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检索条件"机构=Dept. Control and Computer Engineering"

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On-line fault detection of transmission line using artificial neural network

On-line fault detection of transmission line using artificia...

引用

International Conference on Power System Technology (POWERCON 2004)

作者： El Safty, SM Ashour, HA El Dessouki, H El Sawaf, M Electrical Engineering and Computer Control Dept. Faculty of Engineering Arab Academy for Science and Technology Egypt

ISBN: (纸本)0780386108

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 on-line 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： Electric current measurement

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Towards new real-time processor: The multioperand MSB-first real-time adder

Towards new real-time processor: The multioperand MSB-first ...

引用

Proceedings of the EUROMICRO Systems on Digital System Design, DSD 2004

作者： Kuspriyanto Kerlooza, Yusrila Y. Lab. of Computer and Control System Dept. of Electrical Engineering Bandung Institute of Technology Hardware Laboratory Dept. of Computer Engineering Indonesian Computer University

ISBN: (纸本)0769522033

Arithmetic operation's execution time in real-time system is bounded by deadlines. The method commonly used to meet these deadlines is by employing any suitable process-scheduling algorithm, which may contain a potential weakness. If time needed to operate is longer than its deadline, then the result's quality will be poor. This is mainly caused by the algorithms of the arithmetic operations commonly used nowadays do not choose the most significant data to be processed first. This research tries to design new algorithm and its processing unit that works based on real-time principles, which starts its computation process from the highest valued digit and provides its intermediate-results that can be accessed anytime during the process. Designing tool used in this research is MAX+plus II Baseline 10.2 software. This research accomplishes in showing the performance of the new algorithm and its processing unit, which is better than the performance of the conventional algorithm.

关键词： Real time systems

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Camera calibration technique by pan-closeup exposures for industrial vision metrology 20

Camera calibration technique by pan-closeup exposures for in...

引用

20th ISPRS Congress Technical Commission V

作者： Imoto, Harutaka Hattori, Susumu Akimoto, Keiichi Ohnishi, Yuzo Dept. of Production Technology Development Ishikawajima-Harima Heavy Industries Co. Ltd. Yokohama Japan Dept. of Computer Science Fukuyama University Fukuyama Japan Dept. of Control Engineering Shikoku Polytechnic-College Marugame Japan School of Urban and Environment Engineering Kyoto University Kyoto Japan

A high precision and easy-to-use CCD camera calibration technique for industrial vision metrology is discussed. A well-known method is self-calibration by convergent camera configuration of a two- or three-dimensional target field. Only with this technique the central part of a sensor area is precisely calibrated, but off the centre the precision rapidly deteriorates. The presented technique is a simultaneous adjustment of both pan and close exposures, which compensates the lack of distortion data in the fringe area of the sensor and offers both uniform and high-precision calibration. Some patterns of camera configuration are compared in an experiment in terms of the precision and its uniformity over the sensor. And the combination of convergent pan exposures and vertical close exposures is proved the best. © 2014 ISPRS. All Rights Reserved.

关键词： Calibration

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Reference wave generation in dynamic voltage restorers by use of PQR power theory

Reference wave generation in dynamic voltage restorers by us...

引用

19th Annual IEEE Applied Power Electronics Conference and Exposition - APEC 2004

作者： Kim, Hyosung Lee, Sang-Joon Sul, Seung-Ki Dept. of Control Engineering Cheonan National Technical College Korea Republic of Sch. of Elec. Eng./Computer Science Seoul National University Korea Republic of

Dynamic voltage restorer (DVR)s are known as effective and economic means to compensate for voltage sags and swells [1]-[11], This paper proposes a novel method to generate reference waves synchronized with the grid whether or not the line voltages are distorted by a fault. The proposed reference wave generator (RWG) looks for the normal voltage waveforms in the grid from the corrupted line voltages and synthesizes the expected positive sequence reference waves for DVRs. There is no transient problem on the generated reference waves when the line voltages are distorted by faults. Experimental results verified the proposed theory very well.

关键词： Electrical engineering

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Nonlinear system identification and control design using adaptive wavelet network 6

Nonlinear system identification and control design using ada...

引用

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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Online fault detection of transmission line using artificial neural network

Online fault detection of transmission line using artificial...

引用

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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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...

引用

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

引用

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...

引用

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

引用

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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