Siemens SINAMICS DCM Manual page 108

6.1.6 Data on the line-side harmonics from converter units in a fully-controlled AC
bridge circuit B2C
Converter units for lower power ratings can be connected and parameterized as fully-
controlled AC bridge circuit.
Below is an example for the current harmonics of a typical system configuration of a field
excitation controller (this is a system with a large DC circuit inductance). The case with the
highest harmonic load of the line supply has been selected here.
For every motor used, a separate investigation must be performed to determine the actual
harmonic load. In any case, the result will be less than in the example shown.
For comparison purposes, the table also includes the harmonic load of a B6C three-phase
bridge at the same operating point as the field excitation controller.
Harmonic order
Fundamental content
1)
converter circuit
2)
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
B2C
2)
v Iv / I
1 90.1 %
1)
3 30.0 %
5 18.0 %
7 12.9 %
9 10.0 %
11 8.2 %
13 6.9 %
15 6.0 %
17 5.3 %
19 4.7 %
21 4.3 %
23 3.9 %
25 3.6 %
ac.maher.co.ir
6.1 Instructions for EMC-compliant drive installation
B6C Harmonic order
2)
Iv / I v
95.6 % 27
29
19.1 % 31
13.7 % 33
35
8.7 % 37
7.4 % 39
41
5.6 % 43
5.0 % 45
47
4.2 % 49
3.8 %
Connecting
B2C B6C
2) 2)
Iv / I Iv / I
3.3 %
3.1 % 3.3 %
2.9 % 3.1 %
2.7 %
2.6 % 2.7 %
2.4 % 2.6 %
2.3 %
2.2 % 2.3 %
2.1 % 2.2 %
2.0 %
1.9 % 2.0 %
1.8 % 2.0 %
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