15
10
U [
p
.
u
.]
Time [
s
]
Capability curve
0
,
6
0
,
4
0
,
2
0
1
,
8
1
,
2
20
0
;
1
)
(
1 ;
0
)
(
3 ;
0
,
5
)
5
25
[
30
(
1 ;
0
,
1
)
(
Time [
s
] ; U [
p
.
u
.])
(
3
0
;
0
,
5
)
(
0
;
U
min
)
0
(1 ; 0)
(1 ; 0,1)
(3 ; 0,5)
Fig. 96: Immunity to interference characteristic curve relative to the nominal voltage (p.u.) of the blueplanet 125.0TL3
The inverters can ride through voltage swells provided the voltage level does not remain above the continuous operation
voltage range for longer than 100 s and does not increase beyond the short-term max. operating voltage range (up to
100s). The values specific to each inverter can be found here.
The interface protection (voltage,frequencey, ant-islanding) integrated in the inverter is configurable in a range allowing
the behaviour above. However, if the interface protection setting is limiting the voltage time characteristic, the interface
protection will trip and interrupt the ride through as configured.
10.3.2
Dynamic grid support using a fast feeding of residual current
When dynamic grid support using a fast feeding of residual current is activated, then residual current is fed in in addition
to the immunity to interference properties against drops and spikes described above.
The inverter adapts its current feed as soon as a drop or spike incident occurs in order to bolster the grid voltage. The
support takes place in the event of voltage drop in the form of over-excited reactive current (corresponds to a capacitive
load), in the event of voltage spike in the form of over-excited reactive current (corresponds to an inductive load). In the
reactive current priority mode, the effective current is reduced to the extent necessary to comply with the limits of the
maximum continuous current of the inverter.
A dip or swell is detected if either the normal operating voltage range setting is exceeded by at least one phase-phase or
phase-neutral voltage, or if a step in the positive or negative sequence component of the voltage greater than the dead-
band setting occurs. The magnitude of the voltage step of the positive and negative sequence voltage equates to the dif-
ference between the pre-fault voltage and the actual voltage based on the reference voltage. The pre-fault voltage is cal-
culated as a 50-periods mean value.
Fig. 97:
Formula n° 1
The reactive current is adapted using a response time of <20 ms and a transient time of <60 ms after the incident has oc-
curred. Responses to changes in the voltage during the incident or to the voltage recovery at the end of the incident take
place with the same dynamic.
The formula for calculating the dynamic reactive current that is fed for the positive or negative phase sequence voltage is:
Fig. 98:
Formula n° 2, depending from the nominal current IN of the inverter
For the positive and negative phase sequence voltage,
Δu
equates to the difference between the pre-fault voltage and the
current voltage based on the reference voltage. The pre-fault voltage is calculated as a 1-min mean value.
Fig. 99:
Formula n° 3
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 85
EN-US
