Conversor CC/CC bidirecional em meia ponte aplicado no controle de carga e descarga de baterias em microrredes elétricas

Abstract

In this paper, a prototype of a half-bridge DC/DC converter is presented, designed to efficiently manage the charging and discharging of a battery bank within a microgrid. Utilizing PI control, the converter adjusts its operation for both islanded and grid-connected modes, ensuring effective charge control. In grid-connected mode, the electrical grid supplies power to the DC bus and feeds the connected loads. However, in islanded mode, without the presence of the grid, the battery must supply the demand for these loads. The system, simulated in SIMULINK and subsequently implemented on a test bench, is based on a structure powered by a switched-mode power supply for signals and by the electrical grid through an uncontrolled voltage rectifier that feeds a modular driver with coupled switches. The topology of the DC/DC converter stands out for its excellent cost-benefit ratio, offering robust performance relative to implementation costs, making it ideal for laboratory use. The tests showed satisfactory results for battery charging and discharging in grid-connected mode. Overall, this work not only demonstrates a viable solution for battery management within microgrids but also sets a solid foundation for future enhancements and implementations.