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International Conference on Power System Technology (POWERCON)

作者： S.M.E. Safty H.A. Ashour H.E. Dessouki M.E. Sawaf Electrical Engineering and Computer Control Dept. Arab Academy for Science and Technology Egypt

As the voltage and current waveforms are deformed due to transient during faults, their pattern changes according to the type of fault. The artificial neural network (ANN) can then be used for fault detection due to its distinguished behavior in pattern recognition. In order to minimize the structure and timing of the ANN, preprocessing of the voltage and current waveforms was done. The data delivered from a simulated power system using PSCAD (EMTP with cad system) was used for training and testing the ANN. An experimental setup, consists of a 3 phase power supply module and transmission line module, is utilized. A set of signal conditioning circuits is designed and implemented in order to transfer data to a PC which is used as an online relay for fault detection. This is done via a data acquisition card (CIO-DAS1602/12). The Matlab program captures and processes real data for training the ANN. Applying different types of faults for testing the system, right tripping action was taken and the type of fault was correctly identified. The suggested artificial neural network algorithm has been found simple and effective hence could be implemented in practical application.

关键词： Fault detection Transmission lines Artificial neural networks Circuit faults Power transmission lines Voltage Electrical fault detection Power system simulation PSCAD System testing

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Nonlinear system identification and control design using adaptive wavelet network 6

Nonlinear system identification and control design using ada...

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6th IFAC Symposium on Nonlinear control Systems, NOLCOS 2004

作者： Karimi, H.R. Lohmann, B. Moshiri, B. Jabchdar Maralani, P. Control and Intelligent Processing Center of Excellence Dept. of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran Institute of Automation University of Bremen Otto-Hahn-Allee NW1 BremenD-28359 Germany

This paper presents an application of wavelet networks in identification and control design tor a class of non-linear dynamical systems. The technique of feedback linearization, supervisory control and H∞ control are used to design an adaptive control law and also the parameters of the wavelet networks arc adapted using a Lyapunov-based design. By some theorems, it will be proved that even in the presence of modelling errors, named network error, the stability of the overall identification scheme and the convergence of the network parameters and the boundedness of the state errors are guaranteed. Copyright © 2004 IFAC.

关键词： Feedback linearization

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Suitability review on reliability analysis of the digital plant protections system for Ulchin NPP units 5 and 6

Suitability review on reliability analysis of the digital pl...

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American Nuclear Society 4th International Topical Meeting on Nuclear Plant Instrumentation, control and Human Machine Interface Technology

作者： Jeong, Choong-Heui Goo, Cheol-Soo Lee, Cheol-Hoon Instrumentation and Control Dept. Korea Institute of Nuclear Safety P.O.Box 114 Yuseong Daejeon 305-600 Korea Republic of Dept. of Computer Engineering Chungnam National University 220 Kung-Dong Yuseong-Goo Daejeon 305-764 Korea Republic of

ISBN: (纸本)0894486888

This paper summarizes the results of the suitability review on the reliability analysis for the Digital Plant Protection System (DPPS) that were performed during the operation license for Ulchin NPP units 5 and 6. The DPPS is the first fully digitalized protection system of their kind in Korea. The reliability analysis was performed by the system designer, Westinghouse Electric Company (WEC), using, mainly, the fault tree analysis (FTA) along with failure modes and effect analysis (FMEA). During the suitability review process, licensee performed again the reliability analysis to correct for some shortcomings, such as insufficient fault tree configuration, inadequate component failure data, and inconsistent modeling method of common mode failure, identified by Korea Institute of Nuclear Safety (KINS). The result of this second round of reliability analysis was compared with analog PPS reliability of System 80. The comparison of the digital and analog PPS design showed that the reliability of digital PPS was slightly worse than that of analog PPS. So, an LCL DO Module Test was newly suggested and adapted to improve the reliability of DPPS, and then the reliability was analyzed again to reflect the new test feature. The result of this third round of reliability analysis showed that the reliability of digital PPS is actually better than that of analog PPS. Through these rigorous review processes, we were finally assured that the DPPS of Ulchin units 5 and 6 had an acceptable level of reliability.

关键词： Industrial plants

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Multitasking supervisory control of discrete-event systems 7

Multitasking supervisory control of discrete-event systems

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7th International Workshop on Discrete Event Systems, WODES 2004

作者： De Queiroz, Max H. Cury, Jose E.R. Wonham, W.M. LCMJ-DAS-Federal University of Santa Catarina Florianopolis88040-900 Brazil Dept. of Electrical and Computer Engineering University of Toronto Systems Control Group ONM5S 3G4 Canada

This paper presents an approach for functionally dealing with multiple tasks in the supervisory control of discrete-event systems (DES). The colored marking generator (CMG), a special type of Moore automaton, is introduced as a model that distinguishes classes of tasks in DES. The main results of supervisory control theory are extended to this model, allowing the synthesis of minimally restrictive supervisors, which respect the safety specifications and ensure coreachability of multiple control objectives. Reversibility is also investigated as an alternative way of ensuring liveness of multiple tasks. Two examples illustrate the convenience of this approach. © 2004 IFAC.

关键词： Discrete event simulation

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Stability of linear time invariant systems with interval fractional orders and interval coefficients

Stability of linear time invariant systems with interval fra...

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ICCC 2004 - Second IEEE International Conference on Computational Cybernetics

作者： Petráš, Ivo Chen, Yangquan Vinagre, Bias M. Podlubny, Igor Department of Informatics and Process Control BERG Faculty Technical University of Kosice B. Nemcovej 3 042 00 Kosice Slovakia Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322-4160 United States Dept. of Electronic and Electromechanical Engineering Industrial Engineering School University of Extramadura Avda. De Elvas s/n 06071-Badajoz Spain

ISBN: (纸本)0780385888

This paper considers the stability of the fractional-order linear time-invariant systems with interval type uncertainties in both fractional orders and the relevant coefficients. It is an extension of our previous result on the robust stability analysis of the interval type uncertain fractional order LTI systems with crisply known fractional orders. We have proposed a stability check procedure for uncertain LTI systems with interval fractional orders and interval coefficients. The procedure is demonstrated with some simple examples. © 2004 IEEE.

关键词： System stability

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Maximum likelihood double differential detection clarified 4

Maximum likelihood double differential detection clarified

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4th IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2003

作者： Stoica, Petre Liu, Jianhua Li, Man Department of Systems and Control Uppsala University P.O. Box 337 UppsalaSE-75105 Sweden Dept. of Electrical and Computer Engineering University of Florida P.O. Box 116130 GainesvilleFL32611 United States

ISBN: (纸本)078037858X

The maximum likelihood detector (MLD) for single differential modulation is easy to derive. On the other hand, the MLD problem associated with double differential modulation is much more complicated and solving it was deemed to require a computationally unattractive nonlinear search. Consequently a simple heuristical detector was usually preferred to the MLD, on computational grounds. In this paper we prove the somewhat unexpected result that the aforementioned heuristical detector coincides with the exact MLD. © 2003 IEEE.

关键词： Maximum likelihood

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Spectral Unmixing of Classes of Arbitrary Nonsingular Matrices

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IFAC Proceedings Volumes 2004年第21期37卷 73-78页

作者： ShiNung Ching Edward J. Davison Systems Control Group Dept. of Electrical and Computer Engineering University of Toronto Toronto Ontario M5S 1A4 Canada

It has been shown that for any nonsingular matrix M, there exists a finite set of ‘unmixing’ matrices S such that at least one member Si ϵ S will exhibit the property that MSi will be stable, i.e. MSi will be a Hurwitz Matrix. The purpose of this note is to construct such a set for the cases n = 2, 3 and for the specific case of companion matrices of arbitrary dimension. A direct application of such ‘unmixing’ matrices is in the construction of adaptive-type controllers using switching controllers.

关键词： control design Robust control Computational algorithms

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Haptic sensing and modeling of nanomanipulation with an AFM

Haptic sensing and modeling of nanomanipulation with an AFM

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Proceedings - 2004 IEEE International Conference on Robotics and Biomimetics, IEEE ROBIO 2004

作者： Fok, L.M. Liu, Y.H. Li, Wen J. Robot Control Laboratory Chinese University of Hong Kong Hong Kong Hong Kong Centre for Micro and Nano Systems Chinese University of Hong Kong Hong Kong Hong Kong Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong

ISBN: (纸本)0780386418

This paper describes a virtual reality and haptic interface between human and the Atomic Force Microscope (AFM), which allows the operator to sense and touch the surface and nanoparticles during the manipulation with an AFM tip. The tip-sample interaction forces and intermolecular forces between the tip and surface are modeled based on Lennard-Jones potential and JKR theory, respectively. Our objective is to provide a 3D virtual reality interface capable of displaying topography of surface for the users and allow them to predict the results for the manipulation. © 2004 IEEE.

关键词： Nanotechnology

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Multi-vehicle cooperative search with uncertain prior information

Multi-vehicle cooperative search with uncertain prior inform...

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Collection of Technical Papers - AIAA Guidance, Navigation, and control Conference

作者： Zhang, Chunlei Ordóñez, Raúl Schumacher, Corey University of Dayton Dayton OH 45469-0226 United States Wright-Potterson AFB Dayton OH 45433-7531 United States Dept. of Electrical and Computer Engineering United States Control Science Division Air Force Research Laboratory United States

ISBN: (纸本)1563476703

We present a possible solution for the multi-vehicle cooperative search problem that is based on the idea of surrogate optimization to adaptively identify a terrain map on-line and use it to produce decentralized controllers yielding trajectories in a coordinated manner. We establish a discrete mathematical model for the multi-vehicle cooperative search stationary target with uncertain prior information. We reformulate the Past, Present and Predicted Future (PPP) algorithm we introduced in previous work based on the new model and propose an implementation to adapt to the new scenario to incorporate uncertain prior information. Monte Carlo simulations indicate that the new implementation achieves better performance. Moreover, the scalability of the PPP algorithm is addressed. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Unmanned vehicles

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Effectiveness of naked-eye vision feedback for training human teleoperators

Effectiveness of naked-eye vision feedback for training huma...

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Asian control Conference

作者： S.R. Munasinghe Ju-Jang Lee T. Usui M. Nakamura N. Egashira Dept of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Dejean Korea Dept. of Advanced Systems Control Engineering Saga University Saga Japan Dept. of Control and Information Systems Engineering Kurume National College of Technology Kurume-City Fukuoka Japan

Effective training is essential for human teleoperators to deliver satisfactory performance in actual tasks. Teleoperation is naturally a very difficult task due to the absence of naked-eye vision that cripples the cognitive behavior of the remote operator. Camera vision somehow is not a satisfactory substitution. However, training with naked-eye vision feedback may help human teleoperators to learn how to deliver satisfactory performance when they actually interact with camera vision. This study was carried out to further investigate this hypothesis, and to quantitatively supplement it with experimental proofs. For this cause, the recently built telerobotic test-bed between KAIST (Korea) and Saga University(Japan) was reshaped to a telerobotic mini-golf system, which is the trial experiment in this study. The performance of the players with and without naked-eye training was compared and quantitatively evaluated. The effectiveness of training with naked-eye vision was verified as an essential part in training human teleoperators.

关键词： Feedback Humans Teleoperators Telerobotics Cameras Testing Internet Graphics computer science control engineering

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