Analysis and control of DAB based DC-AC multiport converter with small DC link capacitor

Multiport Converter gets growing applications due to its advantages of flexible control mode, high power density, bidirectional power delivery capability etc. In this paper, a DAB based partial isolated DC-AC multiport power converter, which combines photovoltaic panel, battery storage and grid connection is studied. Modulation method, analysis for power transmission and control design are provided. And for the proposed converter topology, a new method for DC link 100Hz ripple power compensation is proposed which can reduce DC link ripple voltage with smaller capacitor. Simulation results are presented to demonstrate the validity of the proposed control strategy.