Allen-Bradley 1407-CGCM-DLR, Руководство пользователя, Страница: 200 / 268

200 Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Appendix B CGCM-DLR Unit Math Models
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 Under-excitation Limiter Reference .
Figure 63 - Per-unit Block Diagram for Under-excitation Limiter
Figure 64 - Under-excitation Limiter Reference
Per-unit Block Diagram for Over-excitation Limiter shows the model of the
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
Over-excitation Limiter
Reference .