Modeling and control of parallel dual-active-bridge converter in PET

This paper proposed a control and modeling method for parallel dual-active-bridge (DAB). A double loop control with DC bus voltage outer loop and current inner loop control method had adopted. A small signal modeling method for multiple DAB parallel systems is presented, and a small signal model of multiple DAB converters is established. Influence of voltage regulator and current regulator parameters on the system characteristics is analyzed, which provides a theoretical basis for parameter selection. Finally, the effectiveness of the proposed control method and the accuracy of the modeling method are verified by simulation analysis.