Abstract
Hybrid microgrids (HMG) combine AC and DC microgrids using an interlinking converter (IC) that controls the power flow between the networks and the utility grid. These HMGs allow the interconnection of variable AC and DC sources and loads. Modular Multilevel Converter (MMC) based IC enables to integrate energy storage (ES) elements into their structure, instead of the connection to the AC and DC microgrids directly. In this paper, the features of the MMC topology with respect to its two degrees of freedom control (grid and circulating current control) are explored to regulate both AC and DC microgrids in a decoupled manner. The possible power management strategies to operate under both dispatched and undispatched utility grid-connected modes, as well as islanded mode are discussed. The control strategies for the IC to achieve resilient operation under utility grid-connected low voltage ride-through (LVRT) scenarios and grid forming mode under unbalanced loads are also provided. The proposed control schemes for HMG with MMC based IC are validated through controller hardware-in-the-loop (C-HIL) simulation, and the results are explained.
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