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M. Makoschitz, M. Hartmann, J. Ertl:
"Effects of unbalanced mains voltage conditions on three-phase hybrid rectifiers employing third harmonic injection";
Vortrag: International Symposium on Smart Electric Distribution Systems and Technologies, Vienna; 08.09.2015 - 11.09.2015; in: "IEEE Conference Publications", (2015), S. 417 - 424.

Multitudinous industry applications require single-phase or
three-phase rectification circuits. Hybrid rectifiers offer fairly
flexible fields of applications (compared to purely implemented
passive or active rectifiers) due to their optional active converter
topology. The low harmonic input stage, however, is in general exposed
to unbalanced AC-side mains voltage conditions. Depending on location
and/or facility, input voltage variations can be 3% or higher
(short-term). Imbalance in mains input voltages on hybrid rectifiers
which are employing the third harmonic injection principle are
therefore analysed in detail. It is shown that unbalanced AC-side
input voltages not only directly influence THD of input currents and
power factor of the system, but also increase current stress of active
switches and passive components. Basic considerations are discussed
from a mathematical point of view and are finally confirmed by
simulation and experimental results of a 10 kW/10 kHz laboratory
prototype (passive three-phase diode bridge rectifier equipped with
`Flying' Converter Cell (FCC) active current injection cell).

http://dx.doi.org/10.1109/SEDST.2015.7315245

http://publik.tuwien.ac.at/files/PubDat_247358.pdf