mimo controllability and decentralized and plantwide control mimo controllability and decentralized...
TRANSCRIPT
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MIMO Controllability and Decentralized and Plantwide Control
Sigurd Skogestad on Manfred Morari’s contributions
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The start (1977): A PhD thesis on plantwide control
To: Terje Hertzberg & Kristian Lien From: Sigurd (April 1984):“Morari himself feels that his thesis is somewhat outdated and contains material of mainly academic interest”
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Times cited: 111 (from Web of Science)
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The origin of “Self-optimizing control”
But:- Largely forgotten until late 90’s- No unconstrained examples- Measurement noise not included
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Controllability: Chem. Eng. Sci. Series on “Design of resilient processing plants”
I. Process Design Under Consideration of Dynamic Aspects (w/ Lenhoff), 1982. (40 citations)
II. Design and Control of Energy Management Systems (w/ Marselle & Rudd), 1982 (46 citations)
III. A General framework for the assessment of dynamic resilience (alone), 1983 (112 citations)
IV. Some New Results on Heat Exchanger Network Synthesis (w/ Saboo), 1984 (42 citations)
V. The Effect of Deadtime on Dynamic Resilience (w/ Holt). 1985 (69 citations)
VI. The Effect of Right-Half-Plane Zeros on Dynamic Resilience (w/ Holt), 1985 (85 citations)
VII. Design of Energy Management System for Unstable Reactors: New Insights (w/ Grimm, Ogelsby, Prosser), 1985 (20 citations)
VIII. A Resilience Index for Heat Exchanger Networks (w/ Saboo, Woodcock), 1985, (49 citations)
IX. Effect of Model Uncertainty on Dynamic Resilience (w/ Skogestad), 1987 (30 citations)
NaN. New characterization of the effect of RHP zeros (w/ Zafiriou and Holt), 1987 (9 citations)
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40 citations
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DPI = Integral squared error J
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112 citations
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9 citations
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97 citations
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67 citations
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152 citations
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Aside (and small comfort for young researchers):
In fact, Early M2 work is not highly cited…• 1st journal paper
Title: FINITE STABILITY REGIONS FOR LARGE-SCALE SYSTEMS WITH STABLE AND UNSTABLE SUBSYSTEMS
Author(s): MORARI M; STEPHANOPOULOS G; ARIS R Source: INTERNATIONAL JOURNAL OF CONTROL Volume: 26 Issue: 5 Pages: 805-815 Published: 1977 Times Cited: 2 (from Web of Science).
• 2nd journal paper Title: FINDING GENERIC RANK OF A STRUCTURAL MATRIX - COMMENTS Author(s): MORARI M; STEPHANOPOULOS G;; Source: IEEE TRANSACTIONS ON AUTOMATIC CONTROL (Technical Note), 509-510, 1978 Tines Cited: 5
• 3rd journal paper Title: SYNTHESIS OF DISTILLATION SCHEMES WITH ENERGY INTEGRATION Author(s): FAITH DC; MORARI M Source: COMPUTERS & CHEMICAL ENGINEERING Volume: 3 Issue: 1-4 Pages: 269-272 Published: 1979 Times Cited: 3
• 4th journal paper Title: STABILITY ANALYSIS OF STRUCTURED CHEMICAL-ENGINEERING SYSTEMS VIA DECOMPOSITION Author(s): MORARI M; STEPHANOPOULOS G; ARIS R Source: CHEMICAL ENGINEERING SCIENCE Volume: 34 Issue: 1 Pages: 11-15 Published: 1979 Times Cited: 4
• Title: STABILITY OF MODEL-REFERENCE ADAPTIVE-CONTROL SYSTEMS Author(s): MORARI M Source: INDUSTRIAL & ENGINEERING CHEMISTRY PROC. DES. & DEV. Volume: 19 Issue: 2 Pages: 279-281 Published: 1980 Times Cited: 0
• Title: USING AN ADAPTIVE-OBSERVER TO DESIGN POLE-PLACEMENT CONTROLLERS FOR DISCRETE-TIME-SYSTEMS Author(s): SHAHROKHI M; MORARI M Source: INTERNATIONAL JOURNAL OF CONTROL Volume: 36 Issue: 4 Pages: 695-710 Published: 1982 Times Cited: 0
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Coleman BrosilowManfred Morari
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Times cited: 412
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Decentralized control
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Citations: 163
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Citations: 156
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Times cited: 83
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Times cited: 80
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A little confusion on “constrained control”:• Is it active constraints control (steady-state) ?• Is it dealing with constraints dynamically (today: MPC) ?
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Rule of plantwide control: Control active constraints(steady-state optimal operation)
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??
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??
Manfred, seems you are mixing 1. optimally active constraints (steady-state) 2. dynamic saturation
Example car:J = T (minimize driving time from A to B)u = engine power Constraints: u < umax v < vmax (speed limit)
1. Steady-state. What should we control?Flat road: CV = v (active constraint with setpoint = vmax – backoff)Steep hill: CV = u (active constraint with setpoint = umax)
Switching between these two cases is trivial.
2. Dynamic. Flat road with increase in speed limit (vmax): May temporary reach umax-constraint (use MPC?)
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Caltech group 1987
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Caltech ChE brochure 1988
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March 1990
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No plantwide, decentralized or controllability/resilience.
2 on distillation design!
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Conclusion: Contributions M2
• Plantwide: Some major, a little confusion?
• Controllability (“dynamic resilience”): Major
• Decentralized: Major
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Top 3 robustness papers1. Title: Robust constrained model predictive control using linear matrix inequalities
Author(s): Kothare MV; Balakrishnan V; Morari M Source: AUTOMATICA Volume: 32 Issue: 10 Pages: 1361-1379 DOI: 10.1016/0005-1098(96)00063-5 Published: OCT 1996 Times Cited: 567 (from Web of Science)
2. Title: ROBUST-CONTROL OF ILL-CONDITIONED PLANTS - HIGH-PURITY DISTILLATION Author(s): SKOGESTAD S; MORARI M; DOYLE JC Source: IEEE TRANSACTIONS ON AUTOMATIC CONTROL Volume: 33 Issue: 12 Pages: 1092-1105 DOI: 10.1109/9.14431 Published: DEC 1988 Times Cited: 151 (from Web of Science)
3. Title: ROBUST-CONTROL OF PROCESSES SUBJECT TO SATURATION NONLINEARITIES Author(s): CAMPO PJ; MORARI M Source: COMPUTERS & CHEMICAL ENGINEERING Volume: 14 Issue: 4-5 Pages: 343-358 DOI: 10.1016/0098-1354(90)87011-D Published: MAY 1990 Times Cited: 124 (from Web of Science)
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