Fronius GEN24 Operating Instructions Manual page 37

When the function is activated and the specified grid voltage limit value is ex-
ceeded, the effective power
- is reduced according to a defined gradient if the mains voltage is too high
(see example "System without storage" - red characteristic curve)
- is increased according to a defined gradient if the mains voltage is too low
(only possible with hybrid inverters, see example "System with storage" -
green characteristic curve).
In the case of a hybrid inverter with active grid support activated ("Active Grid
Support"), additional scenarios arise:
- If the output power has already been reduced to 0 W when the voltage is too
high and the voltage continues to rise, additional energy can be taken from
the national grid (the battery is thus charged, see "System with storage and
active grid support enabled" - blue characteristic curve in the lower "Power
Input" area).
- If the charging power (drawn from the national grid) has been reduced to
0 W when the voltage is too low and the voltage continues to drop, additional
energy can be drawn from the battery to increase the output power (see ex-
ample "System with storage and active grid support enabled" - blue charac-
teristic curve in the upper "Power Output" area).
Examples of active grid support:
"System without storage"
(graph - red characteristic
curve)
- "Mode": On (without Hys-
teresis)
- No battery in the system
- "Active Grid Support": Off
- "Calculation Mode": P
‑P
P (k*df)
m n
"System with storage and act-
ive grid support disabled"
(graphic - green characteristic
curve)
- "Mode": On (without Hys-
teresis)
- Battery is active
- "Active Grid Support": Off
- "Calculation Mode": P
‑P
P (k*df)
m n
Description of the parameters
(1) Momentary effective power when the
"Activation Threshold Overvoltage" is
reached: 50 % of P
nominal power)
=
max
(2) "Activation Threshold Overvoltage":
250 V
(3) "Gradient Overvoltage": 7.5 %/V
Description of the parameters
(1) (4) Momentary effective power when the
respective "Activation Threshold" is
reached: 50 % of P
nominal power)
=
max
(2) "Activation Threshold Overvoltage":
250 V
(3) "Gradient Overvoltage": 7.5 %/V
(5) "Activation Threshold Undervoltage":
210 V
(6) "Gradient Undervoltage": 7.5 %/V
(equipment -
n
(equipment -
n
37