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PF Control
Perform this test with the generator operating in parallel with a large power
source that is maintaining constant voltage.
Follow these steps to test the PF control operation.
1. Place the voltage control in Droop mode.
2. To produce a constant power of approximately 25% of rated output, adjust
the prime mover.
3. Verify that the PF setpoint is adjusted to the measured PF.
Be prepared to transfer back to AVR Droop mode if the excitation
increases or decreases suddenly.
4. Transfer to PF Control mode.
5. To determine performance during the following step, monitor the exciter
field current and metered PF.
6. Perform a 0.10 step of the PF setpoint and observe the response of the
automatic PF control.
Adjust gains as required to achieve the desired result, and run the test
again.
Real Power Load Sharing Operation
Perform this test with two machines that are connected in parallel.
Follow these steps to test the Real Power Load Sharing operation.
1. Place one prime mover in constant-speed control, and the other in manual
load control (typically droop).
2. Adjust the load to a reasonably balanced condition by adjusting the speed
setpoint of the droop machine.
3. Enable the real load sharing function on both machines.
4. Switch the droop machine to constant speed control and observe the real
power and load share error reported from the CGCM-DLR unit on each
machine.
5. Verify that the real power balances between the two generators as required
and that the load share error from each unit approaches zero.
6. Adjust load share rate and limit as required to provide stable load share
operation.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
CGCM-DLR Unit Startup
Chapter 5
135
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