Q(U) 10 nodes
When it comes to Q(U) 10 nodes, the nominal value of the reactive power is continuously calculated depending on the
grid voltage. This function ensures that grid support is provided by the reactive power as soon as the voltage actually de-
viates from the target voltage. In this case, a characteristic curve is specified which can be used to configure up to 10
nodes, value pairs for voltage and reactive power. Other parameters allow you to limit functionality and to limit activation
to certain voltage ranges as well as parametrise the transient response.
The zero sequence voltage is used to calculate the reactive power target for three-phase units.
230
207
0
Q [%PN]
U[V]
Q(U) standard characteristic
0
20
40
40
20
60
253
60
1) 43,6 | 207
2) 0 | 212
3) 0 | 230
4) 0 | 248
5) 43,6 | 253
Fig. 46:
Q(U) standard characteristic curve with 5 nodes
Timeout
[
VArPct_RvrtTms]
0 – 1000 [s]
Specifies the timeout time after which the in-
verter sets the reactive power value in the
event of a communication timeout.
If the timeout is set to 0 seconds, this is suitable
for lasting preservation.
10.1.4
Parameters for reactive power control
Country-
spec. Set-
tings
Men
u
level
Display/
Setting
Action in this menu/meaning
cos-phi const.
1 – 0.3
Specified displacement factor
Over-excited | under-
excited
Reactive power mode Under-excited relates to inductive load, over-ex-
cited relates to capacitive load.
Q constant
0 – 100 [% S
max
]
Specification as a % of the maximum power
Under-excited | over-
excited
Reactive power mode Under-excited relates to inductive load, over-ex-
cited relates to capacitive load.
cos-phi(P/Plim)
Settling time
200 – 30000 [ms]
Determines the dynamic behaviour in the event of a change in the cos ϕ
set value. With a change of the active power or the lock-in and lock out
voltage, the cos ϕ is changed according to a PT-1 characteristic curve
with a settling time of 5 Tau.
Lock-in voltage
23V – 287V
The control is activated above this voltage.
Lock-out voltage
23V – 287V
The control is deactivated below this voltage.
Number of nodes
2 – 10
Specify the number of nodes for the cos ϕ/(p/pn) characteristic curve
Powador 30.0-72.0 TL3
Page 57
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