Frt - Kaco blueplanet 87.0 TL3 M1 WM OD IIF0 Manual

Manual
10.3

FRT

Dynamic grid support (Fault Ride Through)
A generator plant's ability to remain immune to voltage drops and voltage spikes in the supply system is a key
element in establishing a reliable energy supply. Immunity to interference ensures that brief disruptions do not
result in a loss of generation capacity in a larger range of an interconnected grid. Grid support by a fast feeding
of residual current also limits the spatial extent of the incident.
With its dynamic grid support by way of immunity, the device has this characteristic. The ability to remain on
the grid is particularly relevant. The protective settings also determine the device's ability to remain on the grid
or not. Protective settings take the upper hand over the capacity of immunity to interference.
10.3.1 Dynamic grid support by way of immunity to interference
Interference immunity against undervoltage
Voltage drop above the limit curve in can be overcome without the need for shutdown from the grid. The feed-
in power remains constantly within the limits of the maximum continuous current of the inverter.
If a reduction in power occurs, the power is brought back up to the pre-fault level within 100 ms of the voltage
returning.
U [ p . u .]
1 , 2
0 ; 1 )
1
, 8
0 , 6
(3 ; 0,5)
( 3 ; 0 , 5 )
0 , 4
0 , 2
(1 ; 0,1)
( 1 ; 0 , 1 )
(1 ; 0)
( 1 ; 0 )
0
0
Fig. 92: 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 volt-
age. The support takes place in the event of voltage drop in the form of over-excited reactive current (corre-
sponds to a capacitive load), in the event of voltage spike in the form of over-excited reactive current (corre-
sponds to an inductive load). In the reactive current priority mode, the effective current is reduced to the ex-
tent necessary to comply with the limits of the maximum continuous current of the inverter.
KACO blueplanet 110 TL3 KACO blueplanet 125 TL3 US
5
10
Capability curve
Specifications | 10
20
15
( Time [ s ] ; U [ p . u .])
( 0 ; U )
min
( 3 0 ; 0 , 5 )
25 30
Time [ s ] [
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