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
6.1.4 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 two-
pulse bridge circuit configuration. 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 example specifies formulae 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 unit terminal and the armature inductance L
formulae below, match the actual values found in the system. If the values do not match, a
separate calculation procedure will need to be carried out for the harmonics.
a) α = 20°
Fundamental factor g = 0.962
ν
5
7
11
13
17
19
23
25
The fundamental component of current I
following formula:
I = g × 0.817 × I
1
where I
and where g is the fundamental factor (see above)
The harmonics currents calculated on the basis of the tables above only apply to
I.) Short-circuit power SK at the converter unit terminal
S = U
K
where
X
N
and
64
I /I ν
ν 1
0.235 29
0.100 31
0.083 35
0.056 37
0.046 41
0.035 43
0.028 47
0.024 49
d
is the DC current of the operating point under investigation
d
/X (VA)
2 v0
N
= X - X = 0.03526 × U
K D
), line frequency f
v0
and armature inductance L
K
b) α = 60°
Fundamental factor g = 0.953
I /I ν
ν 1
0.018 5
0.016 7
0.011 11
0.010 13
0.006 17
0.006 19
0.003 23
0.003 25
as a reference variable is calculated using the
1
/ I - 2πf × L (Ω)
v0 d N D
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619
, and DC current I
N
for the motor to which the
a
of the motor, calculated using the
a
I /I ν
ν 1
0.283 29
0.050 31
0.089 35
0.038 37
0.050 41
0.029 43
0.034 47
0.023 49
SINAMICS DCM Control Module
], can be used to
d
K
I /I
ν 1
0.026
0.019
0.020
0.016
0.016
0.013
0.013
0.011