10
Specifications
10.1
Reactive power control
Reactive power can be used in electrical energy supply networks to bolster the level of voltage. As such, feed-in inverters
can contribute to statistical voltage stability. Reactive power brings about a voltage drop at the inductive and capacitive
components of the equipment which can either bolster or reduce the level of voltage. If the generating plant draws in-
ductive reactive power while active power is being fed in, part of the voltage swing caused by the active power feed can
be compensated for by the supply of reactive power.
This reactive power mode and the respective control process are specified by the grid operator. If no control process has
been specified, then the system should be operated using a reactive power specification of 0%.
10.1.1
Operating power range depending on grid voltage
The device can be operated within the respective fixed voltage range provided. The maximum apparent power is stated in
the following table. In the event of undervoltage determined by the maximum continuous current subject to the grid
voltage.
The following figures show the reactive power-active power operating range for devices with a nominal voltage of U
N
220/380, 230/400, 240/415.
Voltage - devices with U
N:
220 V / 380 V; 230 V / 400 V; 240
V / 415 V
Maximum apparent power [p.u.]
≥ 395
1.04
380
1.0
360
0.95
Tab. 6:
Maximum continuous apparent power depending on grid voltage
Fig. 28:
P-Q operating range for storage devices with U
N
220/380 V, 230/400 V, 240/415 V (Qmax=Smax)
Fig. 29:
Grid voltage-dependent apparent power for storage
devices with U
N
220/380, 230/400, 240/415 V
10.1.2
Dynamics and accuracy
In all control methods the specified target value at the inverter’s connection terminals is adjusted using a stationary devi-
ation of the reactive power of maximum 2% S
N
. This maximum deviation always relates to the specified value as reactive
power. If the shift factor cos ϕ is specified in the control method, then the deviation relates to the reactive power value
brought about by the current power level.
The transient response of the control methods is determined by a PT-1 filter. In this case, the settling time corresponds to
5 Tau, or in other words, achieving approx. 99% of the final value for a PT-1 filter. Subject to the control method selected,
there are also other parameters that determine dynamic behaviour.
KACO blueplanet gridsave 50.0TL3-S
Page 51
EN
