Abstract
DC microgrid clusters enhance reliability and effective utilization of resources. In this paper, a hierarchical power management strategy is proposed for two DC microgrids interconnected through dual active bridge (DAB) converter. The control hierarchy consists of droop control to ensure proportional power sharing within the microgrid, DC bus signalling control which controls power exchange between two microgrids through DAB and droop shifting control to compensate the voltage drop caused by droop control. The amount of power to be exchanged between microgrids is determined through fuzzy logic controller based on DC bus voltages of microgrids. Then small signal model is developed to analyse the effect of parameter variation for stable operation of system. Finally the proposed strategy is validated through simulation using Matlab/Simulink.
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