Chapter 5 - Commissioning
UNITROL 1020 User Manual 3BHS335648 E82 91
Parallel with Grid status is not active
Only active, if parallel with Grid status is active
Only active, if parallel with Grid status is active
Active, if no other operation mode is active
5.3.1.19 Tune, Auto
The PID tuning tool is on the CMT1000 CD. The following settings can be preset on the
basis of the machine data.
Integral time constant Ta
This lies within the range of Td‘ of the main machine.
Setting: Ta = 1.0 to 1.5 x Td‘ (Typical value 2 to 5 s).
(Optimized for load conditions)
Derivative time constant Tb
This approximately compensates the load time constant TE of the exciter machine.
Setting: Tb = 0.7 to 1.0 * TE (Typical value 0.1 to 0.3 s).
Proportional gain Vp
This most important setting value depends primarily on the controlled system.
If the ceiling factor Kceil has been set correctly, values between 10 and 40 should result in
stable regulation of the machine.
A default value of 20 is set for the first excitation.
Note: Since the Kceiling affects Vp from all the operating modes, be sure to calculate this
value before tuning the AVR. If Kceiling has changed after tuning, the AVR shall be re-tuned
again.
Reactive power influence Kq
In case of machines which, without step-up transformers, are connected to the fixed grid
or, via a busbar, to other synchronous machines, it is essential that the droop Kq is set to a
negative value of -5 to -20%. A higher negative value makes the machine more
independent of voltage fluctuations in the grid. This stabilizes the reactive power output or
consumption in those configurations. At low negative values, the machine will support the
grid or busbar voltage.
In the case of machines with step-up transformers, the voltage drop of the transformer can
be partly compensated with positive values of Kq.
After step up transformer
Drop of 5%
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