Closed-Loop Simulation of Dual Active Bridge (DAB) Power Electronics Topology

This document discusses the closed-loop simulation process of the Dual Active Bridge (DAB) topology in power electronics. The DAB topology is a widely-used power conversion structure that achieves efficient power transfer and control by converting electrical signals into high-frequency AC waveforms through phase-shift modulation techniques. In this article, we provide a detailed explanation of DAB operational principles, including power transfer characteristics and soft-switching conditions. For closed-loop simulation implementation, we address key considerations such as controller design (typically using PI controllers for voltage/current regulation), feedback signal processing, and modulation index calculation. The simulation approach involves modeling the power stage with switching devices and high-frequency transformers, while implementing control algorithms that calculate phase-shift angles based on error signals between reference and actual output parameters. We demonstrate how to use simulation software (such as MATLAB/Simulink or PLECS) to model DAB's closed-loop response, including techniques for implementing average-value models or detailed switching models to analyze dynamic performance and stability. The simulation setup typically involves configuring subsystems for gate signal generation, power circuit components, and feedback control loops with appropriate sampling rates and anti-aliasing filters. Finally, we discuss optimization strategies through parameter tuning and control scheme adjustments, such as implementing advanced control techniques like predictive control or frequency variation methods to enhance efficiency across different operational ranges. These optimizations help adapt DAB performance for various applications including renewable energy systems, electric vehicle charging, and DC microgrid interfaces.