Abstract
The focus of the conducted research is on a localized low-voltage distribution microgrid network microgrid control architecture prioritizing state-of-charge coordination utilizing a frequency-watt droop curve. The research targets an optimized configuration and a coordinated control scheme for an AC-connected islanded microgrid consisting of 2 to 12 individual systems or units. The control strategy considers the individual unit's loads, total power capacity, and overall, availability to charge and discharge each unit as determined. Preliminary testing was completed on an islanded hardware-in-the-loop microgrid testbed consisting of two separate microgrids to determine an optimized scaling factor and frequency deadband given unequal inverter and battery power capacities. The scaling factor and frequency deadband were then used in a final testing scenario to illustrate how two microgrids would coordinate with the SOC balancing architecture given a power mismatch for an AC-configured microgrid. The results showed that the proposed AC configured and SOC balancing control strategy will properly manage the microgrid network while maintaining the frequency stability of the system.