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Introduction
Synchronous Machine
Terminal Voltage
Transducer and Load
Compensator Model
CGCM-DLR Unit Math Models
This appendix contains the mathematical model of the CGCM-DLR unit
excitation systems.
The rotating rectifier model is based on the type AC8B model available in the
reference Computer Models for Representation of Digital-Based Excitation
Systems in the IEEE Transactions on Energy Conversion September 1996,
Vol. 11, No. 3. This paper was prepared by the Digital Excitation Task Force of
the Equipment Working Group, and jointly sponsored by the Performance and
Modeling Working Group of the Excitation System Subcommittee.
The CGCM-DLR unit implements the load compensation by using the vector
sum of the magnitudes of the terminal voltage and of the terminal current. The
model that is provided in IEEE Standard 421.5-1992 for terminal voltage
transducers and load compensators can be used to model this function in the unit
system as shown in the following equation.
Figure 59 - Terminal Voltage and Load Compensation Elements
V
T
V
C1
I
T
The values that are used in this model can be derived from the CGCM-DLR
settings as follows:
R
= 0 (Resistive load compensation not available)
C
X
= [1 - (1 - DRP/100))
C
T
= 5 ms
R
Where DRP is the percent droop that is programmed into the unit, values range
from -30...30.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
(
(
)I
)
=
abs V
+
R
+
jX
T
T
C
C
2
1/2
]
Appendix
V
1
C1
----------------- -
V
1
+
T
s
C
R
B
197
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