Controlador de carga de baterias utilizando o conversor CC-CC bidirecional buck-boost.

Abstract

The purpose of this work involves the study and development of a bidirectional converter as an interface between the DC bus and the battery system, acting as a battery charge controller, with the purpose of maintaining the voltage on the DC bus regulated through control. of the power flow. The system presented consists of a bidirectional DC-DC converter, which can act as a voltage raiser (Boost) or lowerer (Buck) depending on how the switches are activated. The proposed topology enables bidirectional energy transfer, allowing the battery bank to act as a load during charging or as a source when supplying energy to the bus, adapting to the characteristics of each process and ensuring a smooth transition between them. A comprehensive analysis is conducted through linearly averaged small-signal circuit modeling for continuous conduction mode operation. To validate the models obtained, the transfer functions of the converter circuit operating as Buck and Boost are presented and employing control techniques, the closed loop design is carried out to meet the bidirectional power flow and battery charging and discharging processes. ensuring the output power required for the load and longer battery life, as current ripple is a phenomenon that influences the life of batteries in energy storage systems. The computer simulation of the system and the mathematical calculations to aid the design of the compensators were carried out using MATLAB software. Finally, with the data obtained and analyzed, conclusions were presented.