Conversor estático de três estágios para carregamento de baterias a partir de sistemas eólicos

Abstract

This dissertation presents the analysis, design, simulation and experimental results for a two stages static converter feasible to small battery charging wind systems. The choice of the structure was made through a brief literature review. The system employs a boost converter cascaded with a Graetz bridge, what allows the implementation of a Maximum Power Point Tracker (MPPT) and the reduction of the mechanical speed in battery overvoltage situations. Also, a buck converter is connected in series with the boost to ensure a constant voltage bus between the aforementioned topologies. Thus, it is possible to extract the maximum power for all wind speed range, and a battery charging can be realized through conventional techniques. The complete design of the proposed battery charger with power, control and supervisory circuits are presented and developed, considering a 300W system, with the possibility of charging battery banks of 12V or 24V. Simulation results are presented to prove the existence of maximum power points in the wind generator and verify the behavior of the designed converters. Finally, the static and dynamic experimental results of the developed prototype required to validate the functionality of the proposed study are presented and discussed.