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This paper presents a novel grid-forming voltage control strategy for abattery energy storage system to maintain balanced three-phase output voltageswhen serving unbalanced loads. A stationary reference frame ($\alpha \beta$)based control scheme is proposed to regulate positive-sequence andnegative-sequence voltages. Compared with the conventional rotating referenceframe ($dq$) based control scheme, the proposed scheme shows better dynamicperformance. Then, we analyze the system zero-sequence network and proposeadding a grounding transformer to the Y/Yg connected output transformer tofurther reduce the voltage unbalance at the point of common coupling. Thesimulation results demonstrate the effective performance of the proposedvoltage control scheme. Based on the results, the power-voltage unbalance curveis derived for different output transformer configurations to establish therelationship between the power unbalance limit and the voltage unbalance limitfor microgrid power scheduling.

A Novel Grid-forming Voltage Control Strategy for Supplying Unbalanced Microgrid Loads Using Inverter-based Resources