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Frequency-domain approach to robust PI control |
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| Authors: | Wieslaw Krajewski Stefano Miani Umberto Viaro |
| Institution: | a Systems Research Institute, Polish Academy of Sciences, ul. Newelska 6, 01-447 Warsaw, Poland b Department of Information Engineering, University of Padova, Via Gradenigo 6/b, 35131 Padova, Italy c Department of Electrical, Management and Mechanical Engineering, University of Udine, Via delle Scienze 208, 33100 Udine, Italy |
| Abstract: | The paper considers the problem of designing PI controllers for industrial processes approximated by a first-order time-delayed model. The suggested frequency-domain approach is based on a normalized open-loop transfer function and makes use of the loci of constant stability margins and other performance indices in the parameter space. In this way, it is possible to evaluate the effects of uncertainties in the process parameters and, thus, control system robustness. Some examples show how the procedure operates. |
| Keywords: | Process control Robustness PI controllers Time-delayed processes Stability margins |
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