Resilient Secondary Voltage Control of Islanded Microgrids: An ESKBF-Based Distributed Fast Terminal Sliding Mode Control Approach

TL;DR

This paper introduces a resilient distributed secondary voltage control method for islanded microgrids, combining extended state Kalman-Bucy filtering with fast terminal sliding mode control to enhance stability and convergence amid uncertainties.

Contribution

It presents a novel integrated control approach using ESKBF and FTSM for microgrid voltage regulation, addressing multiple uncertainties and improving response speed.

Findings

Effective disturbance estimation via ESKBF

Enhanced stability and convergence with FTSM

Validated performance through simulations and experiments

Abstract

This paper proposes a distributed secondary voltage control method based on extended state Kalman-Bucy filter (ESKBF) and fast terminal sliding mode (FTSM) control for the resilient operation of an islanded microgrid (MG) with inverter-based distributed generations (DGs). To tackle the co-existence of multiple uncertainties, a unified modelling framework is proposed to represent the set of different types of disturbances, including parameter perturbation, measurement noise, and immeasurably external variables, by an extended state method. Kalman-Bucy filter is then applied to accurately estimate the state information of the extended DG model. In addition, based on the accurate estimation, a fast terminal sliding mode (FTSM) surface with terminal attractors is designed to maintain the system stability and accelerate the convergence of consensus tracking, which significantly improves the performance of secondary voltage control under both normal and plug-and-play operation. Finally, case studies are conducted in both MATLAB/Simulink and an experimental testbed to demonstrate the effectiveness of the proposed method.