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A NEW ANALYTICAL DESIGN BASED ON THE EFFECT OF CLOSED-LOOP INTERACTION IN MULTI-LOOP CONTROL SYSTEMS

In multi-loop control systems, closed-loop interaction (β) can be used to enhance the stable and robust performance, but it is difficult to obtain exactly because there are several uncertain factors which make system
more and more complicatedly. Consequently, the new design method is aimed to specify closed-loop interaction and propose new multi-loop PI controller structure. The proposed design method can connect the closed-loop interactions and the Relative Gain Array (λ) for reducing the interaction successfully. It is shown that λ can be applied to the integral control mode which will be significant at low frequencies and decreases at high frequency, and β can be compensated for proportional gain which is predominant at high frequencies. Based on the property of dynamic interaction, the trade-off between λ and β is useful to bring the loop interaction into account and make multi-loop control system perform more perfectly. The proposed design method issimple, straightforward and easily implemented procedure. Several well-known process models are studied to demonstrate how simplicity and effectiveness of the proposed design method.

Từ khóa: Closed-loop Interaction Factor, Relative Gain Array (RGA), Integral of Absolute Error (IAE), Internal Model Control (IMC), Peak Magnitude ratio (Mp)

8 p ovanketv4 19/12/2016 404 2

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