Information On Line-Side Harmonics Produced By Converter Units In A Fully- Controlled Two-Pulse Bridge Circuit Configuration (B6C And (B6)A(B6)C) - Siemens SINAMICS DCM Operating Instructions Manual

Connecting
6.1 Instructions for EMC-compliant drive installation
Radio interference suppression filters generate leakage currents. In accordance with
EN 61800-5-1, a PE connection with a cross-section of 10 mm
have maximum effect, it is absolutely essential that they and the device are installed on a
single metal plate.
In the case of converters with a 3-phase connection, the minimum rated current of the filter is
the same as the device's input current or output DC current, as specified on the device rating
plate (see Armature Input and Armature Output respectively), times 0.82.
In the case of a two-phase connection (field supply), only two phases are connected to the
three-phase radio interference suppression filter. In this case, the minimum rated current of
the filter is the same as the input current (see Field input) or field DC current specified on the
device rating plate.
6.1.5 Information on line-side harmonics produced by converter units in a fully-
controlled two-pulse bridge circuit configuration (B6C and (B6)A(B6)C)
The majority of converter units for medium-power applications have a fully-controlled three-
phase bridge circuit. Below is an example of the harmonics that can be found in a typical
system configuration for two firing angles (α = 20° and α = 60°).
The values have been taken from a previous publication, "Oberschwingungen im
netzseitigen Strom sechspulsiger netzgeführter Stromrichter (Harmonics in the Line-Side
Current of Six-Pulse, Line-Commutated Converters)" by H. Arremann and G. Möltgen,
Siemens Research and Development Division, Volume 7 (1978) No. 2, © Springer-Verlag
1978.
In addition, the formulas are specified which, depending on the actual operating data in use
[line voltage (no-load voltage U
calculate the short-circuit power S
specified harmonics spectrum applies. If the actual line short-circuit power and/or actual
armature inductance deviate from the values calculated in this way, then they will need to be
calculated on a case-by-case basis.
The harmonics spectrum listed below is produced if the values for the short-circuit power S
at the connection point of the device and the armature inductance L
using the formulas below, match the actual system values. If the values do not match, the
harmonics will have to be calculated separately.
a) α = 20°
Fundamental factor g = 0.962
ν
5
7
11
13
17
19
23
25
66
I / I ν I / I
ν 1 ν
0.235 29 0.018
0.100 31 0.016
0.083 35 0.011
0.056 37 0.010
0.046 41 0.006
0.035 43 0.006
0.028 47 0.003
0.024 49 0.003
), line frequency f , and DC current I
v0 N
and armature inductance L
K
b) α = 60°
Fundamental factor g = 0.953
ν I
1 ν
5 0.283
7 0.050
11 0.089
13 0.038
17 0.050
19 0.029
23 0.034
25 0.023
is required. For the filters to
2
], can be used to
d
for the motor for which the
a
of the motor, calculated
a
/ I ν I / I
1 ν
29 0.026
31 0.019
35 0.020
37 0.016
41 0.016
43 0.013
47 0.013
49 0.011
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A
K
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