Parameter
Range
Default
Notes
Analogue
: The controller uses an analogue output to regulate the AVR (only visible if
an analogue AVR regulator output is configured).
Regulation delay
This parameter sets the time the controller waits before starting to regulate the genset. The delay time starts after the running
feedback confirms that the genset is running. It is not desirable to start regulation exactly when running feedback is achieved.
Frequency and voltage are at this point, still low compared to nominal value. The regulation delay is intended to delay regulation
until the governor and AVR have settled frequency and voltage on their preset values. This prevents regulation overshoot at start-up.
Parameter
Range
Default Notes
Regulator delay 0 s to 1 h 2 s
The controller waits for the amount of time specified by this parameter, before regulating the
genset.
This time can for example be used to set the regulation mode.
Parameters
The AVR regulation set point settings apply to all the controller's AVR regulation outputs (for example, relay or analogue). You can
configure the AVR common settings under
Configure > Parameters > Regulators > AVR regulation set points
.
INFO
To see these parameters, you must configure an AVR output function.
Reactive power ramp up
This parameter defines the speed of the ramp up of the genset reactive power when the genset is connected to a busbar or when
the fixed reactive power set point changes. The ramping functionality ramps the regulation set points to follow the configurable curve
towards the final set point. This reduces the mechanical strain on the genset when the breaker closes and the genset starts to
supply power to the system. Limiting the power ramp up speed also increases the system stability.
The parameter consists of one curve. The curve can consist of 2 to 10 coordinates for the time and the percentage of the genset
nominal reactive power.
Parameter Range
Default ramp 1 Notes
[s]
0 to 3600 s 0 s; 50 s
The time coordinate for the reactive power ramp up curve.
[%]
0 to 100 % 0 %; 100 %
The percentage of nominal reactive power of the genset coordinate for the reactive
power ramp up curve.
Reactive power ramp up using reactive power curve example
You want a 100 kvar genset to ramp up to 50 % of its nominal reactive power at 5 %/s, and 10%/s between 50 % and a
100 % of its nominal reactive power. This means that it will take at least 15 seconds to ramp up the genset reactive power
from 0 kvar to 100 kvar.
The coordinates for the primary power ramp up curve are: (0 s; 0 %), (10 s; 50 %) and (15 s; 100 %).
This means that the controller regulates the genset to ensure that the reactive power ramp up does not exceed 5 kvar/s for
the first 50 % of the genset's nominal reactive power. And the controller regulates the genset to ensure that the reactive
power ramp up does not exceed 10 kvar/s between 50 % and a 100 % of the genset's nominal reactive power.
If the genset reactive power is 0 kvar, and 50 kvar is required from the genset, it takes at least 10 seconds to ramp up the
genset reactive power.
If the genset reactive power is 0 kvar, and 70 kvar is required from the genset, it takes at least 12 seconds to ramp up the
genset reactive power.
DESIGNER'S HANDBOOK 4189340911K UK
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