Abstract
DC microgrids are getting more attention from utilities due to increasing DC sources and loads. DC microgrids have several advantages over AC microgrids, such as lower power loss, higher efficiency, and smaller size. Unlike AC grids, DC microgrids are exposed to small disturbances in their sources. DC sources' output power varies due to the weather uncertainties, and output power deviations in AC sources have constant ripples resulting from AC/DC converters that may cause instability. DC microgrids' stability depends on DC bus voltage deviation, especially with constant power loads (CPLs). In this paper, a reduced-order distributed tube-based model predictive control (TB-MPC) is proposed and designed for a two-area microgrid to ensure the system's stability in the presence of small disturbances in the sources. The effectiveness and performance of the reduced-order distributed TB-MPC is evaluated via simulations in comparison to the centralized TB-MPC approach. The results display a notable improvement in disturbance rejection by employing the reduced-order distributed TB-MPC.
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