Abstract
In order to deal with the computational complexity, model diversity, and lack of overall unification by the optimization strategy in the conventional time-domain piecewise analysis and optimization control of the dual-active bridge (DAB) converter, this paper has made a study of the DAB model and its optimization control in terms of frequency domain. First, a modulation method of phase-shift control is proposed so as to be convenient for the frequency-domain expression of DAB key electrical parameters. Then, the full-frequency-domain analytical expressions are deduced that refer to the primary and secondary voltages, leakage inductor current, active and reactive power, an analysis is made of the error and effectiveness of each parameter quantified by the fundamental frequency component, and a two-degree-of-freedom global optimization control strategy is proposed that makes the RMS of leakage inductor current minimal. Finally, the experimental verification is carried out. The result shows that the DAB model analysis and global optimization control method based on the frequency domain are feasible and effective.
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