Optimal sizing of a power electronic traction transformer
for railway applications
Many works are dedicated to power electronic transformers in order to replace line frequency transformers. These new converters offer many degrees of freedom (switching frequency, magnetic material, rated voltage for switches. . . ). This paper presents a methodology to optimize the sizing of such power converters in order to compare different topologies for a given application. The proposed procedure maximises the efficiency of the converter under a limited volume. In this paper, the methodology is applied to compare different topologies of power electronic traction transformer (PETT) for railway applications. The considered case is a 2 MW converter supplied by a 25 kV- 50 Hz catenary. The procedure is illustrated in simulation on a converter with 3.3 kV SiC switches. The best obtained efficiency is 98.9 % with 23 medium frequency transformers (MFT) of 28.6 L each.
Keywords — epoxy composites; hexagonal boron nitride; AC breakdown strength; DC conductivity; electrical conduction mechanisms.
Caroline Stackler (∗ y), Florent Morel (y z), Philippe Ladoux (∗), Alexis Fouineau (y z), Franc¸ois WALLART (y), Nathan Evans (y)
(∗) Université de Toulouse, INPT, UPS, CNRS, LAPLACE (Laboratoire Plasma et Conversion d’Energie)
ENSEEIHT, Toulouse, France
(y) ITE SuperGrid Institute SAS, Villeurbanne, France
(z) UDL, Ecole Centrale de Lyon, Universite Claude Bernard Lyon 1, CNRS, Ampère, F-69130, Ecully, France
Conference: IECON 2018
(1) University of Lyon, CNRS, UMR 5223
Ingénierie des Matériaux Polymères
69621 Villeurbanne, France
(2) SuperGrid Institute
69611 Villeurbanne, France