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Measurements of power and current components in unbalanced and distorted three‐phase systems

European Transactions on Electrical Power 1993年第1期3卷 75-83页

作者： Andria, G. Salvatore, L. Savino, M. Trotta, A. Dr. Gregorio Andria (1956) AEI received the M. S. degree in Electrical Engineering from the State University of Bari/Italy in 1981 and the Ph. D. degree in Electrical Engineering in 1987 from the same University. From 1981 to 1983 he was working in the Electrotechnics and Electronics Department of the University of Bari as a member of the research team on electrical measurements. From 1984 to 1986 he was a Doctoral Fellow and currently he is a researcher in the same department. His research interests are in the fields of electrical and electronic measurements on components and systems including digital measurements for the analysis of electrical quantities in non-sinusoidal systems and the design of integrated optical sensors for measurement and control of non-electrical physical quantities. (Department of Electrotechnics and Electronics Faculty of Engineering polytechnic of Bovia E. Orabona 4 1-70125 Bari. Italy T +3980/242266 Fax + 3980/242410) Prof. Luigi Salvatore (1945) AEI received the degree in electrical engineering from the University of Bari/Italy in 1970. Since 1976 he has worked in the Electrotechnical and Electronic Department of the same University as a member of the research team on electrical machines. From 1983 to 1987 he was a researcher of electrical machines in the same department. Since 1987 he has been an Associate Professor of electrical machines at the University of Bari. At the present time his research interests include the control monitoring and diagnostics of AC drives and the areas of signal processing anddigital measurements on power electronics systems. (Department of Electrotechnics and Electronics Faculty of Engineering Polytechnic of Bari via E. Orabona 4 I-70125 Bari Italy T + 3980/242258 Fax + 3980/242410) Prof. Mario Savino (1947) AEI received the degree in Electrical Engineering from the University of Barif Italy in 1971. Since then he has been working in the Electrotechnical Institute of Bari until 1973 as researcher from 1973 to 1982 as Assistant Profe

The paper deals with the instantaneous power theory in three‐phase circuits by using the instantaneous time phasors of voltage and current. Particularly it is shown that the instantaneous components of the current time‐phasor in a rotating reference frame p‐q, oriented in such a way that the instantaneous voltage time‐phasor points to the p‐axis direction, represent the active and reactive currents. These components give rise to instantaneous real and imaginary powers, respectively. The spectral analysis of the above‐mentioned time‐phasors gives the harmonic symmetrical components of positive and negative sequence of voltage and current three‐phase systems. The line‐by‐line product of the voltage sequence spectrum by the complex conjugate of the current sequence spectrum gives the DC components of the instantaneous real and imaginary powers. The paper shows also that the instantaneous active and reactive currents are different from those defined on grounds of the Fryze's theory, which can be determined from the voltage and current sequence spectra. Copyright © 1993 John Wiley & Sons, Ltd.

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SHIPBOARD DAMAGED STABILITY ASSESSMENT - THE FLOODING CASUALTY control SOFTWARE

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 152-166页

作者： ZAHN, PB ROSBOROUGH, J CARLSTROM, R Peter B. Zahn:is a section chief in the Naval Architecture Department at Advanced Marine Enterprises. He is responsible for software development and special trials support. He has led the Flooding Casualty Control Software (FCCS) development effort since joining AME in 1989. He is also responsible for the material handling strikedown and stowage (MHS&S) software development program as well as special trials support for the ACVLAP and T-AGOS 19 programs. Prior to joining AME Mr. Zahn spent nine years with various companies of the ARCTEC Group. His experience includes field trials in venues from the Caribbean to the Bering Sea as well as model tests and engineering design and development efforts. Mr. Zahn received his B.S. in naval architecture and marine engineering from Webb Institute in 1980 and has published various papers on pollution prevention offshore systems and icebreaker design and performance. He is a member of ASNE and SNAME. John Rosborough:has been a naval architect for the Naval Sea Systems Command (NavSea) for the past 15 years. He is currently assigned to the Hydrodynamics Division with responsibility for aircraft carrier stability evaluations and as a task leader for computer-aided ship design development. In the Stability Division he was previously responsible for stability analyses on various amphibious ships SWATHs and foreign ships. He manages the upgrade and augmentation of SHCP at NavSea and is the Navy's technical point of contact for evaluating shipboard stability software and transitioning technology to the fleet. Mr. Rosborough received his B.S. in naval architecture and marine engineering from the University of Michigan in 1977. He is a member of USNI and the Association of Scientists and Engineers at NavSea. Richard Carlstrom:is a naval architect with Advanced Marine Enterprises. He has been responsible for software development in support of a variety of major programs including FCCS and SHCP and is a specialist in stability evaluations for complex ships such as CVs CVNs

The Flooding Casualty control Software (FCCS) was developed under the auspices of the Naval Sea systems Command (NavSea) and is currently being deployed on a variety of ships in the neets of both the U.S. Navy and the U.S. Coast Guard. The primary objective of FCCS is to enable damage control personnel to identify critical stability conditions, especially when related to the loss of reserve buoyancy due to battle damage and the destabilizing effects of large quantities of firefighting water, in a timely manner. FCCS was initially deploved in 1990. It utilizes the standard algorithms of the Ship Hull Characteristics Program (SHCP). The user interface was designed to allow quick familiarity for shipboard users, primarily the damage control assistant (DCA) and his staff. Intact stability evaluations include the effects of topside icing, high winds, personnel crowding, heavy lifts over the side, high speed turns, and towing. FCCS also supports ballasting analysis for amphibious ships as well as providing bottom reaction and beached stability data for grounding incidents. Bv providing a tool for the ''fuel king'' and DCA to generate the required daily updates on the current ship load and liquids status, FCCS is assured of an accurate baseline in the event of damage. The design allows the evaluation of the ultimate ship stability status for a damage event using simple compartmentation and flooding status inputs. Evaluation of the adequacy of resulting stabilitv, as well as identification of such critical stability parameters as off center loading, margin line immersion, and negative GM, are accomplished by the program. Guidance is provided for the user to initiate appropriate flooding related damage control activities. Initially fitted on USS Oliver Hazard Perry Class frigates, FCCS databases have been for the USCG Hamilton class high endurance cutters, USS Arleigh Burke class Aegis destroyers, and a variety of other U.S. Navy and U.S. Coast Guard ship classes. The progra

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DISTRIBUTED DETECTION WITH CONSULTING SENSORS AND COMMUNICATION COST

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IEEE TRANSACTIONS ON AUTOMATIC control 1992年第9期37卷 1398-1405页

作者： THOMOPOULOS, SCA OKELLO, NN Department of Electrical and Computer Engineering Decision and Control Systems Laboratory Pennslyvania State University University Park PA USA

The problem of distributed detection with consulting sensors in the presence of communication cost associated with any exchange of information (consultation) between sensors is considered. We consider a system of two sensors, S1 and S2, in which S1 is the primary sensor responsible for the final decision u0, while S2 is a consulting sensor capable of relaying its decision u2 to S1 when requested by S1. In the scenario that is considered, the final decision u0 is based either on the raw data available to S1 only, or it may, under certain request conditions, also take into account the decision u2 of sensor S2. Random and nonrandom request schemes are analyzed and numerical results are presented and compared for Gaussian and slow-fading Rayleigh channels. For each decision making scheme, an associated optimization problem is formulated whose solution is shown to satisfy certain a priori set design criteria that we consider essential for sensor fusion.

关键词： Costs Sensor fusion control systems Sensor systems Frequency Communication system control Servomechanisms Steady-state Polynomials Error correction

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Experimental study of the identification methods for an industrial robot manipulator

Experimental study of the identification methods for an indu...

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1992 IEEE/RSJ International Conference on Intelligent Robots and systems, IROS 1992

作者： Yoshida, K. Ikeda, N. Mayeda, H. Department of Control Engineering Osaka University Japan Department of Computer and Systems Engineering Ritsumeikan University Japan

ISBN: (纸本)0780307372

Two identification methods;"stepby-step method" and "simultaneous method" which takes advantage of the instrumental variable method are experimentary examined to estimate the parameters of the dynamic model of the PUMA 560. To evaluate the accuracy of the estimates we compare simulated trajectories with measured trajectory. It can be concluded that the two methods are neary same precise way to estimate the model parameters. © 1992 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Robot applications

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Visual pattern recognition using morphological methods

Visual pattern recognition using morphological methods

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1992 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 1992

作者： Papadakis, Ioannis N.M. Reisman, James G. Thomopoulos, Stelios C.A. Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University ParkPA16802 United States

ISBN: (纸本)0780305329

An effective method for visual pattern recognition using morphological techniques is presented. It is shown that it can be successfully used for the recognition of deformed letters. The method extracts morphological information by the successive dilation of an "idealized" letter set. At each stage a properly defined similarity index is computed. The maximum values of the similarity index for each stored letter are compared and are used for the classification decision. In this paper, classification results are presented for a set of deformed capital English letters with a realistic level of deformation. Skeletonization of the deformed pattern is shown to improve the performance of the classification method. The described method can be easily implemented using a parallel architecture. © 1992 IEEE.

关键词： Parallel architectures

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control of ω-automata, church’s problem, and the emptiness problem for tree ω-automata 5th

Control of ω-automata, church’s problem, and the emptiness...

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5th Workshop on computer Science Logic, CSL 1991

作者： Thistle, J.G. Wonham, W.M. Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States Systems Control Group Department of Electrical Engineering University of Toronto TorontoONM5S 1A4 Canada

ISBN: (纸本)9783540557890

Church’s problem and the emptiness problem for Rabin automata on infinite trees, which represent basic paradigms for program synthesis and logical decision procedures, are formulated as a control problem for automata on infinite strings. The alphabet of an automaton is interpreted not as a set of input symbols giving rise to state transitions but rather as a set of output symbols generated during spontaneous state transitions;in addition, it is assumed that automata can be "controlled" through the imposition of certain allowable restrictions on the set of symbols that may be generated at a given instant. The problems in question are then recast as that of deciding membership in a deterministic Rabin automaton’s controllability subset - the set of states from which the automaton can be controlled to the satisfaction of its own acceptance condition. The new formulation leads to a direct, efficient and natural solution based on a fixpoint representation of the controllability subset. This approach combines advantages of earlier solutions and admits useful extensions incorporating liveness assumptions. © Springer-Verlag Berlin Heidelberg 1992.

关键词： Forestry

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An iteration scheme for dominant singular values

An iteration scheme for dominant singular values

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1992 IEEE Symposium on computer-Aided control System Design, CACSD 1992

作者： Bar-On, J.R. Gray, C.W. Department of Electrical Engineering and Computer Science University of Oklahoma NormanOK73107 United States Control Systems Subdivision Aerospace Corporation El SegundoCA90009 United States

An iteration method is presented for determining the largest singular value (2 - norm) of a matrix, and its corresponding singular vectors. Connections with the power method, and Bernoulli's method are presented. A formula is derived which describes the relationship between a matrix perturbation and the perturbation of its singular values. © 1992 Proceedings of the IEEE International Symposium on computer-Aided control System Design.

关键词： Iterative methods

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Adaptive Neural Network control of Fes-Induced Cyclical Lower Leg Movements

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IFAC Proceedings Volumes 1992年第10期25卷 25-30页

作者： S.H. Stroeve H.M. Franken P.H. Veltink W.T.C. van Luenen Biomedical Engineering Division Department of Electrical Engineering University of Twente The Netherlands Control Systems and Computer Engineering Group Department of Electrical Engineering University of Twente The Netherlands

As a first step to the control of paraplegic gait by functional electrical stimulation (FES), the control of the swinging lower leg is being studied. This paper deals with a neural control system, that has been developed for this case. The control system has been tested for a model of the swinging lower leg using computer simulations. The neural controller was trained by supervised learning (SL) and by backpropagation through time (BTT). The performance of the controller with random initial weights was poor after training with BTT and fair after SL. BTT training of the neural controller with weights, which had been initialized by SL, resulted in good control. Training with BTT thus improved the performance of the controller that initially had been trained by SL. An adaptive neural control system based on BTT has been proposed and partially tested. The controller adapted relatively fast to the change of an important model parameter.

关键词： Adaptive control backpropagation through time biocybernetics functional electrical stimulation neural nets nonlinear control systems self-adapting systems

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Adaptive neural network control of fes-induced cyclical lower leg movements

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Annual Review in Automatic Programming 1992年 17卷 25-30页

关键词： Adaptive control backpropagation through time biocybemetics functional electrical stimulation neural nets nonlinear control systems self-adapting systems

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Experimental Study Of The Identification Methods For An Industrial Robot Manipulator

Experimental Study Of The Identification Methods For An Indu...

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IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： K. Yoshida N. Ikeda H. Mayeda Department of Control Engineering Osaka University Japan Department of Computer and Systems Engineering Ritsumeikan University Japan

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