Abstract
Poor power sharing of hybrid ac/dc microgrid leads to the inefficient operation of distributed generators (DGs). Besides, the lack of inertia caused by droop and phase-locked loop-based current control brings negative effects to the system. In this article, we propose a distributed normalized power coordination (NPC) embedded with virtual synchronous generator for hybrid microgrid. The proposed NPC controller can achieve cross inertia support, accurate global power sharing, and frequency/voltage recovery among dispatchable DGs simultaneously. Furthermore, to suppress frequency and power oscillation, the index of inertia deviation is proposed to guide the inertia placement of hybrid MG based on Participation Factor analysis. Finally, the proposed strategy is validated by the simulation and hardware-in-loop tests compared to the conventional methods.
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