Robust H∞ fuzzy saturated control of photovoltaic system

This paper is focused on robust H∞ fuzzy Maximum Power Point Tracking (MPPT) of photovoltaic (PV) system under actuator asymmetric saturation and different climate conditions. To adjust the output PV voltage, a DC-DC boost converter is used. This last is controlled by duty ratio that is remains practically saturated between 0 and 1. In order to consider of input limited, firstly, a polytopic model is investigated in fuzzy integral state feedback controller. Secondly, H∞ stabilization conditions are derived in linear matrix inequalities (LMI) terms based on Takagi-Sugeno (T-S) fuzzy model and Lyapunov approach. Finally, the proposed control is applied to a PV system and our simulation results show the effectiveness of the proposed approaches.