Distributed Adaptive AC Droop Control in D-Q Coordinates for Inverter-Based Microgrids

Droop control is a conventional method for operation of local distributed sources. Typical issues for droop control schemes include current sharing mismatch and voltage deviation, both likely to occur in a Microgrid (MG) setting. This paper proposes an adaptive droop scheme in d-q coordinates to compensate for current sharing mismatch at primary control level and voltage deviation compensation at secondary control. The droop resistances are adjusted for both d and q subsystems to eliminate the current sharing mismatch, and the droop voltage shifting method has been implemented to compensate for the voltage deviation. The dynamics of the proposed control is demonstrated for a three-phase reduced-order MG system using OpenModelica.