6.4.3 Power vs. Frequency
According to VDE-AR-N 4105 (5.7.3.3):
At frequencies between 50.2Hz and 51.5Hz, all adjustable power generation
systems shall reduce (for frequency increase) or increase (for frequency
decrease) the active power Pm generated instantaneously (at the time of
exceeding the mains frequency 50.2Hz; freezing the value on the current level)
with a gradient of 40% of Pm per Hertz).
According to CEI 0-21 (8.5.3.2):
Within a frequency range from 50.3Hz to 51.5Hz, all adjustable production
plants equipped with static converters have to be able to reduce the currently
generated active power in case of an increase of the frequency with a variable
drop of 2% to 5% with a default value of 2.4% (with corresponds to a power
gradient of 83.3%/Hz).
User can set all necessary settings to meet the requirements from the network
operator. Please refer to actual Power vs. Frequency shown in Figure 6-1 for
the settings procedure.
P
0
Gradient 40% Pm/Hz
Pm
Fstart(50,2Hz)
P
0
Fstart(50,3Hz)
Gradient 83.3% Pimax/Hz
Pimax
Figure 6-1 : Power vs. frequency characteristic
Power vs. frequency curve for VDE-AR-N 4105
Power vs. frequency curve for CEI-021
29
Active/Reactive Power Control and LVRT (Optional)
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