Parametric Robust Control of the Multivariable 2 × 2 Looper System in Steel Hot Rolling: A Comparison between Multivariable QFT and H

Two robust mutlivariable controllers, H∞ and a decentralized quantitative feedback theory (QFT), are designed in the frequency domain for the 2 × 2 looper system in a steel hot rolling mill to keep stability in the presence of parametric uncertainties. The H∞ controller is designed by using the mixe...

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Bibliographic Details
Published in:Metals (Basel ) 2019, Vol.9 (8), p.839
Main Authors: Cantú, Luis F., Mendiola, Pedro, Domínguez, Álvaro A., Cavazos, Alberto
Format: Article
Language:English
Subjects:
Control stability
Control systems design
Controllers
Design
Frequency domain analysis
H-infinity control
hot rolling
Hot rolling mills
Hot-rolled steel
looper control
Multivariable control
parametric uncertainties
QFT
Quantitative feedback theory
Robust control
SISO (control systems)
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Summary:Two robust mutlivariable controllers, H∞ and a decentralized quantitative feedback theory (QFT), are designed in the frequency domain for the 2 × 2 looper system in a steel hot rolling mill to keep stability in the presence of parametric uncertainties. The H∞ controller is designed by using the mixed sensitivity approach, while the multivariable decentralized QFT is designed by the extension of the sequential loop closing method presented elsewhere. Stability robustness conditions are verified in the frequency domain, while simulations in time domain are carried out to evaluate the controllers and compare their performance along with that of proportional + integral (PI) and single input single output (SISO) QFT controllers designed earlier. The QFT controller shows the best balance among the performance indicators analyzed here; however, at the expenses of using higher power in one of the control inputs.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9080839