Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 119)

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 119
CGCM Unit Startup Chapter 5
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 is changed 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.
VAR 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 VAR control operation.
1. Place the voltage control in Droop mode.
2. Adjust the prime mover to produce a constant power of approximately
25% of rated output.
3. Verify that the VAR setpoint is adjusted to the produced VARs.
In the following step, be prepared to transfer back to AVR Droop mode if
the excitation increases or decreases suddenly.
4. Transfer to VAR Control mode.
5. Adjust the VARs to 30% of the rated VA value.
6. Monitor the exciter field current and metered VARs to determine
performance during the following step.
7. Perform a 5% step of the VAR setpoint and observe the response of the
automatic VAR control.
8. Adjust gains as required to achieve the desired result, and run the test
again.