A comparative study of Three-Phase Dual Active Bridge Converters for renewable energy applications

The influence of different transformers in the operation of a three-phase dual active bridges DC-DC converter is analyzed. The transformers considered have their windings connected in star-star, delta-delta, star-delta and delta-star. The main objective of this paper is to obtain factors of merits to allow the selection of a transformer which will yield higher converter performance for a given application. These factors of merits allows estimate the losses in power semiconductors and high frequency transformers. Additionally, operation regions under soft switching are deduced for each transformer.