Reactive power reduction method based on harmonics analysis for dual active bridge converters with 3-level modulated phase-shift control

This paper presents a novel reactive power minimization method under 3-level modulated phase-shift control in order to improve the efficiency for a wide range. Firstly a mathematic model of the DAB converter with 3-level modulated phase-shift control by a harmonic analysis method is obtained. Then, the detailed analysis of the odd order harmonic component of the active and reactive varied with the multiple control dimension is presented. On this basis, a novel optimal 3-level phase-shift control (OPS) strategy for reducing reactive power is proposed. Main simulation and experimental results by using the tradition method and the optimal reactive power reducing method are provided to verify the effectiveness of OPS method.