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Droop (reactive current compensation) Operation
Perform this test with the generator operating in parallel with a large power
source that is maintaining constant voltage. You could also use one or more
additional generators.
Follow these steps to test Droop operation.
1. To maintain constant real power adjust the prime mover.
2. Adjust the voltage setpoint with the unit in Voltage Droop mode.
3. Monitor the reactive power and verify that the measured reactive power
changes by the expected amount.
EXAMPLE
Cross Current (reactive differential compensation) Operation
Perform this test with the generator operating in parallel with a large power
source that is maintaining constant voltage. You could also use one or more
additional generators.
Follow these steps to test the cross current operation.
1. Safely disconnect the cross-current loop (reactive differential
inter-connection) with parallel machines.
The cross-current CT for the generator under test must remain connected
to its CGCM-DLR unit.
2. To produce a constant power of approximately 25% of rated output with
the voltage control in AVR Droop mode, adjust the prime mover.
3. Change the mode of operation to cross-current compensation.
4. Adjust the voltage setpoint.
5. Monitor the reactive power and verify that the measured reactive power
changes by the expected amount.
For example, if the cross-current compensation gain is 5%, and the voltage
setpoint changes by 1%, the expected change in reactive power is 20% of
rated kVA.
6. Repeat the same test on each machine.
7. Reconnect the cross-current loop.
8. Connect two or more machines in parallel (not connected to an infinite
source) and apply a load.
9. Verify that the generator voltage does not decrease and the reactive power
is shared among the machines.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
If the droop setpoint is 5%, and the voltage setpoint changes by
1%, the expected change in reactive power is 20% of rated kVA.
CGCM-DLR Unit Startup
Chapter 5
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