Siemens SINAMICS DCM Manual page 566

Extended topology
The topology of a 6-pulse parallel connection, comprising a master converter, one substitute
master, two slave converters, as well as an independent converter is shown in the following
diagram.
The converters SINAMICS DCM 1, DCM 2, DCM 3 and DCM 4 are operated in the n+m
operating mode. The SINAMICS DCM 5 converter is, regarding its power unit, independent
of the others. It only exchanges BICOs with them via the parallel interface.
Figure 10-79 6-pulse parallel connection, extended topology
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
10.27 Connecting units in parallel and in series
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Descriptions of functions
567