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Model Predictive controller for Integrated Wastewater Treatment System

IFAC Proceedings Volumes 2004年第11期37卷 579-584页

作者： Tomasz Gminski Mietek A. Brdys Mkhal Grochowski Marcin Drewa Department of Automatic Control Gdansk University of Technology ul. G.Narutowicza 11/12 80 9 52 Gdansk Poland tel. (048) (58) 342 29 04 School of Engineering Department of Electronic Electrical and Computer Engineering The University of Birmingham Birmingham B15 2TT UK tel. +44 (0) 121 4144354 fax: +44 (0)121 414 4291

Optimising control of wastewater treatment systems (WWTS), allowing for cost savings while fulfilling the effluent discharge limits over long period requires application of advanced control techniques. Model Predictive control (MPC) is a very suitable control technology for a synthesis such a truly multivariable controller that can handle constraints and accommodate model-based knowledge combined with hard measurements. A hierarchical architecture is used to structure the MPC controller into the functional Supervisory, Optimising and Follow up levels. The Optimising control Level is further decomposed into three layers operating in different time scales: slow, medium and fast. The paper considers MPC controller operating in medium time scale. As it is impossible to efficiently control the plant under all possible influent conditions, three dedicated control strategies were designed. The controller performance was validated by simulation based on Kartuzy WWTS data records. Recently developed mechanism for soft switching between different MPC control strategies was used in the simulations.

关键词： hierarchical structures predictive control optimal control waste treatment

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Low order sampled data H/sub /spl infin// control using the delta operator and LMIs

Low order sampled data H/sub /spl infin// control using the ...

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IEEE Conference on Decision and control

作者： B. Lennartson R. Middleton A.-K. Christiansson T. McKelvey Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Complex Dynamic Systems & Control School of Electrical Engineering & Computer Science University of Newcastle Callaghan NSW Australia University of Trollhättan/Uddevalla Trollhattan Sweden Department of Signals and Systems Chalmers University of Technology Goteborg Sweden

A procedure for H/sub /spl infin// optimization of low order controllers for discrete-time and sampled-data systems is presented in this paper. Generally, low order H/sub /spl infin// controllers may be achieved by solving bilinear matrix inequalities (BMIs). In this paper an iterative alternation between two LMIs gives a suboptimal solution. To avoid local minima in this search the initial controller is obtained by a frequency weighted controller reduction scheme, where the closed loop properties of a full order controller is taken into account. A minimal number of parameters in the state space realization of the controller also reduces the complexity and improves numerical robustness. The complete presentation is based on delta operator models, which shows a close relationship between the continuous- and discrete-time solutions. The sensitivity of the ordinary discrete-time shift operator LMI formulation to small sampling periods is also analyzed.

关键词： control systems Linear matrix inequalities Sampling methods automatic control Frequency Weight control Robust control Signal processing State-space methods Robustness

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A new training simulator for improved voltage control of the Hydro-Quebec system

A new training simulator for improved voltage control of the...

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IEEE PES Power Systems Conference and Exposition, PSCE

作者： T. Van Cutsem G. Hasse C. Moors S. Guillon R. Mailhot Department of Electrical Engineering and Computer Science Montefiore Institute University of Liège Liege Belgium Universite de Liege Liege BE Operational Planning Department of the TransEnergie division of Hydro-Québec Canada Hydro-Québec control center Montreal QUE Canada

This paper reports on the development of a training simulator focusing on voltage control and stability. It has been derived from a quasisteady-state simulation software already used and validated in planning and operational planning studies. The computational engine has been provided with a user interface built on the client-server architecture, allowing the simulator to run on a network of PCs in a very flexible way. New displays can be set up easily and quickly. This tool is presently used by Hydro-Quebec to improve the operator's ability to control transmission voltages. Other features, uses and benefits are reported.

关键词： Voltage control Computational modeling Stability computer interfaces computer networks Engines User interfaces computer architecture Personal communication networks Displays

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A novel three-phase line-interactive UPS system with parallel-series active power-line conditioning capabilities using AC line reactor

A novel three-phase line-interactive UPS system with paralle...

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Annual Conference of Industrial Electronics Society

作者： Jun-Keun Ji Jang-Hwan Kim Seung-Ki Sui Hyo-sung Kim Division of Information & Technology Engineering Soonchunhyang University Asan Gyeongnam South Korea Division of Information & Technology Engineering Soonchunhyang University Asan-Si Chungnam Korea School of Electrical Engineering and Computer Science Seoul National University Seoul Korea Department of Control & Measurement Engineering Cheonan National Technical College Cheonan Chungnam Korea

ISBN: (纸本)0780387309

In this paper a novel three-phase line-interactive UPS system with parallel-series active power-line conditioning capability using AC line reactor and two four-leg voltage source converter (VSC) is proposed. The four-leg VSC can use the DC-link voltage effectively by the 3-D SVPWM method. Hence the DC battery voltage can be reduced by 15% in comparison to that of the conventional line-interactive UPS system. The parallel inverter operating as a shunt active filter is a controlled voltage source and controls the three-phase line voltage independently in order to control the source current. It eliminates the neutral line current and the active ripple power of the source side using the dqo transformation so that unity power factor and the sinusoidal source current can be achieved even though both the source and the load voltages have zero sequence components. The series inverter operating as dynamic voltage restorer (DVR) compensates the load voltage and allows it to be balanced and harmonic-free. Both of the series and shunt inverters always act as independently controllable voltage sources, so that the three-phase output voltage can show a seamless transition to the backup mode. The feasibility of the proposed UPS system has been investigated and verified through experimental results.

关键词： Uninterruptible power systems Inductors Voltage control Inverters Converters Power conversion Shunt (electrical) Space vector pulse width modulation Batteries Active filters

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Experimental evaluation of a new repetitive control algorithm on a non-minimum phase spring-mass-damper system

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IFAC Proceedings Volumes 2004年第12期37卷 681-686页

作者： C.T. Freeman J.J. Hätönen P.L. Lewin D.H. Owens E. Rogers School of Electronics and Computer Science University of Southampton University Road Southampton SO17 1BJ United Kingdom Fax: +44(0)2380 593709 Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Systems Engineering Laboratory The University of Oulu P.O. BOX 4300 FIN-90014 University of Oulu Finland

Recently, a novel optimality based Repetitive control algorithm was proposed in (Hätönen et al. , 2003). According to the convergence analysis carried out in that paper, the algorithm will result in asymptotic convergence for an arbitrary discrete-time LTI plant and a T -periodic reference. However, the performance of the algorithm was tested only using simulation studies. In order to rigorously test how the algorithm performs with real systems, in this paper the algorithm is implemented on a non-minimum phase spring-mass-damper system. The results are very satisfactory, because the algorithm results in near perfect tracking with this rather demanding plant type.

关键词： Repetitive control Optimal control Polynomial Systems Theory Non-Minimum Phase Systems

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Improved Operation of Pusher Reheating Furnaces by Using a Supervisory-Plus-Regulatory control

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IFAC Proceedings Volumes 2004年第5期37卷 209-214页

作者： Zh.A. Icev M.J. Stankovski T.D. Kolemishevska-Gugulovskal J. Zhao G.M. Dimirovski SS Cyril and Methodius University. Faculty of Electrical Engineering ASE Institute P.O.B. 574 MK-JOOO Skopje Republic of Macedonia Northeastern University. School of Information Science and Engineering Institute of Control Theory Shenyang Liaoning 110004 P.R. of China Dogus University Faculty of Engineering Computer Engineering Department Acibadem Zeamet Sk. 21 Kadikoy TR-34722 Istanbul Republic of Turkey

A systems engineering approach to integrated control and supervision for applications to industrial multi-zone furnaces has been elaborated and tested in a case study of three-zone 25 MW RZS pusher furnace at Skopje Steelworks. The integrated control and supervision design is based on combined use of general predictive control optimization of set-points, at the upper level, and steady-state decoupling classical two-term laws, at the lower executive control level. For practical engineering and maintenance reasons, digital implementations are sought within standard computer process control platform.

关键词： Generalized predictive control integrated control and supervision optimization time-delay processes set-point control

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Optimizing Supervision and control for Industrial Furnaces: Predictive control Based Design

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IFAC Proceedings Volumes 2004年第19期37卷 17-28页

作者： Georgi M. Dimirovski A. Talha Dinibütün Miomir K. Vukobratovic J. Zhao SS Cyril and Methodius University Faculty of Electrical Engineering MK-1000 Skopje Republic of Macedonia Dogus University Computer Engineering Department Faculty of Engineering Acibadem Zeamet Sk. 21 Kadikoy TR-34722 Istanbul Turkey Institute “Mihailo Pupin” Centre of Robotics and Flexible Automation 11000 Belgrade Serbia and Montenegro Northeastern University School of Information Science and Engineering Institute of Control Theory Shenyang Liaoning 110004 P.R. of China

A systems re-engineering technique to integrated control and supervision for applications to industrial multi-zone furnaces has been elaborated by using known theories on generalized predictive control and nonlinear programming. This paper presents the derivation of optimizing equations and inequalities. The design is based on the use of general predictive control to provide optimized set-points under the presumption a well designed regulatory control was implemented at the executive level. Digital implementation of control functions are sought within standard computer process control platform for practical engineering and maintenance reasons.

关键词： Complex time-delay processes generalized predictive control integrated control and supervision optimization set-point control

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Practical implementation of a model inverse optimal iterative learning controller

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IFAC Proceedings Volumes 2004年第12期37卷 687-692页

作者： J.D. Ratcliffe T.J. Harte J.J. Hätönen P.L. Lewin E. Rogers D.H. Owens School of Electronics and Computer Science University of Southampton University Road Southampton SO17 1BJ United Kingdom Fax: +44 (0)23 8059 3709 Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Systems Engineering Laboratory The University of Oulu P.O. BOX 4300 FIN-90014 University of Oulu Finland

In this paper, a new model inverse optimal iterative learning control algorithm is practically implemented on an industrial gantry robot. The algorithm has only one tuning parameter which can be adjusted to provide a balance between convergence speed and robustness. Results show that the algorithm is capable of learning the required trajectory in very few iterations. However at this convergence rate the lack of robustness is a major issue. Appropriate use of the tuning parameter is shown to greatly increase the algorithm robustness as demonstrated by tests which successfully reach 600 iterations.

关键词： Learning control Iterative methods Optimal control

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Modeling Demand for Inventory Management of Slow-Moving Items in Case of Reporting Errors

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IFAC Proceedings Volumes 2004年第4期37卷 27-32页

作者： Alexandre Dolgui Anatoly Pashkevich Maxim Pashkevich Scientific Methods for Industrial Management Dept. (MSGI) Industrial Engineering and Computer Sciences Center (G2I) Ecole de Mines de Saint Etienne 158 Cours Fauriel 42023 Saint Etienne France Robotic Laboratory Department of Automatic Control Belarusian State University of Informatics and Radioelectronics 6 P.Brovka St. Minsk 220027 Belarus Department of Mathematical Modeling and Data Analysis Faculty of Applied Mathematics and Computer Science Belarusian State University Skarina Av. 4 Minsk 220050 Belarus

The paper is devoted to the problem of modeling demand for inventory management of slow-moving items in the case of reporting errors. It is proposed a generalization of the beta-binomial demand model that takes into account possible reporting errors in the learning sample. For the new model, there are developed identification and forecasting algorithms that provide consistent estimators of the model parameters and mean square optimal forecasts. The efficiency of the proposed approach is illustrated by an application example for slow-moving car parts.

关键词： inventory control error correction statistical inference parameter estimation prediction methods

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Forming of tubes and bars of alumina/LY12 composites by liquid extrusion process

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中国有色金属学会会刊：英文版 2003年第4期13卷 803-808页

作者：齐乐华李贺军崔培玲史忠科 College of Mechanical and Electrical Engineering College of Materials Science and Engineering Department of Automatic Control

Tube and bar products of aluminum alloy composites reinforced by alumina short fiber were formed in a single process with liquid extrusion technology. The microstructure verifies that the reinforcing effect is obvious in the deformation direction since fibers are distributed along this direction, which is resulted from the flow and crystallization under pressure of liquid metal and large plastic deformation of solidified metal in the process. The interface between fiber and matrix belongs to mechanical bonding. The fractograph demonstrates ductile mode. Liquid extrusion process opens up a new way for fabricating tube, bar and shaped products.

关键词：铝基复合材料液体挤出成型管材棒材

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