A new transient stability controller system (TSC) based on on-line transient stability calculation has been developed. The TSC system prevents the power system from wide-area blackout by shedding generators optimally ...
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A new transient stability controller system (TSC) based on on-line transient stability calculation has been developed. The TSC system prevents the power system from wide-area blackout by shedding generators optimally when a serious fault occurs. This system consists of a central processing unit (TSC-P), and four local units for fault detection (TSC-C), and seventeen units for generator shedding(TSC-T). The TSC-P selects optimal generators to be shed for stabilization based on on-line transient stability calculation for contingencies at 500 kV lines and buses every five minutes. The results are transmitted to the TSC-Cs periodically. Should any fault occur, only one TSC-C will detect the fault occurrence and send control signals to the TSC-Ts which actually generate shedding signals. To realize the TSC system, essential are fast stability evaluation methods for a large number of contingencies and effective selection methods of optimal generators to be shed for stabilization. This paper presents total algorithms applied in the TSC-P, the results of algorithm verification tests using a prototype system combined with a large-scale analog simulator, and the characteristics of the actual system.
A brief overview of some of the current debates on the methods of writing the history of technology is given. Some questions on how to use history within control education are posed.
A brief overview of some of the current debates on the methods of writing the history of technology is given. Some questions on how to use history within control education are posed.
作者：
B. HrúzA.J. NiemiT. VirtanenSlovak Technical University
Faculty of Electrical Engineering and Information Technology Department of Automatic Control Systems Ilkovicova 3 812 19 Bratislava Slovak Republic phone: +42 -7-791698 Helsinki University of Technology
Department of Information Technology Control Engineering Laboratory Otakaari 5A FIN-02150 Espoo Finland phone: +358-0-4513334
An approach using Petri nets to modelling and control of flexible manufacturing systems (FMS) is worked out in the paper. A class of Petri nets suitable for the modelling of FMS and for the design of their control is ...
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An approach using Petri nets to modelling and control of flexible manufacturing systems (FMS) is worked out in the paper. A class of Petri nets suitable for the modelling of FMS and for the design of their control is formulated. In the Petri net models not only conflicts due to mutual exclusions of the shared system resources but conflicts of branching operations are analyzed and solved, as well. Models of FMS suitable for system performance analysis and control design are built up of a set of elementary building blocks proposed in the paper. Analysis, modelling method and control design is developed on the background of a pilot experimental FMS developed at the Helsinki University of Technology.
This paper proposes a robust method for automatic tuning of parameters of a discrete PID controller. The tuning rules for SISO and MIMO systems are based on automatic determination of critical gain and critical freque...
This paper proposes a robust method for automatic tuning of parameters of a discrete PID controller. The tuning rules for SISO and MIMO systems are based on automatic determination of critical gain and critical frequency from the estimated model parameters. The plant model can be expressed by a transfer function in continuous and/or discrete form or by differential and/or difference equation. A simple control law using Takahashi discrete form is proposed. Simulations results prove that it is easy to use being able to handle minimum and nonminimum phase plant as well.
The principal aim of this paper is to present a new algorithm for the control of continuous time linear systems with a large relative degree and unknown parameters. If the standard approach is used for these systems, ...
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The principal aim of this paper is to present a new algorithm for the control of continuous time linear systems with a large relative degree and unknown parameters. If the standard approach is used for these systems, the controller structure is very complicated and implementation is problematic. A comparative study of two classes of model reference adaptive control methods is also presented. Finally, simulation results are also presented to illustrate the effectiveness of the proposed method.
In this article a multimedia computer-assisted learning (MCAL) system is presented. The major objective of this work was to investigate the potential of using such systems as tools for transferring instructional cours...
In this article a multimedia computer-assisted learning (MCAL) system is presented. The major objective of this work was to investigate the potential of using such systems as tools for transferring instructional course information through various types of computer media as opposed to the classic CAL systems. The philosophy and techniques employed to design the system are investigated. Usage of the implemented system and its merits have been illustrated through its application to teach engineering students and technicians the theory and concepts of marine radar. System design, implementation, test, and revision phases are presented and discussed.
The paper considers the problem of stabilizing large scale dynamic systems (LSS) via decentralized controllers based on Variable Structure systems (VSS) and using the principle of dominant subsystems. The principle an...
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The paper considers the problem of stabilizing large scale dynamic systems (LSS) via decentralized controllers based on Variable Structure systems (VSS) and using the principle of dominant subsystems. The principle and applications for LSS are described and simulation test results on a two- machines power system with nonlinear model are presented.
Since the course 1989-90 is being devetoped an experience of innovation on control and Automation education. The main aims of this experience are :To avoid the dispersionof subjects in an educational working day, to m...
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Since the course 1989-90 is being devetoped an experience of innovation on control and Automation education. The main aims of this experience are :To avoid the dispersionof subjects in an educational working day, to make sure the theory-practice integration to provide anactive and personal teaching to focus the student atention on the essential points of subject. The aim of this methodology isto favour the active learning so that each student takes the leading role of his own learning process. In this way, the teacher is the promoter of the work of students.
This paper addresses the design of a selftuning controller for linear and non-linear dynamic systems. Modelling of nonlinear dynamic systems is realized using the expanded Voltera kernels by orthonormal Laguerre funct...
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This paper addresses the design of a selftuning controller for linear and non-linear dynamic systems. Modelling of nonlinear dynamic systems is realized using the expanded Voltera kernels by orthonormal Laguerre functions in a continuous and a discrete form. A predictive nonlinear control law is derived on the base of the Laguerre polynomials in a recursive form. The proposed control law has many benefits (simple use. easy handling of varying time delay and nonminimum phase behaviour, etc.). The method outlined in this paper presents new trends in design of control of nonlinear plants using selftuning DDC algorithms. The theoretical part of the paper presents several modifications of modelling and control algorithms design yielding new results with proof of convergency properties for Laguerre spectra estimation procedure. Practical problems solutions are involved.
作者：
B. HrúzSlovak Technical University
Faculty’ of Electrical Engineering Department of Automatic Control Systems 81219 Bratislava Ilkovičova 3 Slovak Republic
The supervisory control problem in the discrete event dynamic systems (DEDS) is formulated using input-state-output system structure. A class of the Petri nets is defined enabling an effective and practically useful r...
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The supervisory control problem in the discrete event dynamic systems (DEDS) is formulated using input-state-output system structure. A class of the Petri nets is defined enabling an effective and practically useful representation of the structural and dynamic properties of DEDS. A solution of the supervisory control using the Petri nets and the corresponding reachability graphs is presented and illustrated on an example.
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