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Power Factor Regulation Mode (PF)
In PF mode, the CGCM-DLR unit controls field excitation current output to
maintain the commanded power factor setpoint. The CGCM-DLR unit uses the
measured generator voltages and currents to calculate power factor. The PF
feedback loop includes adjustable proportional and integral gains. To activate PF
mode:
• The metering CTs and VTs must be properly connected and configured.
• The PF mode gains must be set.
• The desired power factor setpoint must be written to the PFSetpt tag.
• Excitation enabled (tag SoftwareExcEn = 1).
• Remote Excitation Enable On (discrete input).
• The CGCM-DLR unit must be in AVR mode
(tag AVR_FCR_Select = 0).
• Droop must be enabled (V_DroopEn tag = 1).
• Droop must be selected (Droop_CCC_Select tag = 0).
• Automatic reactive power control must be enabled (tag PF_VAR_En = 1).
• Power factor control must be selected (tag PF_VAR_Select = 0).
Reactive Power Regulation Mode (VAR)
In VAR mode, the CGCM-DLR unit controls field excitation current output to
maintain the commanded reactive power setpoint. The CGCM-DLR unit uses
the measured generator voltages and currents to calculate reactive power. The
VAR feedback loop includes adjustable proportional and integral gains. To
activate VAR mode:
• The metering CTs and VTs must be properly connected and configured.
• The VAR mode gains must be set.
• The desired reactive power setpoint must be written to the VARSetpt tag.
• Excitation enabled (tag SoftwareExcEn = 1).
• Remote Excitation Enable On (discrete input).
• The CGCM-DLR unit must be in AVR mode
(tag AVR_FCR_Select = 0).
• Droop must be enabled (V_DroopEn tag = 1).
• Droop must be selected (Droop_CCC_Select tag = 0).
• Automatic reactive power control must be enabled (tag PF_VAR_En = 1).
• VAR control must be selected (tag PF_VAR_Select = 1).
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
CGCM-DLR Unit Operation
Chapter 3
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