A Hierarchical Architecture for Power Management in Interconnected DC Microgrids

Enhancing the storage capacity to improve the reliability of standalone DC systems caused by the intermittency of Renewable Energy Sources (RESs), raises the cost and maintenance requirements. Interconnections of DC MicroGrids (DC MGs) can address this issue and it also has various benefits such as higher efficiency, resilient operation, no synchronisation and reactive power requirements. This work introduces a novel coordinated hierarchical power management strategy of interconnected DC MG. With DC bus voltage regulation, SoC balancing and optimal power sharing via Interlinking Bidirectional Converters (IBCs), the proposed power management strategy provides efficient load dispatch by optimal utilisation of resources. The results are validated in MATLAB/Simulink for different modes of operation.