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International Conference on Mechanical and Electrical Technology 2009 (ICMET 2009)

Wenzheng Li
Wenzheng Li
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An Equivalence of Smith Predictor based on the desired closed-loop transfer function for set-point changes with Internal Model Controller for Process Systems method is proposed. Analytical expressions for PID controllers based on Internal Model Controller structure is derived for third order process models; Simulation example for a practical blending process demonstrates that these methods are equivalent to each other on certain premises. The design method based on internal model controller provides better step-response than the standard Smith Predictor. This explains why they are widely used in process control and provides insight into the work of bringing these techniques together to control system design.

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