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

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10.9. Summary of Feed-Forward Control

We have developed feed-forward control based on models of the disturbance and process transfer functions. If the disturbance and process models are not available, feed-forward control can still be implemented as a tunable gain plus lead-lag controller. You should consider the following important issues when implementing feed-forward control:

  • The feed-forward controller must be physically realizable and stable, as noted by the next three items.

    • The disturbance time delay must be greater than the process time delay for perfect feed-forward compensation. If the process time delay is greater than the disturbance time delay, the feed-forward controller will have no time-delay compensation, and perfect control cannot ...

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