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

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 8Sprache: EnglischTyp: PDF

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Morel, Florent; Fouineau, Alexis (Universite Lyon, Ecole Centrale de Lyon, Universite Claude Bernard Lyon 1, CNRS, Ampere, France & ITE Supergrid Institute SAS, France)
Stackler, Caroline (ITE Supergrid Institute SAS, France & Universite de Toulouse, Laplace, France)
Ladoux, Philippe (Universite de Toulouse, Laplace, France)
Wallart, Francois; Evans, Nathan; Dworakowski, Piotr (ITE Supergrid Institute SAS, France)

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.