It the specification is changed (e.g. as a result of activating or deactivating the function by way of lock-in and lock-out volt-
age or changing the active power), then the new value is adopted by way of a filter and a gradient limit in a muted man-
ner. The settling time and gradient limit are adjustable.
Q(U)
When it comes to Q(U), the reactive power value is calculated continuously as a function of the grid voltage. This function
ensures that grid support is provided by the reactive power as soon as the voltage actually deviates from the target volt-
age.
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. 73:
Q(U) standard characteristic curve with 5 nodes
In this case, a characteristic curve [See figure 73] [
Page 73] 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 cer-
tain voltage ranges as well as parametrize the transient response.
The positive phase sequence voltage is used to calculate the reactive power target value for three-phase units.
A closed-loop control circuit is established for the device from Q(U). The amplification of this control circuit changes sub-
ject to the effective grid impedance. A very significant amplification of this control circuit may result in an oscillation ten-
dency. The plant operator is responsible for using suitable settings for Q(U) control in consultation with the grid operator.
Sections of the curve with a gradient of more than 24%Smax/1%Unom should be avoided or should only be applied to
grids with a large Skv/SA ratio (Skv mains short-circuit power, SA plant power).
10.2.3 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 | un-
der-excited
Reactive power operating type, under-excited corresponds to inductive
load, over-excited corresponds to capacitive load.
Q constant
0-100 [% S
max
]
Specification as a % of the maximum power.
Under-excited |
over-excited
Reactive power operating type, under-excited corresponds to inductive
load, over-excited corresponds to capacitive load
cos-phi(P/Plim)
Settling time
200 – 30000 [ms]
Specifies the dynamic behavior at change of cos φ set point. On an ac-
tive power change, or at lock in or lock out, the cos φ is changed accord-
ing at PT-1 characteristic with a settling time equal t o5 Tau.
Lock-in voltage
23V – 287V
Control is activated above this voltage.
Lock-out voltage
23V – 287V
Control is deactivated below this voltage.
KACO blueplanet 87.0 TL3 KACO blueplanet 92.0 TL3 KACO blueplanet 110 TL3 KACO blueplanet 125 TL3
KACO blueplanet 137 TL3 KACO blueplanet 150 TL3
Page 73
EN-US
