Reactive Current Control; Harmonics Controller - Siemens SINAMICS S120 Function Manual

Infeed
1.1 Active Infeed
1.1.7

Reactive current control

A reactive current setpoint can be set to compensate the reactive current or to stabilize the
line voltage in infeed mode. The total setpoint is the sum of the fixed setpoint p3610 and the
dynamic setpoint via the connector input p3611.
Note
The direction of rotation of the network is compensated automatically with reactive current
control. A negative reactive current setpoint causes an inductive reactive current; a positive
setpoint generates a capacitive reactive current.
Note
The closed-loop control limits the reactive current setpoint dynamically in such a way that the
sum of the active current setpoint and the reactive current setpoint does not exceed the
maximum device current.
Note
The reactive current consumption of the line filter selected in the configuration Wizard is
automatically covered by the Active Infeed closed-loop control. This means that the display
value of the current reactive current setpoint in r0075 no longer corresponds with the
parameterized total reactive current setpoint.
Note
The reactive power setpoint of the Line Module with respect to the network can be derived
by multiplying the parameterized total reactive current setpoint by 1.73 * rated line voltage.
1.1.8

Harmonics controller

Description
Harmonics in the line voltage cause harmonics in the line currents. Current harmonics can
be reduced by activating the harmonics controller.
Example: setting the harmonics controller
The 5th and 7th harmonics are to be compensated:
Table 1-4
Index
[0]
[1]
The phase currents in parameter p0069[0..2] (U, V, W) can be checked using the STARTER trace
function.
30
Example parameters for the harmonics controller
p3624 harmonics controller order
5
7
p3625 scaling
100 %
100 %
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions