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ELECTRICAL INTERLOCK DESIGN FOR COMPLEX HIGH-POWER SWITCHING NETWORKS

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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SELF-TUNING control

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1979年第6期126卷 633-640页

作者： CLARKE, DW GAWTHROP, PJ Department of Engineering Science University of Oxford Oxford UK

Self tuning is an important new branch of control which is attracting increasing theoretical and practical interest. The objective of self tuning is to control systems with unknown constant or slowly varying parameters, so theoretical interest is concerned with the stability, performance and convergence of the recursive algorithms involved, while practical interest derives from its potential as a simple controller commissioning tool, both as a method for controlling time-varying or nonlinear plant over a range of operating points, and for dealing with batch problems where the plant or materials vary over successive batches. This paper summarises and expands previous work on the design of self-tuning controllers. It discusses the closed-loop properties of various classes of self tuner, convergence concepts and results, and some of the technical problems involved with implementing self tuners on small computers or microprocessors.

关键词： controller commissioning tool controllers microprocessor implemented systems Nonlinear control systems control system analysis and synthesis methods performance recursive algorithms convergence computerised control control system synthesis self tuning control controllers control engineering computing nonlinear control systems

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COMPUTER-AIDED-DESIGN OF control-SYSTEMS VIA OPTIMIZATION

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1979年第6期126卷 573-578页

作者： BECKER, RG HEUNIS, AJ MAYNE, DQ Department of Computing and Control Imperial College of Science and Technology London UK

The paper describes a computer-aided-design procedure which may be used to design,inter alia, multivariable control systems which satisfy constraints on peak overshoot of step response on control magnitudes, control r... 详细信息

关键词： multivariable control systems control system CAD control system analysis and synthesis methods peak overshoot Optimisation step response Multivariable control systems Optimisation techniques control engineering computing optimisation control rates

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AGILE COMPUTER control OF A TURBOALTERNATOR

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1979年第5期126卷 385-392页

作者： LIMEBEER, DJN HARLEY, RG NATTRASS, HL Department of Electrical Engineering University of Natal Durban South Africa

The paper describes the design and implementation of a new type on nonlinear digital controller. This controller and other comparable ones are evaluated by implementing them on a laboratory microturboalternator system coupled to a minicomputer. Offline theoretical predictions of the system response, based on a comprehensive mathematical model, are presented. The results show that the transient performance of this new controller compares favourably with that of existing digital controllers. A novel nonrecursive solution to the discrete Riccati equation is also demonstrated.

关键词： turboalternator digital control mathematical model laboratory microturboalternator system Electronic control logic system response turbogenerators discrete Riccati equation Synchronous machines transient response computer control control gear and apparatus Power engineering computing control engineering computing control of electric power systems transient performance novel nonrecursive solution theoretical predictions alternators power system computer control nonlinear digital controller

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SEQUENTIAL DESIGN OF LINEAR-MULTIVARIABLE SYSTEMS

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1979年第6期126卷 568-572页

作者： MAYNE, DQ Department of Computing and Control Imperial College of Science & Technology London UK

The paper describes and critically assesses, in the light of recent advances, the sequential return difference method for the computer-aided design of linear multivariable control systems. In this method, a sequence of single-loop designs, using classical procedures, yields a multivariable design satisfying various criteria such as stability, disturbance attenuation, low interaction and integrity.

关键词： multivariable control systems control system CAD linear multivariable systems sequential design integrity low interaction control system analysis and synthesis methods single loop designs sequence stability disturbance attenuation Multivariable control systems critically assesses control engineering computing sequential return difference method

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control OF RESONANT VIBRATION IN A SPRING-FATIGUE-TESTING INSTRUMENT

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1978年第10期125卷 1045-1050页

作者： BARKER, HA NOBLE, AE MILLS, VO Scientific Instrumentation Centre C.S.I.R. Accra Ghana Department of Electrical & Electronic Engineering University of Aston Birmingham UK

The paper describes the design and implementation of control systems in an instrument for the fatigue testing of springs. A manual control system is used to establish a spring in a condition of mechanical resonance at a chosen amplitude of vibration, and an automatic control system is used to maintain this condition throughout the duration of a fatigue test. The problem of measuring the vibration amplitude is described, and the nature of the problem of controlling a resonant spring is discussed. For automatic control, an algorithm for the simultaneous extremal control of forcing signal frequency and regulatory control of forcing signal amplitude is developed, and implemented by means of a microprocessor. The methods used may be of more general application, particularly in vibration testing, and possible design improvements for such applications are discussed.

关键词： vibration control computerised instrumentation vibration testing spring fatigue automatic test equipment fatigue testing Other control applications in instrumentation control engineering computing resonant vibration control Other nonelectric variables control

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COMPREHENSIVE, YET COMPUTATIONALLY SIMPLE, DIRECT DIGITAL control-SYSTEM DESIGN TECHNIQUE

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1978年第12期125卷 1383-1395页

作者： KNOWLES, JB Atomic Energy Establishment Control & Instrumentation Division United Kingdom Atomic Energy Authority Dorchester UK

As a result of the enormous impact of microprocessors, electronic engineers, with sometimes only a cursory background in control theory, are being involved in direct-digital-control (d.d.c.) system design. There appears to be a real need for an easily understood and simply implemented comprehensive design technique for single-input d.d.c. systems. This is the objective of this largely tutorial paper, which assembles for the first time information that is widely scattered in the control-engineering literature. The proposed design technique provides, first of all, a simple calculation that ensures that the data sampling rate is consistent with the control system's accuracy specification or the fatigue life of its actuators. Pulsed transfer-function design for a plant controller is based on two simple rules and a few standard frequency-response curves, which are easily computed once and for all time. Structural resonances are eliminated by digital notch filters, the pole-zero locations of which are directly related to the frequency and bandwidth of an oscillatory mode; this is exactly as with analogue networks. In addition a computationally simple formula gives an upper bound on the amplitude of the control error (deviation) component due to multiplicative rounding effects in the digital computer; this thereby enables the selection of a suitable machine wordlength or machine. A distinct advantage of the proposed design technique is that its implementation does not necessarily involve a complex computer-aided-design facility. This aspect is confirmed by a class-2 design example in the text. Furthermore, the frequency-domain design curves are a versatile design tool in that they can also be used to design conventional 3-term digital controllers, or to translate a working analogue controller into its digital counterpart.

关键词： control system CAD frequency response curves CAD direct digital control digital controllers control system analysis and synthesis methods control system synthesis frequency domain design control engineering computing digital notch filters

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DESIGN OF HIERARCHICAL COMPUTER control-SYSTEMS FOR INDUSTRIAL PLANT .2. DEVELOPMENT OF HIERARCHICAL controlS FOR A MULTIPLE-EFFECT EVAPORATOR

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1978年第11期125卷 1299-1306页

作者： SANDOZ, DJ WONG, O MASSEY UNIV DEPT IND MANAGEMENT & ENGNPALMERSTON NORTHNEW ZEALAND

A generalised control algorithm is developed for application to industrial processes. The algorithm can cater for multivariable interactions, time delays and environmental disturbances. It is proposed as a fundamental building block for the development of hierarchical control schemes. The algorithm is a feature of a c.a.d. facility for the modelling, design and implementation of hierarchical computer controls. The facility incorporates interactive graphics as a major design aid. Application to a multiple-effect evaporator is described. It is demonstrated that the techniques have realistic potential for useful practical application.

关键词： multiple effect evaporator environmental disturbances evaporation interactive graphics Industrial applications of IT control technology and theory control applications in food processing industries Multivariable control systems hierarchical systems industrial plant multivariable interactions control engineering computing control system analysis and synthesis methods industrial computer control Food industry food processing industry control system CAD multivariable control systems hierarchical computer control systems generalised control algorithm time delays

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NUMERICAL DETERMINATION OF A PERFORMANCE INDEX FOR IMPROVED SYSTEM RESPONSE

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1978年第7期125卷 698-700页

作者： SMITH, JR STRINGFELLOW, DC VICKERS LTD DIV DESIGN & PROJECT SWINDON WILTSHIRE ENGLAND

The paper describes a computer program for the systematic numerical predetermination of a performance indexJ=∫∞0(xtQx+u2)dtsuch that the synthesised feedback controller that minimisesJresults in a controlled system with satisfactory eigenvalues that all lie to the left of the set {s|s=α, α≤0} in the complex plane. The computer algorithm, which is based on the derivatives of the eigenvalues with respect to the coefficients ofQ, may be used in isolation or can be included in an overall synthesis procedure. Examples illustrating the method are included.

关键词： performance index optimal control control system analysis and synthesis methods Other topics in systems theory eigenvalues control system analysis computing FORTRAN IV Optimal control computer algorithm synthesised feedback controller numerical determination control engineering computing computer program

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DIGITAL COMPUTATION OF FREQUENCY-RESPONSE

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1978年第3期125卷 244-245页

作者： ROGERS, GJ IOANNIDES, AC Department of Electrical Engineering University of Southampton Southampton UK

A method of computing frequency response from a state-space system model is given. Two applications of the method are discussed. The first shows its use in a situation where the system transfer function is more difficult to obtain than are the state equations, and the second illustrates the computation process in a system with pure time delays.

关键词： multivariable control systems frequency response transfer function control system analysis and synthesis methods control system analysis computing pure time delays delays Multivariable control systems state space system model control engineering computing linear systems state-space methods digital computation

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