Centralized finite control set model predictive control for multiple distributed generator small-scale microgrids

This paper proposes a control and power sharing strategy for small-scale microgrids in both grid-connected and islanded modes based on the centralized Finite Control Set Model Predictive Control (FCS-MPC). In grid-connected mode, the controller is capable of managing the output power of each Distributed Generator (DG) and enables flexible power regulation between the microgrid and the utility grid. In islanded mode, the controller regulates the microgrid voltage and frequency, and provides a precise power sharing scheme among DGs. In addition, the power sharing can be adjusted flexibly by changing the sharing ratio. The proposed control also enables plug-and-play operation. Moreover, a smooth transition between the two modes of operation is achieved without any disturbance in the system. Case studies are carried out to verify the proposed control strategy with the PSCAD/EMTDA software package.