Analytical Equations of the Currents in Dual Active Bridge Converter for More Electric Aircraft

Abstract

Volumetric and gravimetric power density improvements are one of the main objectives in More Electric Aircraft (MEA). The number of variables which influence both parameters is wide, and its impact is difficult to predict. Also, there are many applications in which DAB converter is employed, as energy-storage systems (ESS) or power flow regulation among DC buses. The selection of the most appropriate modulation is a design challenge. Therefore, this paper presents the analytical equations of switching, RMS and AVG currents for different modulation methods proposed in literature for DAB converter. To this end, voltage and current waveforms through the transformer have been characterized. Afterwards, these waveforms are employed to extract the analytical equations of the currents for future power losses evaluation. Finally, PLECS simulation model have been developed to validate the analytical equations obtained in this paper for a MEA case study.