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M. Baumann, J.W. Kolar:
"A Novel Control Concept for Reliable Operation of a Three-Phase Three-Switch Buck-Type Unity-Power-Factor Rectifier With Integrated Boost Output Stage Under Heavily Unbalanced Mains Condition";
IEEE Transactions on Industrial Electronics, Volume 52 (2005), 2; 399 - 409.

In this paper the reliable operation of a three-phase
three-switch buck-type pulsewidth-modulation unity-powerfactor
rectifier with integrated boost output stage under heavily
unbalanced mains, i.e., mains voltage unbalance, loss of one
phase, short circuit of two phases, or earth fault of one phase is
investigated theoretically and experimentally. A brief description
of the principle of operation and the most advantageous modulation
method are given. The analytical calculation of the relative
on-times of the active switching states and of the dc-link current
reference value is treated in detail for active and deactivated
boost output stage. Based on the theoretical considerations a
control scheme which allows for controlling the system for any
mains condition without changeover of the control structure is described.
Furthermore, digital simulations as well as experimental
results are shown which confirm the proposed control concept
for different mains failure conditions and for the transition from
balanced mains to a failure condition and vice versa. The experimental
results are derived from a 5-kW prototype (input voltage
range (280. . .480) Vrms line-to-line, output voltage 400 VDC) of
the rectifier system, where the control is realized by a 32-bit digital signal processor.
Index Terms-Control concept, mains voltage unbalance, powerfactor
correction, three-phase rectifier, two-phase operation.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05935320