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VAR/Power Factor
Controller
Limiters
The VAR/PF controller is a summing point type controller and creates the
outside loop of a two-loop system. This controller is implemented as a slow PI
type controller. The voltage regulator forms the inner loop and is implemented as
a fast PID controller.
The model of the CGCM-DLR VAR and power factor controller is shown in
Per-unit Block Diagram for VAR Controller
Controller, respectively. Non-windup limit (V
VAR/PF controller output voltages (V
Figure 61 - Per-unit Block Diagram for VAR Controller
Figure 62 - Per-unit Block Diagram for PF Controller
Both the over-excitation limiter (OEL) and the under-excitation limiter (UEL)
in this implementation are of the summed limiter type as opposed to takeover
type.
Per-unit Block Diagram for Under-excitation Limiter
under-excitation limiter. The UEL creates the outer loop and the voltage
regulator creates the inner loop. The UEL uses a PI type controller.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
CGCM-DLR Unit Math Models
and
Per-unit Block Diagram for PF
) is used for bounding the
CLMT
and V
).
Q
PF
shows the model of the
Appendix B
199
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