Robust L₁ fuzzy adaptive controller for three-phase grid-connected photovoltaic system

A robust L-1 fuzzy adaptive controller is proposed in this paper for a grid-connected photovoltaic (PV) system. The latter contains a solar PV array connected to a three phase grid through a DC/AC inverter. The designed controller consists of a control law, an adaptive mechanism and a predictor. A fuzzy system is incorporated in the controller structure to achieve a good approximation of unknown nonlinear dynamics and uncertainties. Unlike conventional adaptive control strategies, the proposed control method permits fast adaptation without compromising robustness. Therefore, it can significantly improve the control performance of this type of energy conversion systems characterized by fast dynamics. Furthermore, the presented control scheme ensures the stability of the closed-loop system with bounded transient and tracking performance. (C) 2022 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.