VSG-VFOC Pre-Synchronization Control for Graceful Mode Transition of Inverter-Based AC Microgrid

This paper presents a novel virtual synchronous generator (VSG) based multi-loop control solution with the virtual flux oriented control (VFOC) aiming to efficiently manage the microgrids under dynamics. The pre-synchronization control aligned to the outer loop of such VSG-VFOC solution is investigated to ensure smooth microgrid operational transition between island to grid-connected modes. Simulation results in comparison with voltage oriented control (VOC) clearly validate the effectiveness of the proposed solution in timely current response and static error free tracking control of output voltage.