An Efficient Voltage Compensation and SoC-based Power Management in DC Microgrid

Direct current (DC) microgrids have recently acquired popularity because of their high efficiency, lack of frequency control and reactive power concerns, ease of integration of energy storage devices (ESDs), and direct connection of DC sources and loads. Controlling DC microgrids, on the other hand, is complex due to the coordination of various ESDs and distributed generators (DGs). In DC microgrid, voltage control and power management become challenging tasks as DGs, ESDs, and loads are connected to a DC bus. In this paper, state of charge (SoC) based power management and fractional order integral voltage compensation are proposed for DC microgrid. A complete mathematical model is developed for the proposed controller to facilitate controller parameter tuning. The DC microgrid consists of batteries, DGs, and loads. The fractional-order voltage compensation improves the DC voltage significantly as compared to the conventional controller, while the SoC-based power management scheme provides rapid SoC balancing among the ESDs. The proposed controller shows excellent performance in terms of voltage control and SoC balancing over the existing approach, as depicted by the simulation results.