Design of a buck converter battery charging controller in PV plant

A smart grid can be made up of electrical system components and communication networks connected by complex relationships. The power system considered in this study is constructed by 135W panels with battery storage. This paper presents the design of a battery charging circuit by a maximum power point tracking algorithm MPP based on the perturb and observe method. This photovoltaic system associated with a DC-DC boost converter driven by the P&O technique in order to improve the efficiency and the output voltage under illumination change between 500-1000W/m(2). A Buck converter controlled with a PID regulator and supplied by the output voltage of the first converter form a battery charging circuit. The goal of this work is to function the PV system in variable environmental conditions to have a good efficiency and minimize the overall costs of the system as well as reduce the losses of the battery and improve its condition and increase its life cycle. This system is studied and simulated in MATLAB/SIMULINK environment.