Modeling and control of dual active bridge converter with two control loops and output filter

This paper deals with modeling and control strategy for a dual active bridge (DAB) converter. The generalized average modeling method is used to obtain the state-space representation of the DAB, in which the DC and the fundamental harmonic in the Fourier series expansion of state variables are considered. Transfer functions from control-to-output are determined, which will be used to define two controllers for the output current and the output voltage in a cascaded control structure. Simulations and experiments will be used to validate the operation of the proposed method.