Connecting Units In Parallel And In Series - Siemens SINAMICS DCM Operating Instructions Manual

Descriptions of functions

10.25 Connecting units in parallel and in series

10.25 Connecting units in parallel and in series
Topology overview
Several SINAMICS DCM converters can be arranged in various topologies. The following
topologies are supported:
● 6-pulse parallel connection
● 12-pulse parallel connection
● 6-pulse series connection
● 12-pulse series connection
NOTICE
 All of the topologies listed here are only permissible in the restricted line frequency
 For all of the topologies listed here, only units with the same rated DC current rating
Note
More information about design is given in the associated application notes (see link in
preface).
450
This topology is used in order to realize converter power ratings that are above the
highest available SINAMICS DCM rating.
This topology is especially used at higher power ratings to achieve lower line harmonics.
In addition, by using this circuit, a lower DC current ripple is obtained when compared to
a 6-pulse connection. One or several 6-pulse converters can be connected in parallel to
each of the two 12-pulse converters connected in parallel.
This topology is used to achieve a higher no-load DC voltage.
The following versions are available:
– Both converters are operated with the same firing angle.
– Sequence control (one of the two converters is always at a control limit, the other
converter controls the armature current)
– Series connection of a controlled converter with an uncontrolled converter (thyristor
bridge B2 + diode rectifier)
One or several converters can be connected in parallel to each of the converters
connected in series to increase the power rating.
The topology corresponds to a 6-pulse series connection. In addition, a lower DC current
ripple is obtained when compared to a 6-pulse connection. One or several converters can
be connected in parallel to each of the converters connected in series to increase the
power rating.
range from 20 Hz to 65 Hz.
may be used.
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
SINAMICS DCM DC Converter