Design of a SiC based triple active bridge cell for a multi-megawatt DC-DC converter

The paper describes the design methodology of a novel Triple Active Bridge cell used as the building block for modular DC-DC converters. The intended application is for Medium Voltage Direct Current grids, such as the DC collector for offshore wind farms. The latest generation of SiC MOSFET semiconductors is utilized to operate in the medium frequency range while optimizing the efficiency. The dimensioning of the main cell components, including semiconductors, transformer and DC capacitors is presented. The cell mechanical integration and cooling are also addressed.