SISTEMA CONVERSOR DE POTÊNCIA PARA O CARREGAMENTO RÁPIDO DE VEÍCULOS ELÉTRICOS

Abstract

The present Undergraduate Thesis presents the study, selection, design, and simulation of the main power converter topologies employed in off-board fast chargers for electric vehicles. Initially, the growing demand for charging infrastructure and the essential technical requirements for high-power charging systems are discussed, highlighting the relevance of efficiency, bidirectionality, and power quality. Among the various alternatives found in the literature, topologies for both the AC/DC stage and the isolated DC/DC stage were analyzed. Among the evaluated options, emphasis was given to the T-Type converter for the AC/DC stage and to the DAB–CLLC converter for the DC/DC stage. Based on this analysis, a computational simulation model was developed, covering the sizing of the components for each topology, the definition of modulation techniques, and other relevant design aspects, enabling the evaluation of the operational behavior of the converters. Simulations were carried out in both open-loop and closed-loop modes, in a simplified manner and still without full modeling of the control system. These simulations made it possible to assess the dynamic behavior of the selected topologies, considering their natural operation when in open loop and their initial response in closed loop. The results showed that the DAB–CLLC converter has high application potential, although it requires more advanced control methodologies due to its greater dynamic complexity. The T-Type converter, in turn, proved to be simpler to implement, although it also requires improvements in its control strategy. The study provides a solid basis for future research, enabling the understanding of the topological alternatives available for each stage of the system, as well as their respective design details and modulation techniques. Furthermore, it highlights the aspects that still require improvement, contributing to the development of more efficient, robust, and reliable fast chargers.