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Appendix B
CGCM-DLR Unit Math Models
Voltage Regulator
198
The
Per-unit Block Diagram for Rotating Rectifier Excitation System
model of the CGCM-DLR excitation system that is used with a brush-type
rotating exciter.
The rotating exciter parameters are not included in this discussion because they
are the responsibility of the exciter manufacturer. V
source for the excitation system.
A typical value for T
voltage (V
) and the exciter field voltage (V
P
V
= 1.4*V
/ V
RLMT
P
The gain K
is used for compensating variations in system configuration such as
G
power input voltage. The per unit base of the parameters V
nominal exciter field voltage at no load.
The PID gains K
P
each generator/exciter system. These continuous time gains are changed to
discrete and implemented in the CGCM-DLR digital controller. The PID gains
can be obtained from the PID Calculator software available from Rockwell
Automation.
Figure 60 - Per-unit Block Diagram for Rotating Rectifier Excitation System
V
/(V
0.005)
RLMT
p
-V
/(V
0.005)
RLMT
p
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
is 0. The forcing limit V
A
R
R
, K
, and K
are custom designed for the best performance for
I
D
shows the
is the input from the power
P
is related to the power-input
RLMT
) as follows:
and V
is the
P
R
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