A Novel Distributed Secondary Voltage Control Strategy in Islanded Microgrids Using Finite Time Extended State Observer and Sliding Mode Control

This article presents a novel strategy for distributed secondary voltage control in islanded microgrids (MGs). The proposed approach integrates Finite Time Extended State Observer (FTESO) and Sliding Mode Control (SMC). Initially, we establish the nonlinear mathematical model for distributed generators (DGs). Subsequently, the feedback linearization method is employed to formulate a second-order linear system, with voltage as the output and the secondary control signal as the input. To handle immeasurable variables within second-order linear systems, we design an FTESO to observe the system states. Finally, leveraging the observed states, we develop a distributed secondary voltage control method based on SMC. Simulation results conducted using MATLAB/SIMULINK validate the effectiveness of the proposed approach presented in this article.