Soft-switching – The Key to High Power WBG Converters

This paper proposes that viable high-voltage high-power converters using wide band-gap SiC devices, will require the use of soft-switching, in particular zero-voltage switching techniques, if system parasitics and high switching speeds are to be managed. An easy to understand and use quantitative comparison of different approaches can help us with selection of specific technologies for given applications. This paper presents the limitations of current approaches, and proposes a new converter figure of merit (CFOM) as the basis for understanding the limitations of high power converters based on wide band-gap SiC devices, showing that soft-switching is the key.

[1]  William McMurray,et al.  The Thyristor Electronic Transformer: a Power Converter Using a High-Frequency Link , 1971 .

[2]  D.M. Divan,et al.  A three-phase soft-switched high power density DC/DC converter for high power applications , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[3]  Rik W. De Doncker,et al.  Development and demonstration of a medium-voltage high-power DC-DC converter for DC distribution systems , 2014, 2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems (PEDG).

[4]  Subhashish Bhattacharya.  Transforming the transformer , 2017, IEEE Spectrum.

[5]  G. Venkataramanan,et al.  A Comparative Evaluation of Series Power-Flow Controllers Using DC- and AC-Link Converters , 2008, IEEE Transactions on Power Delivery.

[6]  Hao Chen,et al.  Soft-Switching Solid-State Transformer (S4T) , 2018, IEEE Transactions on Power Electronics.

[7]  David E. Grider,et al.  10 kV, 120 A SiC half H-bridge power MOSFET modules suitable for high frequency, medium voltage applications , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[8]  M. Otsuki,et al.  Low EMI Techniques for New Generation IGBTModules , 2008 .

[9]  Hirofumi Akagi,et al.  Bidirectional Isolated Dual-Active-Bridge (DAB) DC-DC Converters Using 1.2-kV 400-A SiC-MOSFET Dual Modules , 2016 .

[10]  Nadir Idir,et al.  Active gate voltage control of turn-on di/dt and turn-off dv/dt in insulated gate transistors , 2006, IEEE Transactions on Power Electronics.

[11]  Johann W. Kolar,et al.  Electrical shielding of MV/MF transformers subjected to high dv/dt PWM voltages , 2017, 2017 IEEE Applied Power Electronics Conference and Exposition (APEC).

[12]  Alex Q. Huang,et al.  Design and hardware implementation of Gen-1 silicon based solid state transformer , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[13]  Johann W. Kolar,et al.  Common-mode currents in multi-cell Solid-State Transformers , 2014, 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA).