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Process Control: Modeling, Design, and Simulation by B. Wayne Bequette

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8.12. Summary

The IMC design procedure is exactly the same as the open-loop control design procedure. Unlike open-loop control, the IMC structure compensates for disturbances and model uncertainty. The IMC tuning (filter) factor, λ, is used to detune for model uncertainty. It should be noted that the standard IMC design procedure is focused on setpoint responses, but good setpoint responses do not guarantee good disturbance rejection, particularly for disturbances that occur at process inputs. A modification of the IMC design procedure was developed to improve input disturbance rejection. Tolerance of model uncertainty is called robustness and was discussed in more detail in Chapter 7.

Like open-loop control, the disadvantage compared with standard ...

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