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AUTOMATION OF CHEMICAL-PLANT MODELING

AUTOMATICA 1980年第6期16卷 649-661页

作者： AARNA, O Department of Automatic Control Tallinn Technical University Tallinn 200026

A unified approach to the steady state and dynamics modelling of chemical plants based on a partially explicit model is presented. Rational division of the functions between a human and a computer is discussed. Inner form of the model in a computer and algorithms of automatic solution planning are presented. General structure of the modelling package, automatic compilation of modelling programs and linearized models are also considered. Input language for describing plant models and problems solved using the latter are illustrated.

关键词： Chemical industry computer software control engineering computer applications graph theory linearisation techniques modelling

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CS2: Management and Optimisation of an Extensive High Pressure Gas Network

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IFAC Proceedings Volumes 1980年第9期13卷 63-71页

作者： W. Krull D. Herbst K. Homann E. Stromberg Vereinigte Elektrizitätswerke Westfalen AG Rheinlanddamm Dortmund Federal Republic of Germany

The remote control system of an extensive high-pressure gas network is discribed. Starting with the particularities of natural gas distribution, the hardware part of the process control computer is introduced. The need for an automatic control is made plain by discussing the various boundary conditions under which gas transport is done. Finally the software elemements of network control such as data transmission, real-time simulation, prognosis and prospective simulation are discussed with respect to special demands of the gas-industry.

关键词： control engineering computer applications natural gas technology optimisation numerical analysis centralised plant control

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Application of External Equivalents in the Case of Machine Outages in the Study System

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IFAC Proceedings Volumes 1980年第8期13卷 393-403页

作者： A.J. Calvaer P.L. Boulanger Department of Electrical Engineering University of Liège Liège Belgium

The problem of security assessrrent of each sub-system of an extended interconnected power system needs, for each sub-system, the knowledge of equivalents related to the behaviour of the other partners. The particular topic of this paper is to analyze the reactive power behaviour of an external system when a large disturbance of active power (loss of a large generator f. i.) occurs in the study system. An extended Norton theorem is derived; it shows that a sensitivity matrix relating the voltage variations to the reactive current variations on the ties is only a part of a suitable external equivalent. The results given by using only this matrix are thus approximate. Nevertheless, after L.F.C. actuation this approximation seems to be perfectly acceptable, particularly if the a.v.r. gains are sufficiently high.

关键词： control engineering computer applications large scale systems linearisation techniques modelling on line operation power system control power transmission external equivalents reactive power control security assessment

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G7.2: Design Considerations for Microprocessor Based controllers

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IFAC Proceedings Volumes 1980年第9期13卷 451-456页

作者： A.H. Glattfelder F. Huguenin W. Schaufelberger Escher Wyss A G. Zürich Switzerland Swiss Federal Institute of Technology Zürich Switzerland

A top-down design procedure for the early stages of a microprocessor based controller design problem is presented in this paper. Problem definition and preliminary design are treated. Information structure, algorithms, software and hardware have to be evaluated, assessed and chosen in this phase. Two examples demonstrate how the process can be applied to actual problems

关键词： computer control computer selection and evaluation control engineering computer applications Digital control Industrial control Microprocessors Process control Systems engineering

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An electrode controller for Submerged Arc Furnaces

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IFAC Proceedings Volumes 1980年第7期13卷 611-621页

作者： I.J. Barker Instruments Division National Institute for Metallurgy Private Bag X3015 Randburg 2125 South Africa

A new type of automatic electrode controller for submerged-arc furnaces has been developed by the National Institute for Metallurgy (NIM), in response to the need for some means of overcoming the problems that are experienced on large submerged-arc turnaces. This paper deals with the development of the algorithm for the prototype unit. The exact nature of the problem with conventional electrode control is explained, and the operation of the prototype unit is described.

关键词： control engineering computer applications Ferro-alloys Steel industry Electrodes Process control Microprocessors Optimal control

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Multivariable control of an Industrial Grinding Circuit

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IFAC Proceedings Volumes 1980年第7期13卷 311-322页

作者： D.G. Hulbert J. Koudstaal M. Braae G.I. Gossman National Institute for Metallurgy Private Bag X3015 Randburg 2125 South Africa Council for Scientific and Industrial Research P O Box 395 Pretoria 0001 South Africa Gold Fields of South Africa Limited P.O. Box 1167 Johannesburg 2000 South Africa

This paper describes the phases of identificatio a multivariable controller for use in an industrial plant, of the important output variables of a grinding circuit is hampered by the interaction between different variables, a generally not possible for these interactions to be elimin tional controllers. A pilot-plant study of a one-stage grinding circuit has sh control of a complex industrial circuit is feasible with a controller designed by the Inverse Nyquist Array method. This conclusion is further supported by a preliminary study carried out on tion of an industrial milling circuit in a gold extraction. The grinding circuit of the industrial plant, which consis mill and two pebble mills with classification by hydrocyclones, was fully instrumented, and a process-control computer was installed. Open-loop tests were carried out on the plant and the resu derivation of a dynamic model in the form of a matrix of transfer fuctions. The model was used to design a multivariable controller for the griding circuit.

关键词： Grinding Multivariable control systems Inverse Nyquist Array control engineering computer applications

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G10.1 : Industrial Experience with Process control Programming Language Pearl

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IFAC Proceedings Volumes 1980年第9期13卷 505-509页

作者： T. Martin Kernforschungszentrum Karlsruhe GmbH Projekt PDV Postfach 3640 D-7500 Karlsruhe 1 Federal Republic of Germany

PEARL is a user-oriented high level programming language designed for a wide spectrum of process control applications. A short anwser is tried to the question of how PEARL relates to the various other types of programming languages available on process computers. PEARL still seems to be the only one with true embedded realtime features high enough in level to grant economical process control for industrial applications Application experience is then described by reporting about four different control systems programmed with PEARL which control four different types of technical processes: continuous, batch, discrete particle, and sequential processes. All projects were successful. This suggests that PEARL truly can be called an application independent realtime programming language Finally, some facts about the availability of PEARL are given. PEARL is standardized and available from manufacturers on an international basis. Recently a user organization - the PEARL Association (or PEARL Verein in German) - was founded which will be providing interested parties with services like information on experiences with PEARL, newsletter, and exchange of programs

关键词： control engineering computer applications programming languages realtime programming languages PEARL process control power control chemical variables control manufacturing processes materials handling standardisation

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Microprocessor control of Main Pumping Stations in the Hungarian Coal Mines

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IFAC Proceedings Volumes 1980年第7期13卷 207-211页

作者： K.K. Halmos Central Institute for the Development of Mining Budapest Hungary

Hungarian coal nines have to pump out large water quantities. Dewatering affords reliable control equipment, which is simple and can meet the changing requirements of mines. Until now IC built control equipment has be... 详细信息

关键词： control engineering computer applications Micro-processors Mining

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Artificial Intelligence, Automatic control and Development

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IFAC Proceedings Volumes 1980年第11期13卷 xxxvii-xliii页

作者： T. Vámos Computer and Automation Institute Hungarian Academy of Sciences 1111 Budapest XI. Kende u. 13/17 Hungary

A survey is given on new impacts of artificial intelligence on automatic control. Artificial intelligence offers its tools to automatic control at two decision points: input and control. Visual, voice and information pattern as inputs to control systems are treated, especially for quality control, medical applications. A glimpse on expert systems illuminates the possibilities of automated dispatcher and other decision making. New algorithms solving very complex problems offer several possibilities. A short report on the intelligent robot program of the author's group is given and as a conclusion some considerations on artificial intelligence, control and development.

关键词： Artificial intelligence assembling automatic testing biomedical control engineering computer applications human factors man-machine systems pattern recognition robots

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Decentralised and Centralised Automatic Generation control — A Multi-Variable Servomechanism Approach

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IFAC Proceedings Volumes 1980年第8期13卷 xxxiii-xlii页

作者： S.C.A. Poon F.J. Evans H.R. Outhred D.J. Clements The Electricity Commission of NSW Sydney Australia The University of New South Wales Sydney Australia Department of Electric Power Engineering The University of New South Wales Sydney Australia Department of Systems and Control Engineering The University of New South Wales Sydney Australia

The multi-input multi-output servomechanism concept is applied to conventional tie line bias control (TBC) as an example of decentralised automatic generation control (AGC); to a centralised form of TBC and to another centralised AGC scheme. The tracking properties of the AGC servocontroller and decoupling from higher levels of control are explored together with improved stability possibilities in the case of centralised coordination.

关键词： Load control frequency control power system control automatic generation control multivariable control system optimisation non-linear programming on-line operation control engineering computer applications

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