- Rated generator voltage
- Generator PT primary voltage rating
- Generator PT secondary voltage rating
- Voltage set point
- Generator frequency
- Knee frequency
- Integral gain
- Derivative gain
- Proportional gain
- Loop gain
- Rated generator current
- Generator CT current primary rating
- Generator CT current secondary rating
- Operating mode
- VAR set point
- VAR integral gain
- VAR loop gain
- Reactive droop
When the generator is connected in parallel with an infinite bus (utility), the voltage of the generator is controlled by the infinite bus. The voltage of the generator will change as the infinite bus voltage changes. The system voltage cannot be controlled when the generator is connected to an infinite bus. In this instance, the digital voltage regulator must regulate the reactive power output which is supplied by the generator. There are two methods for regulating the reactive power output.
- Kilo-Volt-Ampere-Reactive (KVAR) regulation
- Power factor (PF) regulation
Note: KVAR is the unit of measurement for reactive power.
When the digital voltage regulator is in the power factor operating mode, the DVR works to produce a constant power factor. The DVR works to produce a constant power factor regardless of the real power output of the generator. In this case, the reactive current will change when the real power output of the generator changes. A current transformer (CT) is necessary for this mode to work. PF operating mode must be selected.
For stable operation of the generator in the PF regulating mode, the generator must be connected to one of the following:
- A utility
- A system that is much larger than the generator
When the tie breaker is closed to the utility, connect terminals "P9-9" and "P9-6" in order to enable the PF mode. If terminals "P9-9" and "P9-6" are disconnected from each other, the regulator will be in a voltage control operating mode. The regulator will be in a voltage control operating mode with or without the following:
- Droop
- Line loss compensation
"PF" mode must be selected in software and the "KVAR/PF" contact must be closed. Refer to the following contacts: "P9-6" and "P9-9". When the contact is not closed, the regulator operates in AVR mode.
A remote KVAR/PF adjust toggle switch may be used in order to fine-tune the PF set point. Refer to the following contacts: "P9-4", "P9-5" and "P9-6". The remote KVAR/PF switch may be the same switch used for remote voltage adjustment. Raising the PF set point will make the PF more lagging. The lagging PF is a positive PF. Lowering the PF set point will make the PF more leading. The leading PF is a negative PF. When the contact for KVAR/PF is closed, and the PF mode is selected, then the switch will not adjust the voltage setting.
Note: The KVAR/PF contact does not specify if the CDVR is in KVAR or PF mode specifically. PF mode must be selected in software.
Note: When operating in parallel operations, make sure that "Droop" mode is selected. The "Droop" mode must be selected in the "Settings" screen. A 0% droop may be selected.