Power electronic traction transformers in 25 kV / 50 Hz systems:
Optimisation of DC/DC Isolated Converters
with 3.3 kV SiC MOSFETs
Abstract
In AC electric trains, power electronic traction transformers (PETT) are multilevel single phase AC/DC converters connected to the AC medium voltage overhead line. For indirect topologies, DC/DC isolated converters are key elements of PETTs. This paper shows a method to design such DC/DC converters, and several variants are considered. Finally, the comparison results, in the case of a 25 kV / 50 Hz power supply and 3.3 kV SiC MOSFETs, show that the variant with a resonant AC link, with only one controlled bridge and a switching frequency lower than the resonant frequency, offers the best efficiency at rated power for a given volume.
Florent MOREL (1,2), Caroline STACKLER (2,3), Philippe LADOUX (3),
Alexis FOUINEAU (1,2), François WALLART (2), Nathan EVANS (2), Piotr DWORAKOWSKI (2)
(1) Université Lyon, Ecole Centrale de Lyon, Université Claude Bernard Lyon 1, CNRS, Ampère, France
(2) SuperGrid Institute SAS, France
(3) Université de Toulouse, Laplace, France
Corresponding author:
Florent MOREL, florent.morel@supergrid-institute.com
