Derating Of Power - Woodward easYgen-2000 Series User Manual

Configuration
Configure Application > Configure Controller > Derating Of Power
4.5.12.3

Derating Of Power

General notes
Function
Example
282
This function is used to decrease the current active power setpoint
linear according to any value offered by the Analog Manager in
mains parallel operation. The unit is capable to derate power e.g.
according to the standards of power supply companies.
Refer to Ä Chapter 6.4.12 "Ripple Control Receiver"
on page 403 for an application example.
When the LogicsManager "Free derating" (parameter
15146 Ä p. 283) becomes TRUE and the analog value exceeds
the value "Start derating at" (parameter
begins to reduce the present active power setpoint. The grade of
reducing depends on the value "Stop derating at" (parameter
15144 Ä p. 283) and the value of "Max. power deviation" (param‐
eter 15145 Ä p. 283) which are configurable. If the LogicsMan‐
ager "Free derating" becomes FALSE, the unit ramps back to its
original setpoint. If derating is active, the display shows the indica‐
tion "Derating".
Current power setpoint of the generator = 200 kW
n
Start derating at = 80 °C water temperature (i.e. analog input 1)
n
Stop derating at = 90 °C water temperature
n
Max. power deviation = 30 % (60 kW)
n
If the engine is running, the LogicsManager "Free derating" is
TRUE, the unit monitors the water temperature. If the water tem‐
perature remains below the value "Start derating at", the reduction
becomes not active and remains on 0 %. If the water temperature
exceeds the value "Start derating at" the unit begins to derate the
current active power setpoint. The rate of reduction (slope) is
determined by the values "Start derating at" and "Stop derating at".
The minimum power is defined by the value "Max. power devia‐
tion". In the following example the power reduction would increase
from 0 % at 80 °C up to 30 % = 60 kW at 90 °C. All temperatures
over 90 °C would cause the same reduction of 30 % in this
example. So it is guaranteed that the engine is not running with to
less load.
easYgen-2200/2500 | Genset Control
15143 Ä p. 283), the unit
37535B