Abstract—Direct AC/AC topologies for AC-to-AC power
conversion benefit from the absence of DC-link capacitors and
therefore high reliability as compared to traditional VSI-based
topologies. Moreover, it is shown in this paper that the direct
AC/AC converters also promise to provide higher efficiency
than their voltage source inverter (VSI) based back-to-back
(BTB) counterparts due to a dramatic reduction in switching
losses. These factors allow the direct AC/AC converter to
switch faster, and maintain much smaller size and lower cost
relative to their competition. This paper compares the
performance of three different device types (SiC, hybrid Si/SiC
and Si) for use in a direct AC/AC converter. It is conjectured
that traditional datasheets lack the level of detail needed for
designing highly efficient direct AC/AC converters. Therefore,
comprehensive loss models for all the devices are formed
through a rigorous device characterization under varying (V, I,
T) operating conditions. Finally, a loss comparison is
performed to identify the most suitable device (among those
characterized) for a specific 13 kV / 1 MW highly efficient
direct AC/AC power flow controller.
Abstract—Direct AC/AC topologies for AC-to-AC power
conversion benefit from the absence of DC-link capacitors and
therefore high reliability as compared to traditional VSI-based
topologies. Moreover, it is shown in this paper that the direct
AC/AC converters also promise to provide higher efficiency
than their voltage source inverter (VSI) based back-to-back
(BTB) counterparts due to a dramatic reduction in switching
losses. These factors allow the direct AC/AC converter to
switch faster, and maintain much smaller size and lower cost
relative to their competition. This paper compares the
performance of three different device types (SiC, hybrid Si/SiC
and Si) for use in a direct AC/AC converter. It is conjectured
that traditional datasheets lack the level of detail needed for
designing highly efficient direct AC/AC converters. Therefore,
comprehensive loss models for all the devices are formed
through a rigorous device characterization under varying (V, I,
T) operating conditions. Finally, a loss comparison is
performed to identify the most suitable device (among those
characterized) for a specific 13 kV / 1 MW highly efficient
direct AC/AC power flow controller.
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