M. Makoschitz, M. Hartmann, J. Ertl:
"Topology Survey of DC-Side-Enhanced Passive Rectifier Circuits for Low-Harmonic Input Currents and Improved Power Factor";
Talk: PCIM Europe 2015, Nürnberg (invited); 05-19-2015 - 05-20-2015.

Passive diode bridge (B6) rectifiers are widely used in
industry for three-phase AC-to-DC conversion due to simplicity of
circuit and design, high efficiency as well as robustness and low
cost. For applications which require high input current quality (low
THDi and high power factor) active three-phase rectifiers have to be
used which in general are dedicated systems fully replacing the
passive rectifier stage. For specific applications (e.g., AC drives)
now a concept is attractive which opens the opportunity that an
existing B6 rectifier optionally can be upgraded to high quality mains
currents if required. This paper provides a concise topology survey
and proposes several new circuits regarding such DC-side located
add-on options for standard B6 rectifiers. All proposed topologies
(introduced and also new circuits) are based on the third harmonic
injection principle. The most attractive concepts are analyzed in
detail concerning injection inductor design, DC- link capacitor design
and voltage/current stress of the required switching semiconductor
devices. Measurements of a laboratory prototype finally illustrate
good stationary and dynamic performance of the implemented system.

http://publik.tuwien.ac.at/files/PubDat_247319.pdf