Comparative Study of Three Practical IMC Algorithms with Inner Controller of First and Second Order

Vasile Cirtoaje, Alina Baiesu

Abstract


The structure of the studied IMC algorithms incorporates a plant model of first or second order plus deadtime (which can be obtained experimentally from the plant response to a step input) and a realizable inner controller of first or second order. The inner controller has not a tuning filter time constant as usual, but a tuning gain K that can be used by the process operator to generate a stronger or weaker control action. All algorithms have mainly four parameters: the tuning gain K and three model parameters (the model steady- state gain, the model deadtime and the model transient time). Some numerical applications are presented to show the control performance of each proposed algorithm for both proportional-type plants with and without overshoot. 


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