Efficient Networks S120 manual Reactive current control, Harmonics controller

Infeed

1.1 Active Infeed

1.1.7Reactive 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.

1.1.8Harmonics 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	Example parameters for the harmonics controller
Index	p3624 harmonics controller order	p3625 scaling
[0]	5	100 %
[1]	7	100 %
The phase currents in parameter p0069[0..2] (U, V, W) can be checked using the STARTER trace
function.

30	Drive Functions
	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4