Frequency-Dependent Power Droop - Deif GPC-3 Designers Reference Handbook

GPC-3 DRH 4189340587 UK

4.10 Frequency-dependent power droop

This droop function can be used when the genset is parallel to the mains. In case the frequency drops or
rises due to instability of the mains, the curve for frequency-dependent droop is made to compensate the
power set point.
Example:
With a nominal frequency of 50 Hz and an actual frequency of 51.5 Hz, there is a deviation of 1.5 Hz which is
equal to a 3 % deviation from the nominal setting. The genset will then droop to 400 kW according to the
vector diagram below.
10% 9% 8% 7% 6%
The vector diagram above is configured with the parameter settings as in the following table.
The curve can be designed inside MIN/MAX [kW] area.
DEIF A/S
P [KW]
MAX
DBH
HYSH
SLPL
HYSL
DBL
MIN
5% 4% 3% 2% 1% 0%
SLPH
1% 2% 3% 4% 5% 6%
Additional functions
Fixed Power Setpoint
(Fnom-fact)*100/fact [%]
7% 8% 9% 10%
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