User Manual
98
12.3.3 Frq-Watt Response
Tab. 12-6
Description of Frq-watt Parameters
Parameter
Description
Default
Range
OverFrq Start
The Start frequency value for
over-frequency response
50.25 Hz
50.00 Hz–
55.00 Hz
OverFrq End
The Stop frequency value for
over-frequency response
52.00 Hz
50.00 Hz–
55.00 Hz
UnderFrq Start
The Start frequency value for
under-frequency response
49.75 Hz
45.00 Hz–
50.00 Hz
UnderFrq End
The Stop frequency value for
under-frequency response
49.00 Hz
45.00 Hz–
50.00 Hz
Response to an increase in grid frequency:
When there is an increase in grid frequency which
exceeds the Start value (
50.25 Hz
), the inverter
will reduce the power output linearly with an
increase of frequency until the End value (
52.00
Hz
) is reached.
When the frequency exceeds the End value, the
inverter output shall be ceased (i.e. 0 W).
OverFrq Start
OverFrq End
50.25 Hz
52.00 Hz
The output power will remain at or below the lowest power level reached in
response to an over-frequency event between 50.25 Hz and 52 Hz. This is to
provide hysteresis in the control of the inverter.
When the grid frequency has decreased back to 50.15 Hz or less for at least
60 s, the power level will be increased at a rate no greater than the power
ramp rate limit, which can be set according to “
”.
Output Power
Grid Frequency, Hz
46.5
47.0 47.5
48.0
48.5
49.0
49.5 50.0
50.5
51.0
51.5
52.0 52.5
Rated power of inverter
Inverter power output prior
to frequency disturbance
Inverter to disconnect
when
f
≤
47 Hz
Required power reduction of
inverter in response to
exceeding 50.25 Hz to 52 Hz
Max. power level of inverter in
response to frequency returning
to 50 Hz after a disturbance
Allowed ramp up rate once
frequency has returned to
50.15 Hz for at least 60 s
Fig. 12-5
Frq-Watt Mode for Over-frequency Conditions
