Frt - Kaco blueplanet gridsave 92.0 TL3-S Manual

10 | Specifications
10.3

FRT

Dynamic grid support (Fault Ride Through)
A generation 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 lim-
its 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 (see figure below) 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. 63: Characteristic curve of the interference immunity against voltage drops based on the grid voltage
Immunity to over voltage
The immunity to over voltage is limited by two factors. The maximum voltage rating of the inverter hardware itself and
the actual battery status regarding battery DC voltage.
The maximum voltage rating is defined in the technical data of the inverter by the parameters "continuous operation
voltage range" and the "max operation voltage range (up to 100 s). 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 in-
crease beyond the short-term max. operating voltage range (up to 100 s).
Besides the maximum voltage rating, the immunity to voltage swells is also limited by the actual state of the connected
battery. If the grid voltage increases relative to the actual battery voltage, disconnection of the inverter might be neces-
sary to avoid uncontrolled current flow into the battery. The ration of the minimum DC battery voltage to AC grid voltage
preventing uncontrolled current flow is illustrated in [See figure 64 [} Page 77].
For VDE AR-N 4105:2018 and VDE AR-N 4110:2018 an immunity to over voltage up to 125 % U
pliant country settings (DE-NS2018 and DE-4110) U
Page 76
5
10
Capability curve
is configured to 662 V
DCmin
blueplanet gridsave 92.0 TL3-S blueplanet gridsave 110 TL3-S blueplanet gridsave 137
Manual
20
15
( Time [ s ] ; U [ p . u .])
.
DC
( 0 ; U )
min
( 3 0 ; 0 , 5 )
25 30
Time [ s ] [
is required. In the com-
nom
TL3-S