Analysis and Optimization of Voltage Loop Feedback DAB Circuit under Phase-shifting Control

In this paper, the Dual Active Bridge (DAB) circuit, the dual active bridge circuit, is introduced, which has broad application potential in the field of new energy and power electronics as an efficient power conversion device. The DAB circuit can realize bidirectional energy transfer and accurate voltage regulation in the battery management system and charging system, improve charging efficiency and reduce switching losses. In this paper, under the control of phase shifting, the voltage loop feedback and the PI ((Proportional-Integral) parameters with saturation integration are designed, and the simulation is carried out on this basis through sampling, the voltage at the load end and the AC(Alternating Current) measured voltage and current are analyzed, and the parameter changes in the PI link and the integration link are compared and analyzed. And the data observation of the duty cycle and phase shift are carried out, which shows that the precision and reaction time of the output parameters are up to the standard and the characteristics of fast response, only about 0.05s of output voltage and current reach a stable value. At the same time, the 100kHz switching frequency is used in this paper to decrease the harmonic content and enhance the power quality.