Country-
spec. Set-
tings
Men
u
level
Display/
Setting
Action in this menu/meaning
P(f) intentional delay
0 – 5,000 [ms] / 0
[ms] 1
The activation of the function based on the activation threshold is de-
layed by the configured time.
Note 1: This function is considered to be critical for the stability of the
transmission grid and is therefore forbidden by many domestic grid con-
nection directives.
Note 2: This function is stipulated as a requirement by some domestic
grid connection directives in order to prevent any negative impact on is-
land detection. However, P(f) has no negative impact on KACO's en-
hanced island detection.
4
1
2
3
4
Output gradient limita-
tion increase & Output
gradient limitation de-
crease
0 – 65,534 [%/Min] /
65,534 [%/min] /
1
Specifies the dynamic response on changing the active power for power
increase and decrease. With a voltage change, the active power is
changed with the specified gradient.
Note:
The gradient is overlaid with the settling time.
P(f) deactivation gradi-
ent
1 – 65,534 [% S
lim
/
min] / 10 [% S
lim
/
min] / 1
If the available power is above the actual output at the time of deactiva-
tion, the power increase back to the maximum power is limited. The
limitation is implemented by an absolute power limitation that in-
creases with a continuous gradient up to the maximum power. The ac-
tual power of the inverter may vary freely below this limit due to a pos-
sible fluctuation in the available power or the target value, but at no
time increases above the absolute power limit.
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.
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.
10 | Specifications
Manual
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Page 76
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