Arcteq Generator Commander, Instruction Manual

Page: 441 / 561

Table. 6.2.1.3.4 - 360. PF control setting parameters.
Name Range Step Default Description
PF control status
0: PF mode ON
1: Synchronized Q
control OK
2: PF start ref ON
3: PF ref from bus
4: Increase PF ON
5: Decrease PF ON
6: Unloading Q
7: Increase blocked
8: Decrease blocked
9: SCL overexcitation ON
10: SCL underexcitation
ON
11: VHz limiter active
12: UEL limiter is ON
13: FCL is on limit
14: PF ref on high limit
15: PF ref on low limit
16: Tracking PF
reference
17: Increase command to
AVR/FCR ON
18: Decrease command
to AVR/FCR ON
- -
Displays the status of the power factor
control mode.
PF reference now -500.00…500.00p.u./p.u. 0.01p.u./p.u. 0.00p.u./p.u. Defines the reference value of the power
factor controller at the moment.
Minimum PF reference
allowed
-500.00…500.00p.u./p.u. 0.01p.u./p.u. 0.00p.u./p.u. Defines the minimum allowed value for
the power factor reference.
Maximum PF reference
allowed
-500.00…500.00p.u./p.u. 0.01p.u./p.u. 0.00p.u./p.u. Defines the maximum allowed value for
the power factor reference.
Minimum limit of the PF
controller
-1.000...1.000 arctan φ
0.001
arctan φ
-0.480
arctan φ
Defines the minimum angle for the PF
controller.
Maximum limit of the
PF controller
-1.000...1.000 arctan φ
0.001
arctan φ
1.000
arctan φ
Defines the maximum angle for the PF
controller.
Adjustment slew of
power factor reference
(power factor/second)
0.000...1.000Q/s 0.001Q/s 0.010Q/s
Defines the speed at which the
adjustment pulses increase or decrease
the value of the power factor reference.
6.2.1.4 Excitation limiters
Underexcitation limiter
The underexcitation limiter (UEL) prevents the generator excitation from dipping to such a low level as
to risk falling out of synchronization (out of step) with the grid. Since the stability limit expressed in
active and reactive power depends on the terminal voltage, the limiter itself is voltage-dependent and
its operation is instantaneous. The limiter has six setting points for the underexcitation curve. The limit
is typically set with a value that is 5 % higher than the underexcitation protection.
The diagram below depicts the transfer function of the underexcitation limiter (IEEE, type UEL2).
Genera Generattor Commander or Commander
Instruction manual
Version: 2.07
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