Modeling and simulation of conventional DC-DC converters deticated to photovoltaic applications

Abstract

This paper presents a comprehensive study of photovoltaic system using three topologies of DC-DC converters with extraction of maximum power. A mathematical model presenting an equivalent electric circuit of the PV module is presented as well as the determination of various internal parameters. A comparison of two strategies of connection (direct and through a conditioning stage) between PVG and a resistive load is presented citing advantages and drawbacks . The used adaptation stage consists on a research control of the maximum power point tracking MPPT (perturbation observation method P & O), which ensures the extraction of the maximum available power from the PV array. A modeling of three basic topologies converter (buck, boost and buck-boost) is implemented. The sizing of each passive element of the converters and the principle of operation is described. Simulation results are presented and discussed. Results demonstrate the validity of the models.