6
Active/Reactive Power Control and LVRT (Optional)
6.1 Active Power Control
6.1.1 Power Limit
Users can reduce inverter output power by set percentage of actual or rated power.
There are 2 settings for active power and 4 settings for reactive power control that can be
configured based on the requirement of the local network operator.
6.1.2 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 network operator.
Please refer to actual Power vs. Frequency shown in Figure 6-1 for the settings procedure.
24
Active/Reactive Power Control and LVRT (Optional)
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