Performance evaluation of minimum backflow power and current stress optimization strategy for dual-active-bridge converter

This article discusses the optimization evaluation of dual active bridge (DAB) converter under current stress optimization and minimum backflow power scheme. A large-signal model with the transferred power as the control quantity is built, and a closed-loop control method based on direct power control is proposed to realize the precise modulation of the output voltage. Based on this, the current stress optimization scheme and minimum backflow power scheme are designed by modulating the inner phase shift ratio and outer phase shift ratio. The computational results show that current stress minimization performs better compared to the minimum backflow power scheme.