December 2002
Intermediate to advanced
800 pages
18h 7m
English
Content preview from Process Control: Modeling, Design, and Simulation
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M9.5. Three-Mode Level Control
In practice, a so-called three-mode level control strategy is used, as shown in Figure M9-3. The purpose of the flow controller is to reject boiler feedwater flow disturbances (due to upstream pressure changes or valve stiction, for example), while the feed-forward controller rejects steam demand disturbances. The level controller provides additional long-term corrective action.
Figure M9-3. Control instrumentation diagram for three-mode steam drum level control.
Develop a SIMULINK diagram for the 3-mode strategy, similar to that shown in Appendix M9.2. Tune the flow controller for tight performance (closed-loop time ...
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