A simple circuit model for the islanding transition of microgrids

Abstract

This paper describes the design and control requirements that are necessary to realize a microgrid starting from components already installed on distribution grids. The main attention has been paid to the technical and control arrangements needed for ensuring a safe transition from the on-grid to the off-grid mode of the experimental microgrid built at the Polytechnic of Bari. The control strategy is based on the master-slave control, with the master unit taking care of the overall perturbation in a sort of isochronous controller. Different system conditions have been considered in the experimental tests to examine performances of the proposed control strategy during unpredicted islanding events.