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J.W. Kolar, F. Schafmeister, S. Round, H. Ertl:
"Novel Three-Phase AC-AC Sparse Matrix Converters";
IEEE Transactions on Power Electronics, 22 (2007), 5; 1649 - 1661.

A novel three-phase ac-ac sparse matrix converter
having no energy storage elements and employing only 15 IGBTs,
as opposed to 18 IGBTs of a functionally equivalent conventional
ac-ac matrix converter, is proposed. It is shown that the realization
effort could be further reduced to only nine IGBTs in an
ultra sparse matrix converter (USMC) in the case where only
unidirectional power flow is required and the fundamental phase
displacement at the input and at the output is limited to 6.
The dependency of the voltage and current transfer ratios of the
sparse matrix converters on the operating parameters is analyzed
and a space vector modulation scheme is described in combination
with a zero current commutation method. Finally, the sparse matrix
concept is verified by simulation and experimentally using a
6.8-kW/400-V very sparse matrix converter, which is implemented
with 12 IGBT switches, and USMC prototypes.
Index Terms-Ac-ac converter, matrix converter, reduced switch
count converter, sparse matrix.

http://dx.doi.org/10.1109/tpel.2007.904178