Projeto e análise de um conversor CC-CC Buck-Boost com aplicação de método de rastreamento de máxima potência

Abstract

This monograph is dedicated to the study and design of a CC-CC Buck Boost static conversor for the application of maximum power point tracking method (MPPT) in photovoltaic generation systems. Photovoltaic systems use DC-DC converters to adjust voltage and curent levels to those requested by the load, necessitating the integration of a device to increase the efficiency of the power supply by the photovoltaic panel. This feature is called MPPT, which consists of controlling the change in the cyclic ratio of the converter key so that the optiomum point of operation is reached. With this system, it is possible to extract the maximum energy from the panel, reducing effects such as irradiance and temperature variations. To achieve the proposed objectives, a literature review was performed involving the principles of operation of photovoltaic generation, defining the mathematical model of the photovoltaic cell. Following is the screening methods selected for this study, the Perturbation and Observer, Incremental Conductance, and the Temperature. After that, the Buck-Boost converter operation principles were approached, demonstrating its electrical characteristics, the equation to dimension the circuit components, waveforms and the generation system simulation applying the selected methods. The results of this work were obtained by simulation using the PSIM software. Finally, the prototypes were elaborated and connected with the KD 140SX module for the validation of the workbench system, aiming to find out which one has the gighest maximum power point tracking factor, so that, finally, there is a increased efficiency of photovoltaic system generation.