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Chapter 3
CGCM-DLR Unit Operation
50
To activate cross-current compensation, you must do the following:
• Connect the generators in parallel.
• Connect the cross-current CT and generator VTs.
• Write the desired cross-current gain to the CrossCurrentGain tag.
• Enable excitation (tag SoftwareExcEn = 1).
• Remote Excitation Enable On (discrete input).
• Make sure that the CGCM-DLR unit is in AVR mode
(tag AVR_FCR Select = 0).
• Enable droop (V_DroopEn tag = 1).
• Select cross-current compensation (Droop_CCC_Select tag = 1).
When cross-current compensation is disabled or control power is removed from
the unit, the cross-current input terminals ID(+) and ID(-) are internally
connected together through a small impedance.
Auxiliary Input Regulation Adjustment
The auxiliary input provides a means to adjust remotely the regulation point of
the generator. This analog voltage (-10...10V DC) input signal changes the
setpoint of the selected operating mode by one percent of the applicable rated
value for each volt applied (positive or negative), multiplied by the auxiliary gain
setting for AVR/FCR or VAR/PF.
See
Chapter 4
for more information.
Auxiliary input gain settings range from -99...99. If the gains are set to zero, the
auxiliary input is inactive.
A typical use for this input is with a Power System Stabilizer where the
adjustment of the regulation point of the generator can increase system stability
during power system kW swings.
Line-drop Compensation
Line-drop compensation adjusts generator voltage proportional to generator
load. Line-drop compensation can be used to maintain voltage at a load that is at
a distance from the generator. Generator output reactive current is used to
increase the generator voltage with increasing load, which is based on the user
configurable line-drop compensation factor. Line-drop compensation is
adjustable from 0...10% of the voltage setpoint in 0.1% steps, which is the percent
voltage change at rated generator current. Line-drop compensation cannot be
used with droop or cross-current compensation.
(1) For series B devices, the input terminals are not connected together when control power is removed.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
(1)
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