M.A. Thesis:

Hybrid Fuzzy-PID Controller for Buck-Boost Converter in Solar Energy-Battery Systems

Photovoltaic systems are very important in energy systems. In all these systems, a DC-DC converter is used as an interface between the PV array and load, which controls the output voltage of the photovoltaic system to achieve maximum power under a variety of environmental conditions. Output voltage Control of DC-DC converters have been widely implemented by using of different control techniques. We propose a hybrid fuzzy PID control system to preventovershoot and oscillations in DC-DC buck-boost converter for solar-battery system in the present work. PID, fuzzy logic and fuzzy PID hybrid Controllers are designed and simulated to stabilize the output voltage of the buck-boost converter. The dynamic response results of these controllers have been compared in terms of rise time, overshoot, and peak time and voltage fluctuations. Simulation results show the advantages of hybrid control method compared with other methods.

Keywords: Photovoltaic systems,DC-DC converters,hybrid fuzzy PID control