Table of Contents
Advertisement
Appendix B
CGCM-DLR Unit Math Models
200
The operating characteristics are designed to mimic the characteristics of the
limiter on the P-Q plane. The desired UEL curve is generated based on the user
input points.
Typical UEL reference is illustrated in
Figure 63 - Per-unit Block Diagram for Under-excitation Limiter
Figure 64 - Under-excitation Limiter Reference
Per-unit Block Diagram for Over-excitation Limiter
over-excitation limiter (OEL). The OEL creates the inner loop of the voltage
regulator and uses a PI type controller. In this control scheme, the actual field
current is compared with a reference field current. The operating characteristics
are designed to mimic the field current short-time overload capability that is
given in ANSI standard C50.13-1977. The reference field current is calculated
based on the user input parameters as shown in
Reference.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Under-excitation Limiter
shows the model of the
Over-excitation Limiter
Reference.
Advertisement
Table of Contents
