Frequency Depending Derating Of Power - Woodward easYgen-2000 Series User Manual

Configuration
Configure Application > Configure Controller > Frequency Depending Derati...
4.5.12.4

Frequency Depending Derating Of Power

General notes
Function
Example
Start conditions
Stop conditions
284
This controller function is supporting a dynamic stabilization of
mains. Some grid codes require to derate the real power if the
mains frequency increases to a value of e.g. 50.20 Hz (F
derating is stopped, if the frequency becomes lower than e.g.
50.15 Hz (F ).
Stop
Fig. 98: Frequency depending derating of power (schematic)
If the frequency increases the value F
5782 Ä p. 285), the momentary power of the generator will be
memorized by the controller as an internal value P
power will be derated with a gradient R [%/Hz] (parameter
5784 Ä p. 285). The power derating is shown in Fig. 98.
The power derating ΔP may be calculated using the following for‐
mula:
ΔP = P [kW] x R [%/Hz] x (F
M
The example uses the following values:
P = 130 kW
n
M
R = 40 %/Hz (parameter
n
F = 50.20 Hz (parameter
n
Start
F = 50.50 Hz
n
Mains
The power derating ΔP is calculated as follows:
ΔP = 130 kW x 40 %/Hz x (50.50 Hz - 50.20 Hz] / 100 % = 15.6
n
kW
The assumed frequency increases to 50.70 Hz:
n
ΔP = 130 kW x 40 %/Hz x (50.70 Hz - 50.20 Hz] / 100 % = 26.0
n
kW
The derating becomes inactive, if the frequency becomes lower
than F (Parameter
Stop
too high, the frequency monitoring function trips.)
The power derating function becomes active, if the following condi‐
tions are true:
Mains frequency > F
n
Mains parallel operation active (MCB, GCB and if applicable
n
GGB are closed) AND
easYgen is in AUTOMATIC mode AND
n
The corresponding controller functions are switched "On"
n
The power derating function becomes inactive and will be reset, if
at least one of the following conditions is true:
easYgen-2200/2500 | Genset Control
(Parameter
Start
[Hz] - F [Hz]) / 100 [%]
Mains Start
5784 Ä p. 285)
5782 Ä p. 285)
5783 Ä p. 285). (If the frequency becomes
(parameter 5782 Ä p.
Start
). The
Start
M . Now the
285) AND
37535B