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A pattern recognition approach for steady‐state security evaluation of an electrical power system

European Transactions on electrical Power 1991年第5期1卷 243-251页

A new pattern recognition approach to steady‐state security evaluation of electrical power systems is presented. Such approach is based upon a combined use of the „nearest‐neighbour” method and of an opportune system model ‐ previously proposed by the authors ‐for the basis of knowledge generation. In the first part of the paper, the definition of steady‐state security and the problems arising from its on‐line evaluation are briefly recalled. Then, the pattern recognition approach proposed is described in some detail, and its ability in order to overcome the computational drawbacks of traditional methods is illustrated. Afterwards, some remarks on the system model utilized are reported. Finally, a numerical experiment with reference to the AEP 14 bus test system is presented, showing very encouraging results. Copyright © 1991 John Wiley & Sons, Ltd.

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Interactive power system data preparation and verification using a pc‐editor

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European Transactions on electrical Power 1991年第3期1卷 149-152页

作者： Linke, K. Rumpel, D. Dip1.-Ing. Klaus Linke (1939) VDEis the director of the department "load dispatching and network operation" of Vereinigte Elektrizitatswerke Westfalen AG (VEW). DortmundGermany. After the study of electrical engineering at the Technical University of KarlsruhdGermany he started his professional career in an engineering-concern where he was responsible among others for investigations concerning the installation of process-computers in chemical plants. In 1968 he changed to VEW. Here in 1984 he took over his present position in which he is mainly engaged with the tasks of the management of the HV and EHV network and the power system control together with the problems concerning network automation incident to it. (Vereinigte Elektrizitatswerke Westfalen AG Hauptverwaltung Rheinlanddamm 24 W-4600 Dortmund 1 T +49 23 114 38-42 41) Dr.-Ing. Dieter Rumpel (1932) VDE is full professor and since 1978 head of the Power Systems Institute of Duisburg University Germany. He got his DiplAng. degree from the Technical University Munich and his Dr.-Ing. degree from the Technical University Berlin. Before his call to Duisburg he worked at Siemens AG for 23 years. (Universiiit-GHDuisburg Fachbereich Elektrotechnik PF 10 15 03 W-4100 Duisburg T 4 9 20 313 79-34 37)

For computerized power system operation, all objects of the network must be mapped in a data‐model. For this task, the „Grid Data Language” (GDL) does not apply format‐bound source data, but describes the objects using a format‐free source text. To handle such texts, an editing‐ and verification‐system was implemented. This paper reports its application when describing an extra‐high voltage network for use in a training simulator. In that way, the full content of a dispatcher EHV data‐model could be converted to GDL, requiring a work of 15 to 20 man‐days. Copyright © 1991 John Wiley & Sons, Ltd.

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Input Power Reduction of Waterwheel Generator Cooling Fan Motors with AC Variable Speed Drives

Input Power Reduction of Waterwheel Generator Cooling Fan Mo...

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International Conference on Applications of Industrial Electronics Systems, Proceedings

作者： Hong-woo Rhew Min-Ho Park Automation & Control Department Research Center KEPCO Daejeon South Korea Department of Electrical Engineering Seoul National University Seoul South Korea

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Long-Range Predictive control of Nonlinear Systems on the Basis of the Hammerstein Model

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IFAC Proceedings Volumes 1990年第1期23卷 165-169页

作者： R. Bars R. Haber Department of Automation Technical University of Budapest Goldmann Gy. tér 3 Budapest Hungary Fachhochschule Köln Faculty of Plant and Process Engineering Köln FRG and Ruhr-University Faculty of Mechanical Engineering Department of Control Systems Bochum FRG

The unknown nonlinear process is approximated by the Hammerstein model, which is one of the natural expansions of the discrete convolution model to nonlinear systems· Because of the large number of the parameters an identification procedure with scalar convergence coefficients is recommended. The control task is to follow a reference model output predicted ahead in a given horizon· The present and future control activities during the prediction horizon are determined minimizing a functional of the error signal between the predicted values of the reference model and the system output. The control signal is assumed constant during the control horizon and the calculation is repeated in each control interval. Simulation results represent the robust behaviour of the control algorithms.

关键词： Nonlinear control systems predictive control nonparametric models adaptive control control theory

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Petri net analysis of a transfer-line protocol

Petri net analysis of a transfer-line protocol

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International Conference on Computer Integrated Manufacturing

作者： B.H. Krogh W.L. Genter Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Process Control and Manufacturing Technology Division Alcoa Technical Center Alcoa Center PA USA

Petri nets are applied to the bottom-up design of a handshaking protocol for transferring parts through a sequence of workstations. The authors illustrate the application of Petri-net theory to verify properties of the complete system behavior based on the structure of the Petri-net model. It is shown that communication between local controllers is modeled by places corresponding to upstream and downstream messages. Consistency in the interconnection of the subsystem models is guaranteed by the identification of these communication places. To analyze the properties of the complete system, results on liveness and place invariants for Petri nets are applied to the Petri-net model.< >

关键词： Protocols Workstations Petri nets Power system modeling Communication system control Algorithm design and analysis Computer aided manufacturing Virtual manufacturing Computational modeling System performance

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Analysis of Thermal Camber control in Rolling Mills

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IFAC Proceedings Volumes 1990年第8期23卷 149-154页

作者： G.C. Goodwin B.M. Carney W. John Edwards Centre for Industrial Control Science Department of Electrical Engineering and Computer Science University of Newcastle N.S.W. 2308 Australia Industrial Automation Services Pty. Ltd. 173 Main Road Speers Point N.S.W. Australia

The demand for wider, thinner rolled steel has led to an increasing interest in the control of the strip “shape”. Mechanisms for controlling shape include roll bending, roll tilt (or mill steer) and spray pattern control. This paper will principally focus on an analysis of the spray control system and the associated interaction between adjacent zones. This paper decribes a new approach to shape control, a mathematical model is derived for the dynamic thermal expansion of the rolls of the a tandem cold rolling mill. The model structure has been specifically designed to facilitate control studies. The system is highly non-linear but the model suggests how the system can be linearized by an appropriate input signal transformation. The linearized system then represents a coupled multi-input multi-output dynamical system linking the cooling water sprays to the measured exit strip shape. This linearized model leads to a dynamical decoupling procedure which reduces the system to a set of single-input single—output control systems. Apart from the application to shape control, the method proposed here has more general applicability since the same kind of problem arises in a variety of cross-machine probelms.

关键词： Rolling Mills Shape control Decoupling Simulation Non Linear control System

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Learning control system design based on 2D theory-an application to parallel link manipulator

Learning control system design based on 2D theory-an applica...

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IEEE International Conference on Robotics and automation (ICRA)

作者： Z. Geng J.D. Lee R.L. Carroll L.H. Haynes Department of Electrical Engineering and Computer Science George Washington University Washington D.C. DC USA Guidance and Control Branch NASA''s Goddard Space Flight Center Greenbelt MD USA Intelligent Automation Inc. Rockville MD USA

An approach to iterative learning control system design based on 2D system theory is presented. A 2D model for the iterative learning control system which reveals the connections between learning control systems and 2D system theory is established. A learning control algorithm is proposed, and the convergence of learning using this algorithm is guaranteed by 2D stability. The learning algorithm is applied successfully to the trajectory tracking control problem for a parallel link robot manipulator. The excellent performance of this learning algorithm is demonstrated by computer simulation results.< >

关键词： control systems Iterative algorithms control system synthesis Iterative methods Convergence Stability Trajectory Parallel robots Manipulators Computer simulation

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STRUCTURE SYNTHESIS OF INVARIANT control-SYSTEMS

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INTERNATIONAL JOURNAL OF control 1989年第5期49卷 1453-1463页

作者： YAKOVLEV, VB IMAEV, DH Department of Automation and Control Processes Leningrad Electrical Engineering Institute Professor Popov Street 5 Leningrad 197022 U.S.S.R

Invariance is a primary characteristic of a control system. It is strongly interrelated with the system structure where the latter provides a necessary condition for the invariance. The relationship is established by using various formal languages among which the graph-theoretic model seems most adequate when it comes to analysing the causal relations between components of the system. The present work aims to reflect the close interdependence between a number of invariance types and graph structures. Some typical algorithms for solving the problems of structure selection are demonstrated.

关键词： control Systems

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A simulation technique for control systems with multiple interrelated nonlinear phenomena and energy storage elements

A simulation technique for control systems with multiple int...

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Annual Conference of Industrial Electronics Society

作者： P.H. Lewis P. Angeli Department of Electrical Engineering Michigan Technological University Houghton MI USA Process Instrumentation and Control Engineering Department 3M Center 3M Corporation Saint Paul MN USA

A method is described for the systematic development of computer models for control systems with complex relationships between multiple nonlinear phenomena and energy-storage elements. The specific example of an electromechanical position control system, with consideration of interrelated actions that include static friction, Coulomb friction, backlash, and a significant inertial load, is considered. The use of piecewise-linear models provides an extensive set of operational modes, but methodology is presented for consideration of the conditions for all possible changes of mode and the actions that accompany each change. Simulation results are presented.< >

关键词： control system synthesis Nonlinear control systems DC motors Friction Position control Piecewise linear techniques Gears Energy storage Computational modeling Rotors

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Workload redistribution for fault-tolerance in a hard real-time distributed computing system

Workload redistribution for fault-tolerance in a hard real-t...

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International Symposium on Fault-Tolerant Computing (FTCS)

作者： S. Balaji L. Jenkins L.M. Patnaik P.S. Goel Control Systems Division ISRO Satellite Centre Bangalore India Department of Electrical Engineering Indian Institute of Science Bangalore India Department of Computer Science & Automation Indian Institute of Science Bangalore India

In a hard real-time distributed computing system (HRTDCS), all the tasks are required to meet their associated deadlines; a task not meeting its deadline leads to a catastrophic failure of the system. The authors consider an HRTDCS that executes both periodic and aperiodic tasks associated with timing, precedence, and resource constraints. The fault-tolerance capability in such a system is achieved through the use of time redundancy. The problem of workload redistribution for fault tolerance in an HRTDCS is studied. A graph model to represent the system workload is developed. Three performance measures for the analysis of an HRTDCS are defined. A nonpreemptive scheduling algorithm is proposed to distribute the workload of the operational nodes of the HRTDCS in the presence of both hardware and task failures. This task allocation strategy is applied to a practical system, namely, the HRTDCS onboard a spacecraft. The performance measures obtained for a typical system workload indicate that the algorithm is quite suitable for an HRTDCS with regard to uniform workload distribution.< >

关键词： Fault tolerance Real time systems Distributed computing Timing Fault tolerant systems Redundancy Performance analysis Scheduling algorithm Hardware Space vehicles

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