Compensating for Ripple Current in the Input to a Dual Active Bridge Converter Using a Series-Connencted DC Active Filter

In this study, we propose a DC active filter (DCAF) designed to compensate for ripple current in the input to a dual active bridge (DAB) converter. The DCAF is connected in series between a DC source and a DAB converter via a matching transformer. The proposed filter functions as a resistor to dissipate ripple current in the input to the DAB converter. The DC magnetic flux caused by the DC offset of the reference output voltage of the proposed DCAF can be suppressed by applying a control method to prevent DC magnetization. Experimental results demonstrate that the ripple current in the input to the DAB converter was reduced to 75.2% of its original value using the proposed method.