6-Pulse Series Connection: Controlled Converter + Uncontrolled Converter - Siemens SINAMICS DCM Operating Instructions Manual

Descriptions of functions
10.26 Connecting units in parallel and in series
10.26.4

6-pulse series connection: controlled converter + uncontrolled converter

Topology
The following diagram shows the topology of a 6-pulse series connection of a SINAMICS
DCM 2-quadrant unit and a diode rectifier (thyristor bridge B6 + diode rectifier).
Note
The AC input voltage of the controlled converter should be between 10% and 15% higher
than that of the uncontrolled converter, so that the current can be reliably reduced down to 0.
Figure 10-81 6-pulse series connection: controlled + uncontrolled rectifier
The instructions for dimensioning the balancing resistors can be found in an FAQ (for the
link, see the Preface).
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SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A