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In model-based real-time optimization, plant-model mismatch can be handled by applying bias- and gradient-corrections to the cost and constraint functions in an iterative optimization procedure. One of the major challenges in practice is the estimation of the plant gradients from noisy measurement data, in particular for several optimization variables. The recently published open-access paper “A Reliable Modifier-Adaptation Strategy for Real-Time Optimization” describes a new real-time optimization scheme that explores the inherent smoothness of the plant mapping to enable a reliable optimization. The idea is to combine the quadratic approximation approach used in derivative-free optimization techniques with the iterative gradient-modification optimization scheme. The convergence of the scheme is analyzed. Simulation studies for the optimization of a ten-variable synthetic example and a reactor benchmark problem with considerable plant-model mismatch show its promising performance.
|Highlights||• New optimization scheme targeting at economic process operations. • Combine modifier adaptation with quadratic approximation to handle uncertainties. • Quality-based optimization switching enables reliable and efficient convergence.|
Professor Sebastian Engell and the employees of the DYN group, Radoslav Paulen, Anwesh Reddy Gottu Mukkula, Lukas Samuel Maxeiner, Simon Wenzel, Reinaldo HernandezSankaranarayanan Subramanian and Weihua Gao, participated at the 26th European Symposium on Computer-Aided Process Engineering (ESCAPE) in Portorož, Slovenia from 12th to 15th June 2016.
Talks from DYN group at the conference:
S. Wenzel, R. Paulen, S. Krämer, B. Beisheim and S. Engell: Price Adjustment in Price-based Coordination Using Quadratic Approximation
Weihua Gao and Sebastian Engell: Using Transient Measurements in Iterative Steady-State Optimizing Control
Hubert Hadera, Rachid Labrik, Juha Mäntysaari, Guido Sand, Iiro Harjunkoski, Sebastian Engell: Integration of Energy-cost Optimization and Production Scheduling Using Multiparametric Programming
Fawad Shamim, Reinaldo Hernández,Radoslav Paulen and Sebastian Engell: A hierarchical coordination approach to the optimal operation of a sugar crystallization process
Lukas Samuel Maxeiner and Sebastian Engell: Distributed minimum batch time optimization for batch reactors with shared resources
Anwesh Reddy Gottu Mukkula and Radoslav Paulen: Optimal dynamic experiment design for guaranteed parameter estimation
Posters from DYN group at the conference:
Reinaldo Hernández and Sebastian Engell: Modelling and iterative Real-time Optimization of a homogeneously catalyzed hydroformylation process
Maren Urselmann, Tim Janus, Christophe Foussette, Stephen Tlatlik, Axel Gottschalk, Michael T. M. Emmerich, Thomas Bäck and S. Engell: Derivative-Free Chemical Process Synthesis by Memetic Algorithms Coupled to Aspen Plus Process Models
A. Sharma, M. Jelemenský, R. Paulen and M. Fikar: Estimation of membrane fouling parameters for concentrating lactose using nanofiltration
Professor Sebastian Engell and the employees of the DYN group, Reza Hashemi, Radoslav Paulen, Sergio Lucia (former employee, presently at OvGU Magdeburg and MIT Boston), Roberto Lemoine, Daniel Hasskerl, Sakthi Thangavel, Taher Sabry Ebrahim, Sankaranarayanan Subramanian and Lukas Hebing, participated at the 11th IFAC Symposium on Dynamics and Control of Process Systems, including Biosystems (DYCOPS-CAB 2016) in Trondheim, Norway from 6th to 8th June 2016.
Radoslav Paulen and Sebastian Engell co-organized a pre-conference workshop "Making model-based optimizing control an industrial reality" where the results of the MOBOCON project were presented. The workshop attracted 17 participants.
Talks from DYN group at the conference:
Taher Sabry ElSayed Gomaa, Ebrahim, Reinaldo Hernandez, Sankaranarayanan Subramanian, Marc Kalliski, Stefan Kraemer, Sebastian Engell: "NCO-Tracking with Changing Set of Active Constraints Using Multiple Solution Models"
Daniel Haßkerl, Momin Arshad, Reza Hashemi, Sankaranarayanan Subramanian, Sebastian Engell: "Simulation Study of the Particle Filter and the EKF for State Estimation of a Large-Scale DAE-System with Multi-Rate Sampling"
Lukas Hebing, Tobias Claus Neymann, Tobias Thüte, Alexander Jockwer, Sebastian Engell: "Efficient Generation of Models of Fed-Batch Fermentations for Process Design and Control"
Jose Roberto Lemoine-Nava Sebastian Walter, Stefan Körkel, Sebastian Engell: "Online Optimal Experiment Design: Reduction of the Number of Variables"
Sankaranarayanan Subramanian, Adeel Ahmad, Sebastian Engell: "Robust Control of a Supermarket Refrigeration System Using Multi-Stage NMPC"
Posters from DYN group at the conference:
Reza Hashemi, Sebastian Engell: "Effect of Sampling Rate on the Divergence of the Extended Kalman Filter for a Continuous Polymerization Reactor in Comparison with Particle Filtering"
Martin Jelemensky, Martin Klauco, Radoslav Paulen, Joost Lauwers, Filip Logist, Jan F.M. Van Impe, Miroslav Fikar: "Time-Optimal Control and Parameter Estimation of Diafiltration Processes in the Presence of Membrane Fouling"
The Chair of Process Dynamics and Operations co-organizes the workshop on Model-based Optimizing Control to take place on 9-10 June 2016 in Heidelberg. The aim of the workshop is to showcase the research results of the MOBOCON project to a wide international audience mainly from industry. The MOBOCON project is co-financed by the European Commission as ERC advanced grant awarded jointly to Prof. Engell, TU Dortmund and Prof. Bock, IWR Heidelberg. The participation in the workshop is free of charge. A link for registration as well as the program of the workshop can be found here.
Dr Weihua Gao participated at the 10th International Exhibition and Conference on Chemical Engineering and Biotechnology in Beijing, China from 9th to 12th May 2016. He presented his researcher with the talk:Weihua Gao, Reinaldo Hernandez, and Sebastian Engell: "Reliable and Efficient Strategy for Real-time Optimization of Processing Plants"
The project proposal CoPro – “Improved energy and resource efficiency by better coordination of production in the process industries”, led by Prof. Sebastian Engell (Chair of Process Dynamics and Operations http://www.dyn.bci.tu-dortmund.de/en in the Faculty of Biochemical and Chemical Engineering of TU Dortmund), has been evaluated as excellent by independent experts within the SPIRE call of HORIZON 2020. The aim of the project is to develop software for process control as well as for optimal planning and control of factories, industrial plants and parks at dynamically changing market conditions. The CoPro consortium consists of 17 partner institutions from 8 countries and will receive funding of about 6 million € for a period of 3.5 years; 0.9 million € go to TU Dortmund. Prof. Sebastian Engell will coordinate the project. We congratulate him on the success! More info.
As part of the PSE group work, the group supervised by the DYN chair presented their results at our industrial partner SOLVAY in Paris. In the SOLVAY research and development center, the group discussed their work with the SOLVAY experts and gained an insight into polymer preparation and analysis. The topic of the group work was “Process Design of a Production Plant for Acrylamide/AMPS (2-Acrylamido-2-Methylpropanesulfonic acid) Copolymer”.
PhD position in ‘energy-aware operation taking account of stress on equipment’ within the Horizon 2020 Marie Skłodowska-Curie Action PRONTO - PROcess NeTwork Optimization for efficient and sustainable operation of Europe’s process industries taking machinery condition and process performance into account. More information can be found here.
Prof. Sebastian Engell and the research associates Corina Nentwich, Simon Wenzel, Alexandru Tatulea-Codrean and Jochen Steimel participated at the PAAT 2015 in Bruchsal, Germany from the 16th to 17th November, 2015. The chair contributed with three oral presentations and a poster.
C. Nentwich, J. Steimel, S. Engell. “Datenbasierte Modelle zur Prozesssimulation und Optimierung von Verfahren in der frühen Entwicklungsphase“
S. Wenzel, W. Gao, S. Engell. “Ein neues Verfahren zur iterativen Betriebspunktoptimierung“
J. Steimel, S. Engell. “Modellgestützte Bewertung von Prozessalternativen für integrierte Reaktions- und Separationsprozesse unter Unsicherheit“
A. Tatulea-Codrean, S. Lucia, S. Engell. “DO-MPC: A software platform for optimization, estimation and simulation of systems under uncertainty. Real plant application and test cases”
15 PhD positions are available in the Horizon 2020 Marie Skłodowska-Curie Innovative Training Networks and European Training Networks (ITN-ETN) programme oCPS - Platform-aware Model-driven Optimization of Cyber-Physical Systems, at the Chair of Process Dynamics and Operations, TU Dortmund and academic and industrial partners from the Netherlands, Germany, Sweden and Italy. More information can be found here.
Professor Engell received an award, as a member of the author team, for the best paper appearing in journal Computers & Chemical Engineering in 2014. The Editorial Advisory Board of Computers & Chemical Engineering has assessed the papers published in 2014 in a three-stage process of nomination, critical evaluation, and voting. The 2014 Best Paper of the Year Award goes to:
Iiro Harjunkoski, Christos T. Maravelias, Peter Bongers, Pedro M. Castro, Sebastian Engell, Ignacio E. Grossmann, John Hooker, Carlos Méndez, Guido Sand, John Wassick. "Scope for Industrial Applications of Production Scheduling Models and Solution Methods" Volume 62, 5 March 2014, Pages 161-193.The paper is available for the free download.
Weihua Gao, Roberto Lemoine and Radoslav Paulen participated at the HCO Challenge Workshop Parameter and State Estimation, Methods - Software - Applications in Heidelberg, Germany from 10th to 11th November 2015. The chair was present with following contributions:
Roberto Lemoine "Challenges in the Online Model Adaptation of the Simulated Moving Bed Process"
Radoslav Paulen "Optimal Design of Dynamic Experiments for Guaranteed Parameter Estimation"
Professor Sebastian Engell und the research associates, Marc Kalliski, Simon Wenzel and Fabian Schweers, participated at the NAMUR – Hauptsitzung, Interessengemeinschaft Automatisierungstechnik der Prozessindustrie e.V., 2015 in Bad Neuenahr, Germany from 5th to 6th November 2015. The chair was present with following lecture:Marc Kalliski and Benedikt Beisheim. „Nutzung von Echtzeit Ressourceneffizienz-Indikatoren zur nachhaltigeren Anlagenfahrweise - Visualisierung, Operator Advisory und Decision Support“
Professor Sebastian Engell and the research associates, Marc Kalliski and Jochen Steimel, participated at the 10th European Congress of Chemical Engeineering in Nice, France from 27th September to 1st October 2015. The chair was present with two keynote lectures and two regular lectures.
M. Urselmann, C. Foussette, T. Janus, S. Tlatlik, M.-T.-M. Emmerich, A. Gottschalk, T. Bäck, S. Engell. "Design optimization of chemical processes by a memetic algorithm coupled to a commercial flowsheet simulator"
M. Kalliski, D. Krahé, N. Melchert, S. Engell. "Real-time resource efficiency indicators for monitoring and optimization of batch-processing plants"
J. Steimel, A. Tebbe, S. Engell. "A framework for cost-driven Design of chemical processes in early phases of process development"
B. Beisheim, D. Krahé, S. Kraemer. "Optimized cooling tower operation based upon simple physical models"
Dr.-Ing. Sergio Lucia, former employee of the Chair of Process Dynamics an Operations, has received the VAA-Award for an "outstanding Dissertation in the fields of the chemical-pharmaceutical science, and process and chemical engineering". Dr. Lucia obtained the award for his Dissertation on the topic "Robust Multi-stage Nonlinear Model Predictive Control", which was carried out under the supervision of Prof. Sebastian Engell. Numerous guests from industry, science and politics attended the award ceremony, which took place on the 13rd of October 2015 at the Berlin-Brandenburg Academy of Sciences.
Photo: Jens Gyarmati - VAA
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