Decoupling Control with Kalman Filter for Quad-Active-Bridge Converter

Conventional decoupling control can effectively manage voltage regulation in quad-active-bridge (QAB) converter, however, the equivalent inductance in QAB converter will perturbate due to changing operation frequency and environmental temperature, which inevitably impacts the voltage control performance of conventional decoupling control. To address this issue, this article proposes a decoupling matrix-based PI method integrated with Kalman filter to eliminate the parametric effect on voltage control. The feasibility and benefits of the proposed control method is verified by simulations.