Abb Schweiz Ag

Erich Suter

Christian Stulz

Pieder Jörg

Pieder Joerg

Thomas Berner

Christoph Eichler

Adrian Zuckerberger

A polyphase converter circuit having p&#x2267;3 phases (R, Y, B) and a converter circuit element provided for each phase (R, Y, B) is specified, each converter circuit element having a rectifier unit, a DC voltage circuit which is connected to the rectifier unit and an inverter unit which is connected to the DC voltage circuit. In addition, a first AC voltage output of each inverter unit forms a phase connection, and second AC voltage outputs of the inverter units are star-connected. In order to produce harmonics which are as low as possible with respect to the fundamental of the voltage and the current of an electrical AC voltage system which is connected on the input side to the converter circuit, n transformers are provided, each having a primary winding and m three-phase secondary windings, where n&#x2267;2 and m&#x2267;3. Furthermore, p sets of secondary windings are provided, each set of secondary windings being formed by in each case three-phase secondary windings of each transformer, and each set of secondary windings with the associated secondary windings being connected to the rectifier unit of a respective converter circuit element.

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Baden, Switzerland

Erich Suter