Fronius GEN24 Operating Instructions Manual page 42

Charge power limitation when "Activation Threshold Undervoltage" is exceeded.
Frequency-dependent Power Control
, also called frequency/watt function or P(f) function, causes a change in effect-
ive power depending on the grid frequency.
A distinction is made between:
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When the function is activated and the specified grid frequency limit value is ex-
ceeded, the effective power
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The gradients result depending on the parameter "Configuration Method":
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In the case of an inverter with storage and active grid support activated, addi-
tional scenarios arise:
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SOC (State Of Charge) limits can be set for active grid support with battery.
These can be found under "Battery SoC Limitation for Grid Support":
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Overfrequency
Underfrequency
is reduced according to a defined gradient in the event of an overfrequency
(in the case of an inverter with storage, discharge of the storage is stopped
first before the power of the PV generator is reduced).
is increased in the event of underfrequency in accordance with a defined
gradient (in the case of an inverter without storage or with active grid sup-
port deactivated, only possible in conjunction with a manual power reduction
and corresponding priority).
"Gradient": The gradient is given in %/Hz in relation to the device nominal
power or the momentary power when entering the function (see example 1).
"Stop Frequency": With this method, the gradient always results from the
current power at entry to the function to the stop frequency set in the setup
and power at stop frequency (see example 2).
If the output power has already been reduced to 0 W at overfrequency and
the frequency continues to rise, additional energy can be drawn from the grid
(the battery is thus charged).
If the charging power (drawn from the grid) is reduced to 0 W at underfre-
quency and the frequency continues to drop, additional energy can be drawn
from the battery to increase the output power.
"Battery SoC Lower Limit" - The battery will not be further discharged when
the lower limit is reached.
"Battery SoC Upper Limit" - The battery will not be further charged when
the upper limit is reached.