Comparação entre Controles Clássicos e Preditivo no desempenho de um Conversor Dual Active Bridge

Abstract

The Dual Active Bridge (DAB) convert stands out for the application on modern power grids with DC stages. Among DAB advantages, one can cite: it has galvanic isolation between converting input and output; it presents high efficiency; it enables bidirectional power flow; it shows high power density; and it can work as buck or boost. In this paper, initially two mathematical models are discussed: small- signal modeling and discrete modeling. The small-signal modeling shows better accuracy for the operation nearly the DAB rated power. The discrete modeling presents good performance for the whole range of operation. Besides that, the paper presents and discusses three control proposals: A closed-loop voltage control using PI; A closed-loop voltage control with phase-shift prediction; and a model predictive control (MPC). The strategies were evaluated observing parameters like dynamic response, steady state behavior, and transient overshoot strategies.