Network-Based Finite-Time Secondary Level Control for Critical Bus Voltage Restoration and Accurate Reactive Power-Sharing

Abstract

In this paper, we propose a finite-time distributed secondary level control of an islanded AC microgrid based on communication network among distributed generators (DGs). The proposed control strategy achieves precise voltage regulation (VR) and accurate reactive power (RP) sharing within clusters of DGs that might contain a common node, along with attaining frequency restoration. This strategy models inverter-interfaced DGs as a leader-follower multi-agent system and uses communication weights to selectively realize the aforementioned conflicting objectives at the same time. Specifically designed for a microgrid equipped with multiple critical and high RP demand buses, the proposed controllers are proved to be finite-time stable using rigorous Lyapunov analysis, along with deriving an upper bound on the settling time. Simulation results show the efficacy of proposed controllers in selectively and simultaneously eliminating the trade-off between VR and RP sharing, for the system under consideration.