Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 191)

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 191
CGCM Unit Math Models Appendix B
Field Current Regulator Per-unit Block Diagram for Rotating Rectifier Excitation System shows the
model of the CGCM field current regulator used with a brush-type rotating
exciter. V
P
is the input from the power source for the excitation system.
Typical value for T
A
is 0. The forcing limit V
RLMT
is related to the power-input
voltage (V
P
) to the CGCM, the exciter field voltage (V
R
) and the programmed
gain (K
G
) in this equation.
V
RLMT
= 1.4*V
P
/ V
R
The gain K
G
is used for compensating variations in system configuration
dependent gains such as power input voltage.
The PI gains K
P
and K
I
are the same as the PI gains K
P
and K
I
for the voltage
regulator. The PID gains can be obtained from the PID Calculator software
available from Rockwell Automation.
Figure 69 - Per-unit Block Diagram for Rotating Rectifier Excitation System
V RLMT (V p 0.00013)
-V RLMT (V p 0.00013)