Fronius GEN24 - Page 50

Power curve at overfrequency with hysteresis.
Underfrequency
Parameter Range of val-
ues
Description Availability
"Calculation
Mode Underfre-
quency"
P
max
=
P
m
-P
m
(k*df)
Indicates the reference
power for calculating the
power limit in the event of
underfrequency.
Reference power
-
P
m
→ Momentary
power when the fre-
quency limit value is
exceeded.
-
P
n
→ Nominal power
of the device.
P
max
=
P
n
-P
n
(k*df)
P
max
=
P
m
-P
n
(k*df)
"Activation
Threshold Un-
derfrequency"
45 ‑ 66 [Hz] Frequency limit value
above which the power in-
crease takes place.
"Gradient Un-
derfrequency"
0 ‑ 100 [%/Hz] Gradient by which the ef-
fective power increases.
Example - conversion from
static to gradient:
Static s = 5 % → Gradient k
= 1/(0.05*50Hz) =
40 %/Hz
"Stop Fre-
quency - Under-
frequency"
45 ‑ 66 [Hz] Frequency value at which
the power increase ends.
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