through their respective public connection points. The honeycomb active distribution network has the ability to realize the mutual energy transfer among microgrids, thus to improve the accommodation of new energy. This paper proposes a hierarchical coordinated control strategy based on multi-port energy hubs to realize the stable power regulation in honeycomb distribution network with energy storage. The upper-layer control coordinates and controls the power distribution between the energy storage system. The converters at each port is controlled according to the SOC state of the energy storage system, so as to smooth the fluctuation of renewable energy within a certain period of time. The lower-layer control performs rapid compensation by feeding back the change rate of the output active power of the energy storage system to the reference current of the converter that interconnected with the AC microgrid. Therefore, the energy storage system and the converters at each port coordinately respond to transient power fluctuations in the energy hub. A hierarchical coordination control strategy including energy storage system and multi-port energy hubs is established, and the stability of the system is analyzed. The multi-port energy hub is simulated by Matlab/Simulink, and the effectiveness of the proposed strategy is verified by comparing the simulation and experimental results under different working conditions.

Multi-port energy hub;honeycomb distribution network;energy storage converter;hierarchical coordination control;stability analysis