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Steady‐state security evaluation of electrical power systems by means of artificial neural network

European Transactions on Electrical Power 1995年第2期5卷 91-97页

作者： Chiodo, E. Menniti, D. Testa, A. Picardi, C. Elio Chiodo (1959) received the degree in Electronics Engineering in 1985 and the Ph.D. degree in Computational Statistics both from the University of Naplefltaly. He is a Researcher at the Department of Electrical Engineering of the University of Naples and a member of the Italian Statistical Society. His areas of interest include probabilistic methods applied to electric power systems analysis. (University of Naples Fedrrico 11. Electrical Engineering Dept.via Claudio 21 1-80125 Naplefltaly T +3981/7683226 Fax+3981/2396897) Daniele Menniti (1958) received the degree in Electrical Engineering from the University of Calabria. Cosenzataly and the Ph.D. degree in Electrical Engineering from the University of NapleslItaly in 1984 and 1989 respectively. He is a researcher at the Electronic. Computer and Systems Science Department of the University of Calabria. Italy. Hiscurrent research interests concern electric power system analysis real-time control and automation. (University of Calabria Electronic Computer and Systems Science Dep. Arcavacataji Rende (CS). 1-87036 CosenzdItaly T +39984/494707. Fax +39984/4947 13) Alfredo Testa (1950) received the degree in Electrical Engineering from the University of Naples/Italy in 1975. He is an Associate Professor in Electrical Power Systems at the Department of Electrical Engineering of the University of Naples. He is engaged in researches on electrical power systems reliability and harmonic analysis. (University of Naples Federico 11. Electrical Engineering Dep. via Claudio '2 1 1-80 I25 NapleslItaly T + 39 8 I/7 68 3'2 11. Fax+3981/2396897) Ciro Picardi (1949) received the degree in Electronics Engineering from the University of Naples/Italy in 1975. He is currently Associate Professor in Process Control at the Department of Electronic Computer and System Science of the University of Calabria. Italy. His current research interests are in the area of electrical drives robotics neural networks and fuzzy control. (University of Calabria Electronic. Compu

An artificial‐neural‐network (ANN) application for steady‐state security evaluation of electrical power systems is presented. Such application is based upon a combined use of a multilayer back‐propagation neural network and of an opportune electrical system model, previously proposed by some of the authors. In the paper, the definition of steady‐state security and the problems arising from its on‐line evaluation are briefly recalled. Then, the ANN utilized is described with particular reference to the solutions adopted by the authors. Afterwards, some remarks on the system model utilized are reported. Finally, numerical applications on the AEP‐14 bus system are presented and the results obtained with different ANN configurations are analyzed. Copyright © 1995 John Wiley & Sons, Ltd.

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A LYAPUNOV-LIKE APPROACH TO PERFORMANCE ANALYSIS OF 3-DIMENSIONAL PURE PNG LAWS

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IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC systems 1994年第1期30卷 238-248页

作者： SONG, SH HA, IJ Department of Control and Instrumentation Engineering Automation and Systems Research Institute Seoul National University Seoul South Korea

The 3-dimensional PPNG (pure proportional navigation guidance) law was proposed about forty years ago, but its performance has been analyzed only on the basis of the linearized trajectory equations, which are valid locally around the collision course. We take into full account the nonlinear dynamic characteristics of pursuit situation in the 3-dimensional space to analyze the performance of the 3-dimensional PPNG law more rigorously. We prove that a missile guided by the 3-dimensional PPNG law can always intercept a target maneuvering randomly in the 3-dimensional space if 1) the target acceleration varies with a known bound, 2) the navigation constant is selected large, and either 3a) the initial heading error is small or 3b) the missile keeps the head toward the target during flight. We also propose a modified PNG law, which seems to exhibit better performance at the final phase of pursuit than the conventional PPNG law. We introduce a Lyapunov-like method that proves to be a very powerful tool in obtaining our results.

关键词： Performance analysis Missiles Acceleration Navigation Angular velocity Nonlinear equations Angular velocity control Proportional control control systems Instruments

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GLOBAL PATH PLANNING FOR MOBILE ROBOT WITH GRID-TYPE WORLD MODEL

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ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING 1994年第1期11卷 13-21页

作者： LEE, JG CHUNG, HY Automation and Systems Research Institute and Department of Control and Instrumentation Engineering Seoul National University Seoul Korea 151–742

This paper presents a new methodology for global path planning for an autonomous mobile robot in a grid-type world model. The value of a certainty grid representing the existence of an obstacle in the grid is calculated from readings of sonar sensors. In the calculation, a way of utilizing three sonar sensor readings at a time is introduced, resulting in a more accurate world model. Once the world model is obtained, a network for path planning is built by using the model. The global paths, defined as the shortest paths between all pairs of nodes in the network, are calculated. A fast algorithm using a decomposition technique is proposed for real-time calculation. The new methodology has been implemented on the mobile robot whose role is to transport materials in a flexible manufacturing system. The results show that the proposed method of certainty grids satisfactorily represents a precise environment, including the locations of obstacles. Thus, the robot successfully comprehends its surroundings, and navigates to its destinations along optimal paths.

关键词： Mobile robots

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EXPLICIT CHARACTERIZATION OF ALL FEEDBACK-LINEARIZING controlLERS FOR A GENERAL TYPE BRUSHLESS DC MOTOR

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IEEE TRANSACTIONS ON AUTOMATIC control 1994年第3期39卷 673-677页

作者： HA, IJ KANG, CI Department of Control and Instrumentation Engineering Automation and Systems Research Institute Seoul National University Seoul Kyunggi South Korea

In this note, we consider feedback-linearizing control of brushless dc motors which have been increasingly used in high-performance servo applications. We completely characterize the whole class of the feedback controllers that enable the brushless dc motors to behave like linear systems but without torque ripple. The whole class of the feedback-linearizing controllers is characterized in the explicit form which contains a function to be chosen freely. The previously known controllers correspond to either the particular ones in our whole class of the feedback-linearizing controllers or their truncated Fourier expansions. This free function can be used to achieve other control objectives as well as linear dynamic characteristics. Furthermore, our feedback-linearizing controllers can be easily determined from the measurement data of back EMF and can be used even for the case of asymmetric back EMF.

关键词： Brushless DC motors Stators control systems Linear systems Shape control Automatic control Servomechanisms DC motors Torque control Adaptive control

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ASSEMBLY-LINE BALANCING WITH BUFFERS BY MULTIPLE CRITERIA OPTIMIZATION

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 1994年第9期32卷 2159-2178页

作者： MALAKOOTI, BB [a]Department of Systems Control and Industrial Engineering Center for Automation and Intelligent Systems Research Case Western Reserve University Cleveland OH 44106 USA

One of the problems in the design of multi-station lines is the allocation of different work elements to various workstations. This problem is called Assembly Line Balancing (ALB). The failure of workstations and other unforeseen circumstances can result in unnecessary idling of the production line. In order to improve the production rate of such systems, buffer storage of certain capacities can be allocated between each pair of workstations. In this paper, ALB with buffers is formulated as a Single Criterion Decision Making as well as a Multiple Criteria Decision Making problem. In the single objective problem, the cycle time is given and the optimal number of workstations and buffer sizes is obtained to minimize the total cost. In the Multiple Criteria problem, several criteria (objectives) are defined. These objectives are the number of workstations, their buffer sizes, the cycle time, and the total cost of operation with buffers. We demonstrate how the set of efficient (nondominated) alternatives for the multiple criteria problem can be generated. The paper also describes how the best alternative can be selected through the use of existing interactive multiple criteria methods. Several examples are solved and the results of computational experiments are provided.

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Grey-Box Modeling for Identification and control: An Emerging Discipline or an Established Technology?

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IFAC Proceedings Volumes 1994年第8期27卷 1193-1198页

作者： S. Bay Jorgensen K.M. Hangos Department of Chemical Engineering Technical University of Denmark Systems and Control Research Laboratory: Computer and Automation Institute HAS

Grey box modeling is a widely used term, which presently reflects that both a priori and experimental knowledge is being incorporated into the model building process. A brief investigation into various uses of grey box modeling approaches reveals that they mainly differ with respect to the required model accuracy. The goal of the model application also has to be considered in the model building, since it constrains the necessary accuracy required by the model. In this paper these two viewpoints are combined thus leading to a proposed new definition of grey box modeling.

关键词： Qualitative differential and algebraic equations Uncertainty representation Verbatim models Robust identification and control Modeling cycle

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Decentralized Variable Structure control of Complex systems

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IFAC Proceedings Volumes 1994年第11期27卷 227-232页

作者： V. Veselý D. Kalaš Slovak Technical University Department of Automatic Control Systems Faculty of Electrical Engineering Bratislava Slovakia Slovak Technical University Department of Control and Automation Faculty of Electrical Engineering Bratislava Slovakia

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.

关键词： Decentralized control diagonal dominance variable structure systems large scale systems

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Fuzzy rule based analysis of industrial systems behavior

Fuzzy rule based analysis of industrial systems behavior

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： G. Vachkov K. Hirota Department of Automation of Industry Sofia University of Technology Sofia Bulgaria Department of Systems Control Engineering College of Engineering IBM Corporation Karlsruhe Tokyo Germany

A relatively simple method of solving the inverse problem by using fuzzy rule based model of a multi-input and multi-output (MIMO) system is presented. It utilizes the concept of grid-type fuzzy model by use of a complete set of rules and numerical outputs (consequents). Then with a given system outputs, a set of so called dominant rules is extracted as possible solutions. They can be used further in analyzing the possible actions of the system inputs. Two examples show the applicability of the method proposed.< >

关键词： Fuzzy systems Humans Inverse problems Fuzzy sets Electrical equipment industry Fault diagnosis Industrial control automation Educational institutions control engineering

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A graph-theoretic approach to integrated process and control system synthesis

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IFAC Proceedings Volumes 1994年第7期27卷 61-66页

作者： K.M. Hangos F. Friedler J.B. Varga L.T. Fan Systems and Control Research Laboratory Computer and Automation Institute Hungarian Academy of Sciences H-1518 Budapest Pf. 63 Hungary Department of Systems Engineering Research Institute of Chemical Engineering Hungarian Academy of Sciences H-8201 Veszprim Pf 125 Hungary Department of Chemical Engineering Kansas State University Manhattan KS 66506 USA

A graph-theoretic method for integration of process and control system (IPCS) syntheses has been proposed in the present paper. The foundation of this integration is a well-established, graph-theoretic approach to process synthesis in conjunction with the analysis of structural controllability based on digraph-type process models. A directed bipartite graph, the CP-graph, has been introduced for unambiguous representation of an IPCS structure. The notion of CP-graph has given rise to a set of axioms for describing the combinatorially feasible and controllable structures. The maximal controllable structure of an IPCS synthesis problem has been defined as the union of combinatorially feasible and controllable IPCS structures; obviously, the optimal IPCS structure must be a substructure of this maximal controllable structure. Thus, the mathematical programming model, e.g., MINLP model, of an IPCS synthesis problem should be derived from the maximal controllable structure. The fundamental combinatorial algorithm of IPCS synthesis, i.e., algorithm CMSG, for identifying this maximal controllable structure has been formulated. The complexity of this algorithm has been proved to be polynomial on the size of the problem; its efficacy is illustrated with a relatively simple example. The resultant IPCS structures are compared with the structures synthesized without considering their control systems.

关键词： Process control control system synthesis structural controllability combinatorial mathematics synthesis methods

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A Practical Adaptive Tracking Filter for Maneuvering Targets

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IFAC Proceedings Volumes 1993年第2期26卷 793-796页

作者： T.K. Sung J.G. Lee Department of Control and Instrumentation Engineering & Automation and Systems Research Institute Seoul National University Korea

A practical adaptive tracking filter for maneuvering targets and nonlinear measurements is proposed by combining a modified input estimation technique with pseudo-residuals and a decoupled tracking filter in LOS Cartesian coordinate system. Since the proposed adaptive tracking filter has a decoupled structure, maneuver input estimates can be computed for three axes separately. Consequently, without degrading performance, computation is drastically reduced compared to a coupled adaptive tracking filter with input estimation technique in inertial coordinate system. Also, by small cross-correlations of pseudo-measurement noises, the proposed tracking filter produces less false alarms or miss detections to improve the performance

关键词： adaptive tracking filter maneuvering targets decoupled tracking filter in line-of-sight coordinate system input estimation technique

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