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Design of decentralized PI control systems based on Nyquist stability analysis

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2 Author(s)
Dan Chen ; Dept. of Chem. Eng., California Univ., Santa Barbara, CA, USA ; Seborg, D.E.

Presents a simple but effective design method for decentralized PI control systems with guaranteed closed-loop stability. Nyquist stability conditions are analyzed for decentralized control systems. Formulas are derived that express the stability region for each PI controller in terms of the controller parameters. A detuning factor for each loop is specified based on a diagonal dominance index. Then appropriate controller settings are determined using this index and the stability region. Simulation results for a variety of 2 × 2 and 4 × 4 systems demonstrate that the proposed design method guarantees closed-loop stability and provides good set-point and load responses

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Control Applications, 2001. (CCA '01). Proceedings of the 2001 IEEE International Conference on

Date of Conference: