M. Makoschitz, J. Ertl:
"Analysis of a three-phase flying converter cell rectifier operating in light/no-load condition";
Talk: Annual IEEE Applied Power Electronics Conference and Exposition, Charlotte, NC; 03-15-2015 - 03-19-2015.

Abstract-The "Flying" Converter Cell (FCC) rectifier allows
the extension of an existing passive diode bridge rectifier to a lowharmonic
unity power factor input stage by adding a combination
of additional converter topologies to the DC-side of the passive
circuit. In general, light-load condition of such an active rectifier,
however, may lead to undesired effects as, e.g., impaired total
harmonic distortion of input currents (THDi). In this paper the
operation of the active rectifier circuit under no-load or light-load
conditions and corresponding effects are therefore analyzed in detail
also considering the control of the two FCC DC voltages. Three
different operating modes are proposed and different parameters
and characteristics of these modes are discussed accompanied by
simulation results. It is shown that the inductance value of the
coupled three-phase current injection choke directly influences the
operating behavior and design guidelines for this coupled inductor
are therefore derived. This work further comprises a closer look at
current control and voltage balancing of FCC DC voltages during
light- and no-load condition and resulting optimization issues
evoked due to appropriate control of dedicate control structures.
Discussed side effects are finally verified by experimental results
taken from a laboratory prototype of 10 kW output power and
10 kHz switching frequency

http://dx.doi.org/10.1109/APEC.2015.7104337

http://publik.tuwien.ac.at/files/PubDat_247305.pdf