SIEMENS
5
SINAMICS GM150 in IGCT Tandem version
01/28/2015
© Siemens AG 2015
12
SINAMICS GM150 SINAMICS SM150
Supplement for Catalog D 12 2012
5
SINAMICS GM150 in IGCT Tandem version
The SINAMICS GM150 series has been extended by two water-cooled types in
IGCT tandem version.
5.1
Overview
With the expansion of the power range of the SINAMICS GM150, drive
applications can be equipped with up to 23 MW for a motor voltage of 6.6 kV.
This is achieved using well-proven SINAMICS GM150 IGCT medium-voltage
drives, each with an output voltage of 3.3 kV with a phase offset of approx. 180°
feeding an open 6.6 kV motor winding system.
The drive system, comprising two three-level inverters, behaves like a five-level
converter and with 17 voltage levels connected to a motor winding generates
almost sinusoidal motor currents.
Figure 5-1
Block diagram tandem configuration
In the tandem configuration, two basic converter units feed a motor with an open
winding system, so that the two converters with nominal voltage 3.3 kV each result
in an insulation voltage of 6.6 kV. Hence the tandem version includes different
components than the converter units in a basic or parallel circuit. The motor wiring
cannot be changed in the tandem configuration.