6-Pulse Operation Of Sinamics G150 Parallel Converters - Siemens SINAMICS G130 Engineering Manual

5.9.1

6-pulse operation of SINAMICS G150 parallel converters

In 6-pulse operation, both rectifiers are connected to the same secondary winding of a two-winding transformer or to
a common infeed point, as illustrated in the following diagram.
6-pulse operation of SINAMICS G150 parallel converters
SINAMICS G150 parallel converters can operate satisfactorily in a 6-pulse circuit if the following supplementary
conditions are fulfilled:
·
The DC links are interconnected.
·
Motors with electrically isolated winding systems or with a common winding system can be connected.
Since no current compensation control is provided at the line side, the following measures must be taken to ensure
that the line-side currents are balanced:
·
Line reactors with a relative short-circuit voltage of v
reactors must not be omitted.
Exception: In parallel connections with integrated Line Harmonics Filter compact (option L01), the
filter performs the decoupling function which means that line reactors are omitted automatically.
·
Symmetrical power cables must be installed between the infeed point and the two rectifiers (cables
of the same type with identical cross-section and length).
The supplementary conditions to be fulfilled on the motor side are described on the page after next in section
"Operation of motors with electrically isolated and with common winding systems".
Engineering Information
= 2 % (option L23) must be provided. The line
k
SINAMICS Engineering Manual – November 2015
SINAMICS G150
327/528
Ó Siemens AG