Adaptive sliding mode controller design for islanded microgrid

Abstract

This paper presents a robust adaptive control strategy for voltage regulation in an islanded microgrid comprising distributed generation (DG) units. The microgrid is supplied with combination of linear, nonlinear, and uncertain loads, resulting challenges such as load-induced nonlinearity and parametric uncertainties. To address these issues, an adaptive sliding mode controller (ASMC) is developed, enabling adjustment of control parameters in response to unknown load dynamics and external disturbances. The proposed ASMC ensures accurate voltage tracking even under uncertain and varying load conditions. Unlike the H-infinity controller, PID and Fuzzy PID which uses fixed parameters, the ASMC adapts to system changes, offering improved dynamic response and greater flexibility to disturbances. Comparative simulation results show efficacy in terms of dynamic response, robustness, and maintaining a stable and high-quality profile than the existing methods.