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A method for improving the robustness of PID control

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4 Author(s)
S. Skoczowski ; Inst. of Control Eng., Szczecin Univ. of Technol., Poland ; S. Domek ; K. Pietrusewicz ; B. Broel-Plater

In this paper, an effective method is proposed for robust proportional-integral-derivative (PID) control that is easily implementable on commonly used equipment such as programmable logic controller (PLC) and programmable automation controller (PAC). The method is based on a two-loop model following control (MFC) system containing a nominal model of the controlled plant and two PID controllers. Basic features exhibited by the MFC structure are presented, and a technique to tune both component controllers is given. The proposed structures have been implemented in a programmable logic controller and tested on control plants with perturbed parameters. Also, the proposed control system has been checked for its performance in cases when the operation of PID controllers is based on fuzzy logic. Tuning rules for the fuzzy controllers in the presented MFC system have been proposed. Results of tests lend support to the view that the proposed control structures may find wide application to robust control of plants with time-varying parameters.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:52 ,  Issue: 6 )