Trade-off in Minimization of Fundamental Link Current and Reactive Power using a Novel Online Calculation based Triple Phase Shift Modulator for Dual Active Bridge

The efficiency of the dual active bridge depends on amount of reactive power flows through the link and the RMS link current. This paper reports and analyses a trade-off study in minimization of reactive power and fundamental link current in dual active bridge converter using triple phase shift-based modulator. The conventional reactive power optimization method results in high zero portion in the link voltage and increases the peak of the link current and associated switch stresses. Firstly, an attempt is made to obtain the minimum link current and it results in increased reactive power exchange. Secondly, a novel modulator scheme based on online calculation is proposed to achieve desired trade-off between reactive power and fundamental current component in the transformer AC link. The detailed loss evaluation, analysis and experimental verification are presented in order to verify the proposed scheme.