Secondary Power Sharing Control Strategy for Hybrid AC/DC Microgrid via Maximum Power Coordination Factor

Proper power sharing among distributed renewable energy generators (DGs) in hybrid AC/DC microgrid is an important prerequisite for the stable system operation. In this paper, a secondary power sharing control strategy is proposed for hybrid microgrid based on a maximum power coordination factor (MPCF). Firstly, the time delay algorithm is presented to help automatically identify the MPCF within each sub-grid. Then the MPCF is employed as a unified reference to be shared with other DGs through communication. Upon this, the bidirectional interlinking converters (BIC) only needs to collect MPCF of each sub-grid to achieve accurate power sharing among the hybrid system regardless of influence from line impedance or other interference. Compared with conventional methods, the power sharing accuracy is improved and the communication burden is greatly relieved. Finally, simulation and experimental tests are conducted to verify effectiveness of the proposed strategy.