ABB UNITROL 1020 - Page 49

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 41
Default Level of the setpoint if the digital input
Excitation ON is not active.
Mode
Initial Setpoints
Auto, Manual and Open Loop initial setpoints
can be configured.
Auto
100% (configurable)
Manual
0% (configurable)
Open Loop
0% (configurable)
PF
1.0
Var
0%
The limits and ramp rate can be set separately for each operating mode.
The setpoints of the non-active regulators follow the relevant operating point. For
example, for reactive power regulation (Var) the setpoint of the auto regulator follows the
current machine voltage. This allows surge-free switching between operating modes if the
new setpoint is within the setpoint limit.
Regulator Tuning
Auto (voltage control)
- Proportional gain
- Derivative time
constant
- Integral time
constant
Proportional Gain Vp
Derivation Time Tb [s]
Integration Time Ta [s]
Vp
1257
[rad/s]
1/Ta
Gain
[p.u.]
1/Tb
4 Vp
Compensation or
droop
Droop Kq [%]
[%]
Compensation
Droop
Kq= 0.00 (no effect)
Kq= 20% (max. compensation)
Kq= -20% (max. droop)
Machine voltage
Reactive current
[%]
The second droop setting can be selected by digital input or over Modbus. Droop setting can be
selected on active power as well.
PF or Var Control
and PQ Limiter
Proportional Gain Vp
Derivation Time Tb [s]*)
Integration Time Ta [s]
*) Only one parameter, see
voltage control
P [W]
Q+ [var]
PF
Var
PF
Active power
Reactive power
overexcitedunderexcited
Q-
Generator
Motor