Harmonics Controller - Siemens SINAMICS S120 Function Manual

Infeed
2.1 Active Infeed
2.1.7

Harmonics controller

Harmonics in the line voltage cause harmonics in the line currents.
With the activation of the harmonics controller, the ALM generates a pulse pattern that
contains harmonic components in addition to the fundamental component. Ideally, the Active
Infeed now sets an equally large harmonic voltage to the harmonic voltage on the line side,
and does not consume any power for this harmonic. Despite the harmonic component of the
line voltage, the line current remains almost sinusoidal and does not load the line supply with
additional harmonic currents. However, the specific compensation of voltage harmonics to
improve the line supply quality is not possible.
Example: Setting the harmonics controller
The 5th and 7th harmonics are to be compensated:
Table 2- 4
Index
[0]
[1]
The phase currents in parameter p0069[0...2] (U, V, W) can be checked using the STARTER trace
function.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• p3624[0...1]
• p3625[0...1]
• r3626[0...1]
• r0069[0...6]
36
Example parameters for the harmonics controller
p3624
5
7
Infeed harmonics controller order
Infeed harmonics controller scaling
Infeed harmonics controller output
Phase current actual value
p3625
100 %
100 %
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions