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3-LEVEL HIERARCHICAL APPROACH TO THE JOINT PROBLEM OF SYSTEM-IDENTIFICATION AND OPTIMIZATION

IEE PROCEEDINGS-D control THEORY AND APPLICATIONS 1982年第5期129卷 163-166页

作者： FAWZY, AS HINTON, OR HANNA, FK UNIV KENT ELECTR LABSCANTERBURY CT2 7NTKENTENGLAND

The paper presents a three-level hierarchical approach for solving the joint problem of system identification and optimisation. It is then applied to a batch penicillin fermentation process using a microprocessor. Det... 详细信息

关键词： optimisation three-level hierarchical approach optimal control control engineering computing batch penicillin fermentation process Simulation, modelling and identification hierarchical systems Optimal control control technology and theory system identification control applications in other industries microprocessor system Industrial applications of IT Industrial processes identification process computer control

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SOME ASPECTS OF MULTILEVEL LOAD-FREQUENCY control OF A POWER SYSTEM

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IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION 1982年第6期129卷 290-294页

作者： PREMAKUMARAN, N PARTHASARATHY, K KHINCHA, HP CHIDAMBARA, MR INDIAN INST SCI SCH AUTOMAT BANGALORE 560012 KARNATAKA INDIA

The application of multilevel control strategies for load-frequency control of interconnected power systems is assuming importance. A large multiarea power system may be viewed as an interconnection of several lower-order subsystems, with possible change of interconnection pattern during operation. The solution of the control problem involves the design of a set of local optimal controllers for the individual areas, in a completely decentralised environment, plus a global controller to provide the corrective signal to account for interconnection effects. A global controller, based on the least-square-error principle suggested by Siljak and Sundareshan, has been applied for the LFC problem. A more recent work utilises certain possible beneficial aspects of interconnection to permit more desirable system performances. The paper reports the application of the latter strategy to LFC of a two-area power system. The power-system model studied includes the effects of excitation system and governor controls. A comparison of the two strategies is also made.

关键词： Frequency control Power system protection voltage control power system protection power system interconnection governor controls global controller interconnected power systems Voltage control control of electric power systems local optimal controllers multilevel load-frequency control Optimal control least-square-error principle Power system management, operation and economics optimal control power system control control engineering computing controllers controllers frequency control excitation system

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OPTIMIZATION OF DISCRETE-TYPE LOAD-FREQUENCY REGULATORS CONSIDERING GENERATION-RATE CONSTRAINTS

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IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION 1982年第6期129卷 285-289页

作者： HIYAMA, T Department of Electrical Engineering Kumamoto University Kumamoto Japan

In the paper a method of designing discrete-type load-frequency regulators of a two-area reheat-type thermal system with generation-rate constraints is presented. The construction of the regulators is based on the conventional tie-line bias control. The regulator parameters are optimised by minimisirig a discrete-type quadratic performance index with a term for presenting a generation-rate constraint. The optimisation of the parameters is achieved by using a Newton-Raphson iterative algorithm. The control effects by the proposed regulators are examined by digital simulations of the system. Furthermore, a suitable means for preventing excessive and unnecessary control action is also proposed considering the constraint.

关键词： Newton-Raphson iterative algorithm minimisation minimising voltage control Power engineering computing steam power stations digital simulations parameters are optimised two-area reheat-type thermal system Voltage control quadratic performance index control of electric power systems discrete systems discrete-type load-frequency regulators load regulation Power system management, operation and economics control of heat systems Discrete control systems control engineering computing iterative methods controllers tie-line bias control controllers Steam power stations and plants power station load digital simulation power stations generation-rate constraints

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DEMAND-ASSIGNED MULTIPLE-ACCESS SYSTEMS USING COLLISION-TYPE REQUEST CHANNELS - STABILITY AND DELAY CONSIDERATIONS

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IEE PROCEEDINGS-E COMPUTERS AND DIGITAL TECHNIQUES 1981年第1期128卷 37-43页

作者： RAPPAPORT, SS Department of Electrical Engineering State University of New York Stony Brook USA

Stability and delay characteristics are developed for a demand-assigned multiple-access (DAMA) scheme which employs multiple message channels and multiple collision-type request channels, and which is capable of high traffic capacity. Trade-offs among delay, stability, and bandwidth utilisation, are investigated using an approximate analysis based on expected value-performance measurements. It is shown that by operating only a few per cent below capacity a dramatic decrease in average delay is attainable while maintaining absolute stability. The scheme is particularly appropriate for single-channel-per-carrier applications with many low-duty-cycle users.

关键词： stability delay control engineering computing multiple message channels demand-assigned multiple-access computer networks digital control distributed processing multivariable control systems Computer networks and techniques collision-type request channels expected value-performance measurements

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SELF OPTIMIZING COMBUSTION control OF AN OIL-FIRED POWER-STATION BOILER

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IEE PROCEEDINGS-D control THEORY AND APPLICATIONS 1981年第2期128卷 50-55页

作者： JENKINS, PH WILLIAMS, AH CENT ELECT GENERATING BOARD DEPT SCI SERVBRISTOL BS13 8ANENGLAND

Failure to achieve satisfactory control of combustion conditions in an oil-fired boiler leads to undesirable chimney emissions; insufficient combustion air results in the production of black smoke, whereas white acidic smoke is produced by excessive amounts of combustion air. A control strategy has been developed which automatically optimises the combustion conditions by adjusting the air/fuel ratio to minimise a performance index calculated from measurements of combustion products. This control strategy has been implemented on a 100 MW power station boiler using a standard commercially manufactured process control *** well as describing the development work necessary, the paper outlines the engineering of the system and discusses some of the contractual arrangements adopted. This system has been in operation for over three years and has proved capable of tight control of combustion conditions even during rapid load changes. Undesirable chimney emissions have now been virtually eradicated. The success of this system has led to the decision to install similar controls on the 500 MW boilers at Pembroke Power Station.

关键词： combustion Self-adjusting control systems air/fuel ratio optimal control performance index control engineering computing Optimal control chimney emissions Power engineering computing process control computer self optimising combustion control self-adjusting systems oil-fired power station boiler 100 MW power station Steam power stations and plants power station computer control boilers control of heat systems

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COMMUNICATION REQUIREMENTS OF A DISTRIBUTED COMPUTER control-SYSTEM

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IEE PROCEEDINGS-E COMPUTERS AND DIGITAL TECHNIQUES 1981年第1期128卷 21-34页

作者： PRINCE, SM SLOMAN, MS Department of Computing & Control Imperial College London UK

The paper gives a tutorial exposition and discussion of the requirements that a distributed computer control system imposes on its internal communication system, and of the various ways in which this requirement can be met. The subject is considered under the following main headings: informationtransfer requirements, performance, reliability, environmental and safety considerations, physical configuration, and communication-system management. In a concluding Section the requirements of these communication systems and other serial communication systems are compared.

关键词： information-transfer requirements control engineering computing computer networks distributed processing safety internal communication system Computer networks and techniques reliability performance communication-system management process computer control distributed computer control system

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APL AND GRAPH-THEORY IN DYNAMIC-SYSTEMS ANALYSIS

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IEE PROCEEDINGS-D control THEORY AND APPLICATIONS 1981年第3期128卷 85-92页

作者： SCHIZAS, C EVANS, FJ Queen Mary College Deparment of Electrical & Electronic Engineering University of London London UK

It is demonstrated how well-established graph theoretic result can be exploited in the analysis of large-scale systems, and directed towards question of design such as controllability and stability. The generalised na... 详细信息

关键词： stability interactive language large-scale systems controllability control engineering computing dynamic systems analysis control system synthesis graph theory design APL Multivariable control systems control system analysis and synthesis methods Stability in control theory control system analysis computing

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MATHEMATICAL-MODEL OF SCENERY HOIST SYSTEM AT THE OLIVIER THEATER

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IEE PROCEEDINGS-E COMPUTERS AND DIGITAL TECHNIQUES 1980年第6期127卷 263-274页

作者： DAS, SK UNIV LONDON UNIV COLL DEPT COMP SCILONDON WC1E 6BTENGLAND

Theatres generally have a substantial number of hoists etc. for moving scenery during performances, but one never needs to use more than a proportion of them at any one time. The number of drive controllers provided can therefore be limited to the maximum number needed for simultaneous use, and these can be connected to the required set of hoists through a switching network. The paper gives an account of the design of the switching network developed for the Olivier Theatre, and of the algorithm which selects paths through this network during operational use. The algorithm is implemented on a minicomputer.

关键词： Materials handling equipment control applications to materials handling drive controllers control engineering computing hoists switching network controllers network sports and entertainment computerised control Olivier theatre controllers scenery hoist system minicomputer Materials handling and distribution

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MICROPROCESSOR-BASED ADAPTIVE WATER-TURBINE GOVERNOR

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IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION 1980年第6期127卷 360-369页

作者： FINDLAY, D DAVIE, H FOORD, TR MARSHALL, AG WINNING, DJ N SCOTLAND HYDRO ELECT BOARD EDINBURGH SCOTLAND

Conventional governors of water-turbine-generator sets can be set up to provide either stability when supplying an isolated load or rapid response when connected to a large, predominantly thermal, system. In the paper, an adaptive microprocessor-based governor is described which goes some way to satisfying both requirements. Results are given for tests on a 32.5 MW turbine generator.

关键词： stability 32.5 MW turbine generator control of hydraulic systems hydraulic turbines tests control engineering computing adaptive systems computerised control adaptive microprocessor based governor water turbine Hydroelectric power stations and plants adaptive control

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ELECTRICAL INTERLOCK DESIGN FOR COMPLEX HIGH-POWER SWITCHING NETWORKS

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1979年第2期126卷 152-158页

作者： LIDGATE, D AITCHISON, PW ACOCK, D CENT ELECTR GENERATING BOARD DIV GENERAT DEV & CONSTRUCTBARNWOODNJ

The paper reviews the derivation of interlock logic and the resultant interlock circuits for conventional double-busbar substations. These methods are then shown to be inadequate when the number of operating constraints on each switch and the degree of network interconnection are increased. A new method of deriving the interlock logic that can be converted directly into hard-wired form is then presented. The application of this method to the Dinorwic pumped storage scheme is given as an example. The ways by which conflicts between safety and operating requirements can be overcome are then described. Finally, the methods by which such complex interlock logic may be checked are discussed and examples given of the application of decision tables to this task.

关键词： switching substations power system protection conventional double busbar substations interlock design complex high power switching networks Substations Power engineering computing Switchgear control engineering computing control of electric power systems Electric actuators and final control equipment busbars network interconnection safety pumped storage scheme interlock circuits interlock logic power system computer control Power system protection operating requirements

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