Sistema conversor de potência para o carregamento de veículos elétricos baseado no conversor Dual Active Bridge (DAB)

Abstract

This work aims to design and simulate an off-board vehicle charger based on a Dual Active Bridge (DAB) DC-DC converter, which connects the DC bus of an electric vehicle to a charging station. The study explores the converter's operation as well as different control strategies, highlighting their advantages and disadvantages. Initially, the converter is analyzed in open-loop to observe its natural behavior. Then, it is controlled via power reference using a numerical polynomial adjustment method, without transfer functions. Subsequently, a control strategy based on current reference is implemented using the system's frequency response. Two types of controllers were investigated: the first combines a phase lead compensator with a PID controller, while the second involves direct manual pole-zero placement at the relevant frequencies. Both methods were analyzed in terms of performance and stability. The controllers exhibited underdamped behavior, with no overshoot and good phase margin; however, the manual pole placement controller displayed more noise and oscillations in steady-state, whereas the phase compensation combined with PID provided a more stable response.