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

Abstract

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