Study on Efficiency Optimization of Medium Frequency Transformers for Rail Transit Traction System

Power electronics transformers (PETs) have the advantages of small volume and light weight, so they have promising applications in rail transit traction systems substituting traditional transformers. The PET consists of the medium frequency transformer (MF transformer) and power electronic converters on the primary and secondary sides. Among these components, the MF transformer efficiency affects overall system power transfer capacity, and plays an important role as it determines whether the PET system could work with high performance. This paper aims at efficiency optimization of MF transformers and studies the relation between efficiency and core materials, operating parameters, and geometric parameters to give MF transformer designs some useful references.

[1]  Alex Q. Huang,et al.  High-voltage high-frequency transformer design for a 7.2kV to 120V/240V 20kVA solid state transformer , 2010, IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society.

[2]  P. L. Dowell,et al.  Effects of eddy currents in transformer windings , 1966 .

[3]  M. Steiner,et al.  Medium frequency topology in railway applications , 2007, 2007 European Conference on Power Electronics and Applications.

[4]  R. Liu,et al.  A study of volume and weight vs. frequency for high-frequency transformers , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.

[5]  I. Villar,et al.  Analysis of empirical core loss evaluation methods for non-sinusoidally fed medium frequency power transformers , 2008, 2008 IEEE International Symposium on Industrial Electronics.

[6]  Sjoerd W. H. de Haan,et al.  Integral design of 50 kW, 25 kHz dc-dc converter based on ZVS, Quasi-ZCS topology , 2006 .

[7]  J. W. Kolar,et al.  Optimized design of medium frequency transformers with high isolation requirements , 2010, IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society.