Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
203
CGCM-DLR Unit Math Models
Appendix
B
Field Current Regulator
Per-unit Block Diagram for Rotating Rectifier Excitation System
shows the
model of the field current regulator that is 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
), the exciter field voltage (VR), and the programmed gain (K
G
) in
this equation.
V
RLMT
= 1.4*V
P
/ V
R
The gain K
G
is used to compensate 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)