ABB UNITROL 1020 - Operating Modes

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 39
3.4.1 Operating Modes
There is a bumpless changeover between all modes performed by the Channel Follow-up
function. For more information see Chapter 3.4.1.5 - Channel Follow-up. Tuning and
other parameters are described in Chapter 3.4.1.6 - Description of Parameters.
3.4.1.1 Automatic Voltage Regulation (Auto)
Regulates the terminal voltage of the
synchronous machine.
Note:
Current measurement for compensation /
droop
PID Regulator
E
SM
3.4.1.2 Manual Control
Regulates the field current of the
excitation machine.
Note:
No limiters are active as long as this
mode is active.
PI Regulator
E
SM
3.4.1.3 PF or Var Regulation
Regulates the power factor or reactive
power of the synchronous machine.
Remark:
Var setpoint is normalized at 1pu terminal voltage
of the generator
PF
MVar
PID Regulator
E
SM
3.4.1.4 Open Loop
Control with a fixed output signal.
Note:
No limiters are active as long as this
mode is active.
E
SM