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IEEE Control Systems Magazine

Issue 1 • Date Jan. 1989

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Displaying Results 1 - 18 of 18
  • New approaches to voltage monitoring and control

    Publication Year: 1989, Page(s):5 - 11
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (743 KB)

    Voltage-related problems evolving in interconnected electric power systems are examined. Reasons for these problems are introduced, and their potential importance for system operation is discussed. This physical phenomenon poses problems covering the entire spectrum from proper modeling to control design and communications. Consequences of novel control designs are discussed in the context of the ... View full abstract»

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  • Robust damping controls for large power systems

    Publication Year: 1989, Page(s):12 - 18
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (924 KB)

    A perspective on the need for robust damping controls in the extensive power system that serves western North America is offered. Key issues include the dynamics of the power system, known threats to controller robustness, and the information-poor environment in which major damping controllers must be designed and operated. The discussion covers power system stability control, reactive-power modul... View full abstract»

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  • Control for stability in interconnected power systems

    Publication Year: 1989, Page(s):19 - 22
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (503 KB)

    The development of a number of stabilizing controls is described. The robustness of the overall power system is emphasized along with modifications to the basic controls necessary to achieve this robustness. Analytical tools used in the design of practical power system controls are described. The importance of validation of modeling and simulation methods by planned system tests and by the analysi... View full abstract»

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  • Stability analysis of power systems by Lyapunov's direct method

    Publication Year: 1989, Page(s):23 - 27
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The Lyapunov direct method is on the verge of being implemented for assessment of online dynamic security. The main bottleneck has been in the proper characterization of the stability boundary and defining the fault-dependent region of attraction locally around the controlling unstable equilibrium points. Now there is a better understanding of this issue, and hence, a number of algorithms have bee... View full abstract»

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  • Multivariable control for damping interarea oscillations in power systems

    Publication Year: 1989, Page(s):28 - 32
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (598 KB)

    The application of a multivariable output feedback controller to damp the interarea oscillations of a power system consisting of three equivalent generators, each equipped with an exciter, a power system stabilizer, and a prime-mover with governor, is addressed. The multivariable controller uses projective controls and coordinates readily available measurements with control signals applied to the ... View full abstract»

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  • Optimal regulation for thermal power plants

    Publication Year: 1989, Page(s):33 - 38
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (682 KB)

    The design of an advanced digital control system that is used to regulate the steam temperature in the boiler of a thermal power plant is described. An autoregressive model is used to obtain the plant transfer characteristics. To compensate for system nonlinearities, the calculations for system identification and feedback gain are determined for two or three load levels. Experimental results have ... View full abstract»

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  • Control of electric power systems using real-time measurements

    Publication Year: 1989, Page(s):39 - 45
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (964 KB)

    Microprocessor-based relaying systems are described, and technology involved in the measurement systems is explained. Estimation and control problems most affected by the real-time measurements are discussed. These include dynamic estimation and control, transient stability and related protection functions, and load shedding and restoration.<> View full abstract»

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  • Example of exact trade-offs in linear controller design

    Publication Year: 1989, Page(s):46 - 52
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (694 KB)

    Two examples of analytic methods for finding the exact form of trade-offs among such desirable qualities as fast response to commands without excessive overshoot, low actuator authority, robustness, low controller complexity, and so on are considered. They are linear quadratic Gaussian theory, where the plant actuator and output variance can be traded off, and Nevanlinna-Pick theory, where, for in... View full abstract»

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  • Simulator for dynamical systems using graphics and equations for modeling

    Publication Year: 1989, Page(s):53 - 58
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (661 KB)

    A prototype simulator for dynamical systems, called Hibliz (hierarchical block diagrams with information zooming), which explores some features of modern computer graphics, is presented. Hibliz supports hierarchical block diagrams to describe the model decomposition and interconnection structure. The user can scroll, pan, and zoom the block diagram continuously in real time. Zooming controls the a... View full abstract»

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  • Multivariable toolbox for use with MATLAB

    Publication Year: 1989, Page(s):59 - 65
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (701 KB)

    A toolbox for the frequency-domain analysis and design of multivariable feedback systems, to be used with the software products PC-MATLAB or PROMATLAB, is described. The principal model representations used by the toolbox are described. Its capabilities are illustrated by a worked design example that shows the use of a Nyquist array method. Other design techniques supported by the toolbox are revi... View full abstract»

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  • Software package for optimization-based design with user-supplied simulators

    Publication Year: 1989, Page(s):66 - 71
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (678 KB)

    User-machine interaction is a central component of CONSOLE, a recently developed design package. This allows repeated intervention of the designer to deal with multiple trade-offs that appear in the course of numerical optimization. Another important feature of CONSOLE is its two-module structure, which allows complete detection of syntax errors in the problem description before execution of the o... View full abstract»

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  • The choice of controller zeros

    Publication Year: 1989, Page(s):72 - 75
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB)

    The positioning of the controller zeros near the slow process poles though greatly improving the speed of response for a set-point change, can be detrimental to load rejection. This result is used to explain the heuristics used in the Ziegler-Nichols tuning formula for proportional-integral-derivative controllers and in the positioning of controller zeros in pole-placement controllers and phase-la... View full abstract»

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  • Introduction to networking for integrated control systems

    Publication Year: 1989, Page(s):76 - 79
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (490 KB)

    Integrated control system design, which requires interactions between the disciplines of communication systems and control systems, is introduced. An integrated control system has disparate and spatially distributed subsystems interconnected via a common communication channel. Digital data from sensor to controller and from controller to actuator are multiplexed along with traffic from other contr... View full abstract»

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  • Model reference adaptive control of a direct-drive DC motor

    Publication Year: 1989, Page(s):80 - 84
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    An adaptive time-optimal position controller for a direct-drive DC motor with a design based on the model reference adaptive approach is presented. The high-acceleration torque of DC motors with permanent magnets permits direct coupling of the load to the motor axis, avoiding the use of a transmission with its inherent disadvantages (such as backlash and friction). However, direct coupling induces... View full abstract»

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  • Active vibration suppression for the mast flight system

    Publication Year: 1989, Page(s):85 - 90
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (922 KB)

    Active vibration suppression of a large flexible space structure is addressed. The system (experimental test bed), performance requirements, and system simulations and models are described. The structures is a 60-m truss beam attached to the Shuttle orbiter. A baseline control system is required to provide 5% structural damping for the first ten structural (flexible) modes of the truss beam. The c... View full abstract»

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  • Multivariable internal model control for a full-scale industrial distillation column

    Publication Year: 1989, Page(s):91 - 96
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (589 KB)

    A multivariable internal model control system was developed for a full-scale distillation column. The basis for the design of the control is a two-input/two-output matrix of linear transfer functions describing column dynamics. The control system is designed to perform dual composition control of the overhead and bottom products. Hardware constraints dictate multirate sampling of the product conce... View full abstract»

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  • Issues in the design of intelligent control systems

    Publication Year: 1989, Page(s):97 - 99
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (387 KB)

    It is argued that the development of an effective methodology for the design of intelligent control systems requires the synthesis of many concepts from artificial intelligence, real-time computing, and control engineering. Furthermore, it is contended that this synthetic process necessitates the radical reappraisal of much of modern control engineering in order to reestablish research priorities.... View full abstract»

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  • Comments on 'Optimal gain for proportional-integral-derivative feedback' by S.A.K. Al-Assadi and L.A.M. Al-Chalabi

    Publication Year: 1989, Page(s):100 - 101
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (195 KB)

    This comment concerns the comparison of tuning parameters for proportional-integral-derivative (PID) controllers proposed in the above paper (ibid., vol.7, no.6, p.16-19, 1987). The commenters focus on the time-delay example and the resulting table contained in the above paper. They remark on some fundamental points regarding PID controllers that have been misunderstood in the above paper as well ... View full abstract»

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Aims & Scope

This Magazine ceased publication in 1990. The current retitled publication is IEEE Control Systems.

Full Aims & Scope