A master/slave control of distributed energy resources in low-voltage microgrids

The paper deals with the control of low-voltage microgrids with master/slave architecture. Distributed energy resources (DERs) are interfaced to the grid by means of conven- tional inverters (slave units), and a microgrid master controller (master unit) governs the interaction between the utility and the microgrid at the point of common coupling with the main grid. The power sharing among the available resources is achieved by the power-based control, a technique which allows to pursue both local (DER level) and global (microgrid level) optimization goals. The paper overviews and analyzes the control algorithm and focuses on how the considered approach can be employed to attain effective modes of operation in microgrids. Simulation results supporting the proposed approach are finally provided.