Abstract
Advancements insilicon carbide (SiC) power modules having high-blocking- capacity enable the development of the next generation of highly efficient and highly power dense conversion units for medium-voltage applications without implementing complex multilevel topologies. This paper presents the design and testing of a l50-kW medium-voltage (MV) three-phase dual active bridge (DAB) using lO-kV Wolfspeed SiC MOSFETs for MV AC and DC grid applications. The DAB is designed for a MV of 5 kV dc and a low voltage of 400 V dc. A high efficiency, low-parasitic capacitance, lO-kHz three-limb three-phase transformer with integrated leakage inductance for rated power transfer is used to provide galvanic isolation. The proposed prototype was experimentally validated up to 45 kW with an input voltage up to 4 kV. Experimental current and voltage waveforms are provided for each operating condition for validation purposes.
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