A fractional order proportional-integral controller design to improve load sharing between DGs in microgrid

This paper presents a control scheme based on fractional proportional-integral controller for improving the load sharing among parallel-connected inverter based distributed generation in microgrid. The control context is based on the current control in which through the use of the proposed strategy dynamically preserves the proportional power sharing properties of the DG units. The results show that the controller is locally stabilizing, without relying on the communication links between DGs, a proper power sharing among these resources as well as the minimization of circulating current. The results can also be extended for a parallel topology of inverters and hold for generic interconnections of inverters and loads.