J. W. Kolar and G. Ortiz, Solid-state-transformers: key components of future traction and smart grid systems, Proceedings of the International Power Electronics Conference-ECCE Asia, p.2014, 2014.

A. Prasai, J. Yim, D. Divan, A. Bendre, and S. Sul, A new architecture for offshore wind farms, IEEE Transactions on, vol.23, pp.1198-1204, 2008.
DOI : 10.1109/epe.2007.4417344

T. Lagier and P. Ladoux, A comparison of insulated DC-DC converters for HVDC off-shore wind farms, 2015 International Conference on Clean Electrical Power (ICCEP), 2015.
DOI : 10.1109/ICCEP.2015.7177597

D. Dujic, F. Kieferndorf, F. Canales, and U. Drofenik, Power electronic traction transformer technology, Proceedings of The 7th International Power Electronics and Motion Control Conference, 2012.
DOI : 10.1109/IPEMC.2012.6258820

A. Garcia-bediaga, I. Villar, A. Rujas, L. Mir, and A. Rufer, Multiobjective Optimization of Medium-Frequency Transformers for Isolated Soft-Switching Converters Using a Genetic Algorithm, IEEE Transactions on Power Electronics, vol.32, issue.4, pp.2995-3006, 2016.
DOI : 10.1109/TPEL.2016.2574499

M. Leibl, G. Ortiz, and J. W. Kolar, Design and Experimental Analysis of a Medium-Frequency Transformer for Solid-State Transformer Applications, IEEE Journal of Emerging and Selected Topics in Power Electronics, vol.5, issue.1, pp.110-123, 2017.
DOI : 10.1109/JESTPE.2016.2623679

M. Mogorovic and D. Dujic, Medium frequency transformer leakage inductance modeling and experimental verification, 2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017.
DOI : 10.1109/ECCE.2017.8095813

URL : https://infoscience.epfl.ch/record/231298/files/2017_ECCE_Mogorovic.pdf

K. J. Binns and P. J. Lawrenson, Analysis and Computation of Electric and Magnetic Field Problems, Pergamon International Library of Science and S. Studies, 1973.

P. Hammond, Electric and magnetic images, Proceedings of the IEE - Part C: Monographs, pp.306-313, 1960.
DOI : 10.1049/pi-c.1960.0047

V. S. Duppalli and S. Sudhoff, Computationally efficient leakage inductance calculation for a high-frequency core-type transformer, 2017 IEEE Electric Ship Technologies Symposium (ESTS), 2017.
DOI : 10.1109/ESTS.2017.8069348

E. Billig, The calculation of the magnetic field of rectangular conductors in a closed slot, and its application to the reactance of transformer windings, Proceedings of the IEE -Part IV: Institution Monographs, pp.55-64, 1951.

T. Guillod, J. Huber, F. Krismer, and J. Kolar, Litz wire losses: Effects of twisting imperfections, 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), 2017.
DOI : 10.1109/COMPEL.2017.8013327

URL : https://www.research-collection.ethz.ch/bitstream/20.500.11850/187502/1/16_Litz%20Wire%20LossesEffects%20of%20Twisting%20Imperfections_Guillod_COMPEL%202017.pdf

J. Acero, R. Alonso, J. M. Burdio, L. A. Barragan, and D. Puyal, Frequency-dependent resistance in Litz-wire planar windings for domestic induction heating appliances, IEEE Transactions on Power Electronics, vol.21, issue.4, pp.856-866, 2006.
DOI : 10.1109/TPEL.2006.876894

P. L. Dowell, Effects of eddy currents in transformer windings, Proceedings of the Institution of, pp.1387-1394, 1966.
DOI : 10.1049/piee.1966.0236

J. A. Ferreira, Improved analytical modeling of conductive losses in magnetic components, IEEE Transactions on Power Electronics, vol.9, issue.1, pp.127-131, 1994.
DOI : 10.1109/63.285503

A. Reatti and M. K. Kazimierczuk, Comparison of various methods for calculating the AC resistance of inductors, IEEE Transactions on Magnetics, vol.38, issue.3, pp.1512-1518, 2002.
DOI : 10.1109/20.999124

F. Tourkhani and P. Viarouge, Accurate analytical model of winding losses in round Litz wire windings, IEEE Transactions on Magnetics, vol.37, issue.1, pp.538-543, 2001.
DOI : 10.1109/20.914375

M. Bartoli, N. Noferi, A. Reatti, and M. K. Kazimierczuk, Modeling Litz-wire winding losses in high-frequency power inductors, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference, 1996.
DOI : 10.1109/PESC.1996.548808

C. R. Sullivan, Optimal choice for number of strands in a Litz-wire transformer winding, IEEE Transactions on, vol.14, pp.283-291, 1999.

M. Albach, Two-dimensional calculation of winding losses in transformers, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018), pp.1639-1644, 2000.
DOI : 10.1109/PESC.2000.880550

R. Prieto, J. A. Cobos, V. Bataller, O. Garcia, and J. Uceda, Study of toroidal transformers by means of 2D approaches, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972, 1997.
DOI : 10.1109/PESC.1997.616786

R. Wojda and M. K. Kazimierczuk, Winding resistance of litz-wire and multi-strand inductors, IET Power Electronics, vol.5, issue.2, pp.257-268, 2012.
DOI : 10.1049/iet-pel.2010.0359

R. Wojda and M. K. Kazimierczuk, Winding resistance and power loss of inductors with Litz and solid-round wires, IEEE Transactions on Industry Applications, 2018.

A. T. Phung, G. Meunier, O. Chadebec, X. Margueron, and J. P. Keradec, High-Frequency Proximity Losses Determination for Rectangular Cross-Section Conductors, IEEE Transactions on Magnetics, vol.43, issue.4, pp.1213-1216, 2007.
DOI : 10.1109/TMAG.2007.892303

URL : https://hal.archives-ouvertes.fr/hal-00193340