Novel H-Infinity Controller for DAB Converter Under Constant Current Load

Dual active bridge (DAB) converters have gained significant attention in DC microgrids, particularly for applications such as electric vehicles, energy storage systems, and uninterruptible power supplies, due to their capabilities for bidirectional power transfer, high power density, and inherent soft-switching operation. Despite these advantages, DAB converters face critical challenges, including excessive current stress and high RMS currents that lead to increased losses and potential safety risks. Moreover, external disturbances, perturbations, and variable loads can severely impact system performance and stability. To address these challenges, this article utilized an innovative control strategy lever-aging a novel NSGA-II-based H-infinity algorithm. This approach efficiently automates the optimization of controller parameters, simultaneously minimizing peak and RMS current levels while enhancing robustness against system uncertainties under constant current load (CCL) conditions. Comprehensive simulation validations demonstrate the effectiveness, robustness, and rapid response characteristics of the proposed control method.