IEEE Power Electronics Magazine - December 2014 - 11

FEC dc bus (22 kV) is isolated from
the low-voltage side dc bus (800 V)
using a high-frequency link, which is
a dual active bridge (DAB)-isolated
dc-dc converter. The DAB is softswitched at 10 kHz with three singlephase HV transformers. The three
low-voltage/high-current converters
using 1,200-V/100-A SiC MOSFETs are
connected in parallel at the output
stage of the TIPS. Each converter is
switched at 17-20 kHz and interleaved to achieve an overall switching frequency of 50-60  kHz and,
hence, a reduction in the overall filter
size with general TIPS efficiency
of 98%. The output stage is connected
to the 480-V utility grid or threephase loads.
Besides studying the switching
characteristics of 15-kV SiC N-IGBTs
and 10-kV SiC MOSFETs and their usage in medium-voltage grid-tied applications, researchers at FREEDM

Systems have also designed and developed gate drivers for the high-voltage SiC IGBTs and MOSFETs, with
15-kV isolation voltages, says Bhattacharya. In short, the key challenges
that researchers are trying to address
for the SST applications include size
and weight reduction using ultrahighvoltage SiC power devices, multistage
control, mitigation of electromagnetic interference resulting from fast
switching, and the evaluation of softswitching methods for further optimized performance.
Bhattacharya says that researchers are currently in the process of
demonstrating 3L-NPC converterbased multistage SST interfaced with
a 13.8-kV ac, three-phase grid.
Next, the researchers are developing a three-phase SST with the same
ratings with 15-kV SiC MOSFETs
(newly developed by Cree) and also
with 10-kV SiC MOSFETs (already de-

December 2014

veloped by Cree and being qualified
under the new national network for
manufacturing innovation institutebased wide-bandgap initiative).
The research and development
of the TIPS project has been supported by the U.S. Defense Advanced
Research Projects Agency-Energy
(Department of Energy) through U.S.
government funding. The SiC devices
have been designed, developed, and
packaged by Cree and Powerex. The
device testing and system hardware
demonstration of 13.8-kV grid-tied,
100-kW TIPS is being carried out
at FREEDM Systems. The NCSU
team comprises Arun Kadavelugu,
Awneesh Tripathi, Sachin Madhusoodhanan, Dhaval Patel, Krishna
Mainali, Samir Hazra, and Kamalesh Hatua under the supervision of
Dr. Bhattacharya.

z	IEEE PowEr ElEctronIcs MagazInE

11



Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - December 2014

IEEE Power Electronics Magazine - December 2014 - Cover1
IEEE Power Electronics Magazine - December 2014 - Cover2
IEEE Power Electronics Magazine - December 2014 - 1
IEEE Power Electronics Magazine - December 2014 - 2
IEEE Power Electronics Magazine - December 2014 - 3
IEEE Power Electronics Magazine - December 2014 - 4
IEEE Power Electronics Magazine - December 2014 - 5
IEEE Power Electronics Magazine - December 2014 - 6
IEEE Power Electronics Magazine - December 2014 - 7
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IEEE Power Electronics Magazine - December 2014 - 11
IEEE Power Electronics Magazine - December 2014 - 12
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IEEE Power Electronics Magazine - December 2014 - 48
IEEE Power Electronics Magazine - December 2014 - Cover3
IEEE Power Electronics Magazine - December 2014 - Cover4
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