Tuning of PI controllers with one-way decoupling in 2×2 MIMO systems based on finite frequency response data |
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Authors: | A. F. Gilbert A. Yousef K. Natarajan S. Deighton |
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Affiliation: | a Department of Chemical Engineering, Lakehead University, Thunder Bay, Ontario, Canada, P7B 5E1;b Department of Electrical Engineering, Lakehead University, Thunder Bay, Ontario, Canada, P7B 5E1 |
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Abstract: | A method of tuning for PI controllers with one-way lead/lag decoupling tuning is demonstrated for 2×2 input-output systems, based on finite frequency response data. The frequency response estimates are obtained from closed loop tests using an identification technique based on bandpass filters. The open-loop frequency response is calculated and used to tune PI controllers and to fit lead-lag compensators for decoupling by weighted least-squares. Separate optimization of the PI controllers and the lead-lag compensator is preferred. The tuning takes into account violations of desired multivariable robustness criteria. The method is illustrated by application to a paper machine headbox simulation and by experiments in distillation column temperature control. |
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Keywords: | Frequency response MIMO systems PID tuning Decoupling |
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