Distributed fixed-time secondary frequency and voltage control of islanded microgrids

Abstract

In this paper, a distributed secondary control scheme is proposed to restore the frequency and voltage of droop-controlled inverter-based microgrid to their nominal values, and achieve the accurate active power sharing. The main advantage of the proposed distributed control scheme is that the secondary control objectives are achieved within a fixed-time independent of the initial conditions, which makes it possible to predesign the settling time offline according to task requirement. The stability analysis of the proposed scheme is given by applying fixed-time Lyapunov theory. Finally, simulation studies in MATLAB/Simulink show the effectiveness of the proposed distributed secondary control scheme.