An average consensus-based power-sharing among VOC-based distributed generations in multi-bus islanded microgrids

Abstract

This study proposes a hierarchical control structure for load power-sharing among distributed generations (DG) in a multi-bus microgrid (MG). The proposed control structure uses an average consensus-based distributed protocol (CDP) for the secondary control layer and virtual oscillator control (VOC) as a primary controller. The proposed method can nullify the power-sharing inaccuracy caused by the mismatches of the equivalent impedances seen from the outputs of DGs. The eigenvalue-based small-signal analysis is used to analyse the secondary controller and communication time-delay on system stability. The results of the stability analysis are used to design secondary controller and time-delay compensator. The validity of the proposed method is verified by both offline simulations in Matlab/Simulink and control hardware-in-the-loop (CHiL) using a real-time Opal-RT platform.