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Abstract

A power converter circuit for converting a multi-phase alternating voltage into a high-voltage direct voltage and then into a second multi-phase alternating voltage. The circuit comprises first and second cascades of power converter cells, each cascade having first terminals on a transformer side and second terminals on a direct voltage side. The first cascade is a serial arrangement of first power converter cells, and the second cascade is a serial arrangement of second power converter cells. Each second power converter cell is embodied with a three-phase bridge circuit, connected by first terminals to a transformer, and with an intermediate circuit. A second current valve and, parallel to the three-phase bridge circuit, a first current valve, are disposed in at least one branch of the intermediate circuit. The first power converter cells are identical to the second power converter cells, or are embodied as a three-phase rectifier circuit.

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First Claim