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American control Conference (ACC)

作者： Laszlo Palkovics Peter Gaspar Jozsef Bokor Department of Road Vehicles Technical University of Budapest Budapest Hungary System and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The purpose of the paper is to study the design of the active wheel suspension system. The goal of the control design is the disturbance attenuation with respect to the road disturbances when some of the physical parameters of the system are uncertain. On the basis of a linear quarter-car model the tire stiffness and suspension stiffness are assummed to be uncertain. In this paper the authors deal with some new robust design methods. They examine the applicability of H ∞ control in case of the active suspension system using a quarter-car model. The problem is solved as a direct state-feedback H ∞ control problem and in case of structured uncertainties as an RLQR (Robust LQR) design task. On the basis of combination of these two methods new procedure is proposed.

关键词： Uncertainty control systems Actuators Wheels control design Robustness Vehicle dynamics Vehicles control system synthesis Tiles

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Modeling Time Varying System Perturbations: Application to Robust Change Detection and Identification

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IFAC Proceedings Volumes 1993年第2期26卷 519-522页

作者： L. Keviczky J. Bokor F. Szigeti A. Edelmayer Systems and Control Laboratory Computer and Automation Institute Hungarian Academy of Sciences H-1518 Budapest XI Kendeu. 13-17. P.D. Box 63 Hungary Department of Applied Analysis. Eötvös Loránd University H-1062 Budapest Múzeum krt. 6 Hungary

This paper discusses the problem of modeling time varying system perturbations and its application to observer-based detection filter design in uncertain linear systems. Robustness issues with respect to structured time varying system perturbations are considered. Our basic contribution is that applying differential algebraic methods and matrix lie-algebra in describing the effect of them varying system perturbation, it is possible to construct an extended linear time invariant(LTI) system and associated observer such that the solution of the design problem can be performed using algebraic methods and geometric concepts similar to the case of time invariant situations. At the same time the filter can be made robust with respect to these perturbations.

关键词： controllability Detection filters Differnttial algebra Time-varying systms Matrix Lie-algebra Robust detection filtter design

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An approach to the direct analysis of transient stability

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European Transactions on Electrical Power 1993年第3期3卷 241-248页

作者： Djukanovic, M.B. Sobajic, D.J. Pao, Y.‐H. Miodrag B. Djukanovic (1959) received his B.S. M.Sc. and Ph.D. degrees in Electrical Engineering from the University of Belgrade/Yugoslavia in 1982 1985 and 1992 respectively specializing in electric power systems. In 1984 he joined the Electrical Engineering Institute “Nikola Tesla” in Belgrade where he was working on the scientific studies in the field of power systems planning operation and control. In 1985 and 1990 he was appointed as a research scholar at the Royal Institute of Technology Stockholm and Case Western Reserve University Cleveland Ohio. His major in- terests are in the area of power system analysis steady-state and dynamic security and application of neural networks in electric power systems. (Electrical Engineering Institute “Nicola Tesla” ul. Koste Glavinica 8A YU-11000 Belgrad T +3811/2351-619 Fax + 3811/2351-823) Dejan J. Sobajic (1949) received the B.S.E.E. and the M.S.E.E. degrees from the University of Belgrade/Yugoslavia in 1972 and 1976 respectively and the Ph.D. degree from Case Western Reserve University Cleveland Ohio in 1988. At present he is with the Department of Electrical Engineering and Applied Physics Case Western Reserve University Cleveland. He is also the Engineering Manager of A1 WARE Inc. Cleveland. His current research interests include power system operation and control neuralnet systems and adaptive control. He is a member of the IEEE Task Force on Neural-Network Applications in Power Systems and of the IEEE Intelligent Controls Committee. He is the Chairman of the International Neural-Networks Society Special Interest Group on Power Engineering. (Case Western Reserve University Department of Electrial Engineering and Computer Sciences Glennan Building Ohio 44 106 USA T + 1216/421-2380 Fax +1216/368-8776) Yoh-Han Pao (1922) has been a Professor of Electrical Engineering and Computer Science at Case Westem Reserve University (CWRU) Cleveland Ohio since 1967. He has served as chairman of the University's Electrical Engineering Department

The Transient Energy Function (TEF) method has been intensely investigated over the last decade as a reliable and accurate tool for transient stability assessment of multimachine power systems. In this paper we propose the Potential Energy Boundary Surface (PEBS) based method for direct analysis of transient stability. The critical value of transient energy and the Critical Clearing Time (T_CCT) are evaluated without the need for successive calculation and memorization of the system kinetic and potential energy values along the sustained fault trajectory. The method is used for determination of output features in the training phase of the neural‐net based transient security assessment. The proposed approach is tested on the well‐known ten‐generator New England test system demonstrating the validity and accuracy of obtained results. Copyright © 1993 John Wiley & Sons, Ltd.

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HIERARCHICALLY INTELLIGENT control FOR INDUSTRIAL BOILER

HIERARCHICALLY INTELLIGENT CONTROL FOR INDUSTRIAL BOILER

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1992 IEEE INTERNATIONAL SYMP ON INTELLIGENT control

作者： GUO, C SUN, ZQ ZHU, SL FU, GY Department of Computer Science and Auto-Control Dalian Maritime University Dalian China Department of Computer Science and Engineering Tsinghua University Beijing China Institute of Automation Dalian Maritime University Dalian China

ISBN: (纸本)0780305469

Taking an industrial boiler as the controlled plant, the authors present a hierarchical intelligent control structure and algorithms for expert control, multimode control and self-tuning PID control. This hybrid controller adjusts its structure to maintain good performance over a wide variation of plant operating conditions. The results of digital and hybrid simulation as well as industrial field testing show that a hierarchical scheme which adopts different control algorithms based on the extent of deviation, incremental deviation and working condition is feasible. It is shown that the control of an industrial coal-fired boiler is improved by the intelligent hybrid controller.< >

关键词： Intelligent control Industrial control Boilers control systems Switches Automatic control Electrical equipment industry Three-term control Process control Expert systems

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A Design and Implementation of a Combustion controller in Microcomputer-based Multiloop controller MMC-90

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IFAC Proceedings Volumes 1992年第1期25卷 123-128页

作者： J. Cretnik J. Petrovčič A. Bitenc Department of Computer Automation and Control J. Stefan Institute Ljubljana Slovenia

The J. Stefan Institute in Ljubljana has developed a microcomputer-based multiloop controller MMC—90, which is, on the one hand, aimed at scientific research work, i.e. the study of the most modern techniques of control and, on the other hand, aimed at solving actual industrial problems. This paper presents an original CACE approach used for the design and implementation of a combustion controller with MMC-90. The control structure was first designed and simulated using the CACSD program package ANA. Then, it was implemented in the MMC-90 and tested in a real-time hardware—in—the—loop mode. This control simulation is described and shown for the case of a medium-size industrial boiler (20 MW). The combustion was simulated on a PC and the combustion control was done by the MMC—90. The developed combustion control concept was also tested and later applied in the real plant. The improved combustion control on the steam boiler PK400 (PK401) at the chemical works Cinkarna Celje implemented with MMC-90 led to a 4 % fuel (heavy oil) savings.

关键词： Process models process control combustion simulation control system design microcomputer—based control control applications PID control

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Steam Consumption control System for Batch Pulp Cooking

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IFAC Proceedings Volumes 1992年第25期25卷 205-210页

作者： J. Petrovčič A. Bitenc S. Strmčnik Department oF Computer Automation and Control J. Stefan Institute Ljubljana Slovenia

In batch pulp cooking the heating steam is used only in some phases of the technological procedure. This causes very irregular total steam consumption. High steam flow-rate variations impose a high dynamic load at the steam generation plant which reduces the efficiency of the steam generation. In this contribution a system for steam consumption control is presented, which is based on the three multiloop microprocessorbased controllers. The implemented control structure consists of a set of temperature controllers, a set of “smooth”temperature set-point generators, a set of state-machine algorithms for sequential control, a steam distribution algorithm, a simple steam flow-rateestimation and a steam flow-rate controller. The control structure is simple enough to allow the implementation as a stand-alone small-size control system. The lowcost solution is provided also by elimination of the need for aseparate steam flow-rate measuring system for each digesterʼs heat exchanger. After the installation a reduction of 70% in steam flow-rate variance was measured. The reduction may be adjusted by the operator as a compromise between the acceptable dynamic loading of the steam boilerand the requested pulp production rate.

关键词： Flow control Microcomputer based control Pulp industry

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Robustness and Identification Issues in Horizon Predictive control With Application to a Binary Distillation Column

Robustness and Identification Issues in Horizon Predictive C...

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American control Conference (ACC)

作者： D.E. Rivera K.S. Jun E. Elisante V.E. Sater B. C. Horn Department of Chemical Bio and Materials Engineering and Control Systems Engineering Laboratory Computer-Integrated Manufacturing Systems Research Center Arizona State University Tempe AZ USA Honeywell Industrial Automation and Control Phoenix AZ USA

This paper analyzes the robustness properties and modeling requirements for model-predictive control via Horizon Predictive control (HPC). The theory of Structured Singular Values is used to determine optimal values for the correction horizon in HPC given user-provided uncertainty intervals and performance weights. Regarding system identification, control-relevant identification principles are used to provide guidelines for input signal design, prefiltered estimation, and uncertainty modeling. These results are tested experimentally using data from a methanol-isopropanol distillation column.

关键词： Robust control Predictive control Distillation equipment Predictive models Uncertainty System identification control system synthesis Guidelines Signal design Testing

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Estimation and control of the Kappa Number in a Pulp Cooking Process

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IFAC Proceedings Volumes 1991年第3期24卷 775-780页

作者： D. Juričić Department of Computer Automation and Control "“Jožef Stefan" Institute Jamova 39 61111 Ljubljana Yugoslavia

Proper selection of cooking times is one of the most important decision making tasks in batch pulp cooking. Duration of a batch depends on cooking conditions and must be chosen so that the Kappa number - a measure for pulp quality - reaches the desired value at the end of the batch. Due to the lack of appropriate industrial sensors for on-line Kappa measurements, Kappa can be determined only after cooking is over by means of analysis in the laboratory. Therefore, a model based system is developed for on-line Kappa estimation and control. The very heart of the system represents the estimation algorithm based on non-linear optimization. It combines a special purpose routine for approximate (but fast) optimum search and Gauss—Newton method for "fine" optimization. This paper surveys some relevant properties of the scheme such as model simplification, "fine" optimization, analysis of identifiability conditions and related numerical problems. A minimum variance Kappa controller is treated as well. Efficiency of the proposed scheme is confirmed by means of the simulated examples and results of practical implementation.

关键词： Pulp industry optimization parameter estimation identifiability computer control

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Model based control of the kappa number in the pulp cooking process

Model based control of the kappa number in the pulp cooking ...

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Mediterranean Electrotechnical Conference (MELECON)

作者： D. Juricic Department of Computer Automation and Control Jožef Stefan Institute Ljubljana Slovenia

Due to the lack of appropriate industrial sensors for online Kappa measurements, Kappa can be determined only after a batch is over by means of analysis in the laboratory. In view of this, a model-based system is developed with the purpose of estimating and controlling Kappa online. A survey is presented of some relevant design issues such as model simplification, approximate parameter estimation, and minimum variance Kappa control. The efficiency of the proposed scheme is illustrated by means of the simulated examples and the results of practical implementation.< >

关键词： Parameter estimation Mathematical model Automatic control Industrial control Temperature Tellurium Optimization methods automation Pulp and paper industry Production

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In-circuit simulation of industrial processes with personal computers

In-circuit simulation of industrial processes with personal ...

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Mediterranean Electrotechnical Conference (MELECON)

作者： D. Pfannstiel J. Cretnik Department of Control Engineering Technical University of Darmstadt Darmstadt Germany Department of Computer Automation and Control Jozef Stefan Institute Ljubljana Slovenia

The principle of in-circuit simulation, with PCs is described and shown for two cases. In the first case, for oil-fired central heating with low power (

The principle of in-circuit simulation, with PCs is described and shown for two cases. In the first case, for oil-fired central heating with low power (<120 kW), the boiler- and the heat-temperature-control of the heating system are presented. The house and the heating system were simulated on a PC. In the second case, the combustion control of a medium-sized industrial boiler (20 MW) is presented. The combustion was simulated on a PC and the combustion control was accomplished by the MMC-90 microcomputer-based multiloop controller.< >

关键词： Computational modeling computer simulation computer industry Microcomputers control systems Combustion Testing Automatic control Electrical equipment industry Industrial control

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