In this paper a large-scale time-delay system is decomposed into N non-delay subsystems. A sub-optimal control based on heirarchical optimization of large-scale systems is then proposed and an algorithm for it is given.
In this paper a large-scale time-delay system is decomposed into N non-delay subsystems. A sub-optimal control based on heirarchical optimization of large-scale systems is then proposed and an algorithm for it is given.
A method for calculating dynamic security regions of power systems is developed. A dynamic security region is defined as the inverse image of the Liapunov region of the post-fault system under a mapping determined by ...
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A method for calculating dynamic security regions of power systems is developed. A dynamic security region is defined as the inverse image of the Liapunov region of the post-fault system under a mapping determined by the fault-on dynamics and the post-fault network. the region is defined in the pre-fault system state space.
the paper summarizes experiences of development and use of software for computer aided design of control systems. Different ways to arrange the interaction with users having wide ranges of experiences are discussed. T...
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the paper summarizes experiences of development and use of software for computer aided design of control systems. Different ways to arrange the interaction with users having wide ranges of experiences are discussed. this includes question and answer dialog with macro facilities as well as different types of menu-driven systems. A comprehensive set of packages for modeling, identification, analysis, simulation, and design are described. problems associated with structuring, portability, maintainability, and extensibility are discussed. Experiences from development and use of the packages in teaching and industrial environments are discussed.
this paper gives a short description of the CAD facilities available at the University of Trondheim, Division of Engineering Cybernetics and presents experiences and results from an operation period of almost ten year...
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this paper gives a short description of the CAD facilities available at the University of Trondheim, Division of Engineering Cybernetics and presents experiences and results from an operation period of almost ten years. the CAD facilities consist of an interactive program library, CYPROS, which contains general programs for simulation, identification, parameter estimation and control system design and a specialized CAD package for handling large scale systems. the programming language is standard Fortran IV and the packages are implemented on a medium size computer system where the user-program communication is based upon numerical terminals and video color graphics.
the linearized process dynamics of the boiler in a solar-powered central receiver change abruptly when clouds pass over the heliostats which direct the sun's rays toward it. the steam temperature regulator used to...
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the linearized process dynamics of the boiler in a solar-powered central receiver change abruptly when clouds pass over the heliostats which direct the sun's rays toward it. the steam temperature regulator used to control exit steam conditions must control a system with variable structure and discontinuous state trajectories. this paper investigates the quadratic-optimal control of such a system and gives the design equations for the optimal regulator.
A noble approach of decomposing a class of first-order distributed parameter systems is developed to formulate a coordinated control problem. Instead of making a discrete approximation, we partition the system into a ...
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A noble approach of decomposing a class of first-order distributed parameter systems is developed to formulate a coordinated control problem. Instead of making a discrete approximation, we partition the system into a number of subsystems only by making use of physical constraints and design objectives. the control is achieved by two level interative optimization schemes. the first level optimizes individual subsystems, and the second level adjusts the interaction variables between subsystems in order to satisfy the compatibility condition.
this paper describes the evolution of the use of engine models and optimal control theory for engine control systems research at General Motors Research Laboratories. It outlines the progress from simple static parame...
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this paper describes the evolution of the use of engine models and optimal control theory for engine control systems research at General Motors Research Laboratories. It outlines the progress from simple static parameter optimization on an engine in a test cell, through numerical optimization using multipoint regression models, to full state feedback linear quadratic optimal control and, finally, to an optimal output feedback control with state estimation using an eighteen state dynamic perturbation engine model.
Compared to other methods of model reduction in power systems such as modal analysis or coherency based methods, singular perturbation analysis has the advantages of retaining the physical identity of state variables ...
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Compared to other methods of model reduction in power systems such as modal analysis or coherency based methods, singular perturbation analysis has the advantages of retaining the physical identity of state variables and requiring less preprocessing of data. In this paper, the asymptotic expansion method is applied to the nonlinear model of a single machine infinite bus system with exciter and governor representation. the computational strategies and benefits are quantified through a three machine linearized model example.
By the term "complex dynamics" I shall mean (1) system trajectories that evolve through different qualitative modes of behavior such as growth, oscillation, or decay, (2) irregular, unstable (nonperiodic or ...
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By the term "complex dynamics" I shall mean (1) system trajectories that evolve through different qualitative modes of behavior such as growth, oscillation, or decay, (2) irregular, unstable (nonperiodic or chaotic) fluctuations and (3) endogenous phase switching, in which the equations governing change in system states switch from time to time according to rules or functions inherent in the system. In this paper we show how complex dynamics arise in a broad class of discrete time economic processes that can be represented by recursive programs.
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