AGC Designer’s Reference Handbook
DEIF A/S Page 123 of 168
7. PI controller
The unit controller is a PI controller. It consists of a proportional regulator and an integral
regulator. The PI controller is able to eliminate the regulation deviation and can easily be tuned
in.
Controllers
There are two controllers for the governor control and, if option D1 is selected, also two
controllers for the AVR control.
Controller
GOV AVR Comment
Frequency X Controls the frequency
Power X Controls the power
Voltage (option D1) X Controls the voltage
VAr (option D1) X Controls the power factor
The table below indicates when each of the controllers is active. This means that the controllers
can be tuned in when the shown running situations are present.
Governor AVR (option
dependent)
Schematic
Frequency Power Voltage VAr
X X
X X
X X
X X X X
The frequency (and voltage) controller is activated when the gen-set is running in island
operation, stand-alone or load sharing mode. The power (and VAr) controller is activated when
the gen-set is running parallel to the mains or in load sharing mode.
G
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