Robust power balancing scheme for the grid‐forming microgrid

Abstract

Control over the voltage and the frequency instabilities in a grid-forming microgrid due to the power mismatch conditions become the point of concern. Therefore, the study implements a self-tuned proportional–integral integrated active power–voltage drooping and reactive power–frequency boosting control strategy for the precise power sharing among the distributed generators. Furthermore, to handle the power deficit scenarios and protect the system from the blackout, a system independent and priority-based adaptive three-stage load shedding strategy is proposed. The sensitivity of the strategy depends on the system inertia and is computed according to the varying absolute rate-of-change-of-frequency. The strategy incorporates the operation of a hybrid storage system comprised of battery and supercapacitor present in the microgrid, to provide a reliable power supply to the customers for a considerable time rather than a sudden load shedding. The effectiveness of the proposed strategies is investigated on a modified IEEE 13-bus system. The study is simulated in the time domain, on the podium of MATLAB 2015b.