Unbalanced Load Compensation by PowerBased Control in the Synchronous Reference Frame

Abstract

Power-based control has proven to be an effective and robust way for having a centralized control scheme in a microgrid. The scheme has a minimal communication requirement, which enables the distributed energy resources (DERs) in the system to share the load proportionally according to their capability. This paper proposes a modification of the conventional power-based control, which is applicable to the synchronous reference frame. The proposed scheme enables unbalanced load compensation, while reducing the necessary communication between the master controller and the local inverter controllers. Finally, the scheme also proposes weighting factors for reducing the voltage unbalance factor of the grid. The proposed scheme is valid for three-phase three-wire systems. The effectiveness of the scheme is shown through numerical simulations.