Estratégia de rotação das portadoras triangulares de conversores CHBMC para balanceamento do SoC de um sistema de armazenamento de energia

Abstract

This dissertation presents a strategy to balance the state of charge (SoC) of batteries in a stationary energy storage system based on a three-phase cascaded multilevel converter. The switching pattern of the semiconductor devices is generated by a level-shifted multicarrier triangular PWM technique. Because this technique leads to unequal power distribution among the modules of each phase, a ranking algorithm orders the converter modules according to their batteries’ SoC. Then, the algorithm rotates the triangular carriers to promote dynamic balancing during both charging and discharging processes. The proposed control strategy was validated through simulations in the PSCAD/EMTDC software. The results highlight the potential of the approach for stationary battery energy storage applications, particularly in scenarios involving renewable energy integration.