J.W. Kolar, U. Drofenik, H. Ertl, F. Zach:
"VIENNA Rectifier III - A Novel Three-Phase Single-Stage Buck-Derived Unity Power Factor AC-to-DC Converter System";
Talk: IEEE Nordic Workshop on Power and Indusrial Electronics, Helsinki Technical University; 08-01-1998; in: "Proceedings of the IEEE Nordic Workshop on Power and Industrial Electronics,", (1998), 1.

In the area of AC/DC converters with low effects on the mains single-stage rectifier systems gain more and more importance. The basic characteristic of these systems is the direct integration of a high-frequency isolation of the output circuit into the converter topology. This makes possible the matching of the output and mains voltage levels besides the sinusoidal guidance of the mains currents and a highly dynamic control of the output voltage. Also, higher efficiency and a lower realization effort as compared to a two-stage, i.e., AC/DC-DC/DC engergy conversion results. In this paper the topology of a novel single-stage three-phase PWM rectifier system with impressed output current is developed starting from a two-stage converter concept. After the description of the basic function of the circuit (called VIENNA Rectifier III) the conduction states and the current space vectors available for forming the input currents are determined; a simple three-loop control of the converter is proposed which also guarantees a symmetric transformer magnetization based on pre-control signals. Furthermore, the theoretical considerations are verified by digital simulation and the current stresses on the power semiconductor devices are calculated in analytically closed form. Finally, a short preview on the planned continuation of the research is given.