Modeling of a converter is the prerequisite for controller design to improve the dynamic performance of power converter. Therefore

in order to investigate the dynamics of dual active bridge（DAB） converter

the participation factor is used to identify the state variables that are critical for the stability. On this basis

by neglecting the minor state variables

the previous second-order equivalent circuit of DAB converter can be simplified to provide an explicit model of DAB converter with considering the losses. The closed-form solutions of stability boundary and the major eigenvalues can

then

be derived for design purpose. Furthermore

the proposed model can reveal the DAB nonlinearity. Thereafter

a linearization control method is introduced to suppress the oscillations induced by the nonlinearity

thereby achieving remarkable improvement of the system robustness. Finally

numerical calculations and hardware-in-loop experiments are used to verify the effectiveness of the proposed reduce-order equivalent circuit and the linearization control method.