Power electronic traction transformers in 25 kV / 50 Hz systems: Optimisation of DC/DC Isolated Converters with 3.3 kV SiC MOSFETs

Florent Morel (1, 2) , Caroline Stackler (3, 1) , Philippe Ladoux (4) , Alexis Fouineau (1, 2) , François Wallart (1) , Nathan Evans (1) , Piotr Dworakowski (1)

1 SuperGrid Institute SAS
2 EE - Ampère, Département Energie Electrique
3 LAPLACE - LAboratoire PLasma et Conversion d'Energie
4 LAPLACE-CS - Convertisseurs Statiques

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.

Domaines: Energie électrique; Electronique; Electromagnétisme

Florent Morel, Caroline Stackler, Philippe Ladoux, Alexis Fouineau, François Wallart, et al.. Power electronic traction transformers in 25 kV / 50 Hz systems: Optimisation of DC/DC Isolated Converters with 3.3 kV SiC MOSFETs. PCIM Europe 2019; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, May 2019, Nuremberg, Germany. ⟨hal-02144476⟩