Vienna rectifier

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A Vienna rectifier , also known as a three-phase three-point pulse rectifier , is a rectifier circuit used in electrical power engineering to convert three-phase alternating current into direct current . It belongs to the group of controlled rectifiers and was developed in 1993 by Johann W. Kolar at the Vienna University of Technology .

General

Circuit of a three-phase, three-point pulse rectifier
Module of a Vienna rectifier for 400 V and an output of 10 kW

In contrast to the conventional six-pulse bridge circuit (B6) used for three-phase current, the Vienna rectifier is characterized by a significantly lower proportion of harmonics on the AC voltage side and, if you want, delivers a DC voltage that is twice as high. Due to the almost sinusoidal current curve, a smaller line filter and thus a smaller volume for the rectifier is necessary , especially for higher outputs . The disadvantage is the complex and necessary electronic control circuit, which controls the rectifier by means of pulse width modulation (PWM).

The PWM control of the rectifier, which typically uses IGBTs , allows the DC output voltage to be controlled in certain ranges. A form of space vector modulation is used here. With this rectifier, the power flow is only possible from the three-phase current side to the direct current side.

Applications are in the area of ​​compact replacement of the six-pulse bridge circuit and where otherwise voluminous line filters are necessary to achieve an almost sinusoidal current curve on the three-phase current side. This includes, for example:

Individual evidence

  1. ↑ JW Kolar, “Dreiphasen-Dreippunkt-Pulsgleichrichter”, December 23, 1993, No .: A2612 / 93, European patent: EP 94 120 245.9-1242, “Device and method for converting three-phase current into direct current”.
  2. ^ JW Kolar, H. Ertl, FC Zach: Design and Experimental Investigation of a Three-Phase High Power Density High Efficiency Unity Power Factor PWM (Vienna) Rectifier Employing a Novel Integrated Power Semiconductor Module , in Proceedings of the 11th IEEE Applied Power Electronics Conference , San Jose (CA), USA, March 3-7 , 1996, Issue 2, pages 514 to 523 doi : 10.1109 / APEC.1996.500491 .

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