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检索条件"机构=Center of Excellence: Control and Intelligent Processing"

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Current transformer saturation detectors for busbar differential protection

Current transformer saturation detectors for busbar differen...

引用

International Universities Power Engineering Conference (UPEC)

作者： H. Dashti M. Sanaye-Pasand M. Davarpanah Control and Intelligent Processing Center of Excellence ECE School University of Tehran Iran

Busbar differential relays may operate incorrectly due to current transformer (CT) saturation. In this paper two different techniques are suggested to detect CT saturation. The first proposed algorithm is based on the fact that the wave shape of the CT secondary current is changed significantly at the instant of the saturation. Based on this feature, an algorithm which uses second derivative of CT output current is developed. The second proposed method utilizes the zero crossing principle. It compares the predicted and measured zero crossing of the current signal. The proposed method is able to detect even small CT saturation events. A real 400 kV busbar is simulated using PSCAD/EMTDC for evaluating performance of the proposed algorithms. Obtained results demonstrate the precise operation of the both proposed algorithms in different conditions.

关键词： Current transformers Detectors Protection Fault currents Circuit faults Protective relaying Shape Current measurement Event detection PSCAD

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Studying effect of location and resistance of inter-turn faults on fault current in power transformers

Studying effect of location and resistance of inter-turn fau...

引用

International Universities Power Engineering Conference (UPEC)

作者： Farzad Zhalefar M. Sanaye-Pasand Control and Intelligent Processing Center of Excellence ECE School University of Tehran Iran

Inter-turn (turn-to-turn) fault is one of the most important failures which could occur in power transformers. This phenomenon could seriously reduce the useful life length of transformers. Meanwhile, transformer protection schemes such as differential relays are not able to detect this kind of fault. This type of fault should be studied carefully to determine its features and characteristics. In this paper the effect of fault location and fault resistance on the amplitude of fault current is studied. It is found that change of fault location along the winding has considerable effect on fault current amplitude. It would also be shown that, even small fault resistance could have major effect on fault current amplitude. In this paper, a real 240/11 kV, 27 MVA transformer is used for simulation studies.

关键词： Fault currents Power transformers Circuit faults Fault detection Power transformer insulation Protection Protective relaying Fault location Power system simulation Surges

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An adaptive distance scheme for double circuit line protection

An adaptive distance scheme for double circuit line protecti...

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International Universities Power Engineering Conference (UPEC)

作者： M. Sharifzadeh M. Sanaye-Pasand Control and Intelligent Processing Center of Excellence ECE School University of Tehran Iran

An adaptive scheme for parallel line protection is described in this paper. This scheme uses line operation status prepared based on the field data, to adjust its zone limits in a way to achieve maximum coverage and mal-operation free behaviour. When the status signals are not available a worst case zone characteristic is used. The performance of the scheme has been tested using a simulated network and the results are presented.

关键词： Protective relaying Programmable control Adaptive control Power system protection Mutual coupling Voltage Power system reliability Impedance measurement Circuit faults Process control

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A New Approach to Automatic Classification of the Curved Chromosomes

A New Approach to Automatic Classification of the Curved Chr...

引用

International Symposium on Image and Signal processing and Analysis

作者： Mehrsan Javan-Roshtkhari S. Kamaledin Setarehdan Control and Intelligent processing center of Excellence ECE University of Tehran Tehran Iran

ISBN: (纸本)9531841160;97

In this paper, an effective algorithm for chromosome image processing for straightening the curved chromosomes is presented. This is a very helpful procedure which extends the domain of success of most of the previously reported algorithms to highly curved chromosomes. The procedure is based on the calculation and analyzing the vertical and horizontal projection vectors of the binary image of the chromosome. The binary image is obtained by thresholding the input image after histogram modification. When applied to the real chromosome images the proposed algorithm could straighten all of the highly bent curved chromosomes within the image dataset. To assess the effectiveness of proposed algorithm, a neural network based chromosome classification system is developed. Wavelet transform domain features are extracted and used in an MLP structure for this purpose and a classification rate of 95.3% is obtained.

关键词： Biological cells Feature extraction Signal processing algorithms Image analysis Wavelet transforms Process control intelligent control Microscopy Software packages Java

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Basic Movements of a Nonholonomic Wheel-Based Pole Climbing Robot

Basic Movements of a Nonholonomic Wheel-Based Pole Climbing ...

引用

2007 IEEE/ASME International Conference on Advanced intelligent Mechatronics, Pages 805-1210

作者： Sara Mahdavi Ehsan Noohi Majid Nili Ahmadabadi Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran

ISBN: (纸本)9781424412631;1424412633

Three basic movements for path planning of a nonholonomic wheel-based pole climbing robot, UT-PCR, are proposed. In order to simplify the system equations, the state equations are first derived in the velocity space in which the nonholonomic constraint is easily shown. Subsequently, according to the derived equations, three basic movements are defined and a suitable control method is proposed. Finally, the proposed movements and the control method are tested via simulations.

关键词： Climbing Robot Nonholonomic Systems Basic Movements

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A New Split and Merge Algorithm for Structure Identification in Takagi-Sugeno Fuzzy Model

A New Split and Merge Algorithm for Structure Identification...

引用

International Conference on intelligent Systems Design and Applications (ISDA)

作者： Ahmad Kalhor Babak N. Araabi Caro Lucas Control and Intelligent Processing Center of Excellence School of Electronical and Computer University of Tehran Iran

In this paper a novel algorithm for structure identification of Takagi-Suegno (TS) fuzzy models based on split and merge clustering is purposed. In this algorithm, by using a sequential split procedure on data space, initial Gaussian functions as constructor blocks are created. By merging these initial blocks, new composite validity functions for locally linear models with a high degree of flexibility are estimated. The proposed algorithm results in TS-type locally linear fuzzy models with an abstract structure as well as high generalization. Desirable performance of this algorithm is illustrated at case study section.

关键词： Takagi-Sugeno model Clustering algorithms Fuzzy systems intelligent structures Fuzzy control Cost function Parameter estimation Iterative algorithms Shape Partitioning algorithms

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On optimal wavelet transform for watermarking

On optimal wavelet transform for watermarking

引用

International Symposium on Signal processing and Its Applications (ISSPA)

作者： Alireza Nasiri Avanaki Shahrooz Faghih Roohi Control and Intelligent Processing Center of Excellence School of ECE University of Tehran Tehran Iran

ISBN: (纸本)9781424407781;1424407796

In this paper, we propose a method of improving imperceptibility and robustness of a wavelet-based watermark by finding the optimal wavelet transform used for image decomposition required for watermark embedding. Our approach can be easily generalized for enhancing watermarking performance of any wavelet-based technique as they usually use predefined (not necessarily optimal) wavelets. We measured imperceptibility by PSNR and considered robustness to filtering or JPEG compression. To find the optimal wavelet, we used both local and global (genetic algorithm) optimizers. We applied our method to a recent wavelet-based watermarking scheme and achieved better watermarking properties both in terms of imperceptibility and robustness.

关键词： Wavelet transforms Watermarking Robustness Discrete wavelet transforms Filter bank Finite impulse response filter Genetic algorithms PSNR Image reconstruction Hydrogen

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Designing a home security system using sensor data fusion with DST and DSmT methods

Designing a home security system using sensor data fusion wi...

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FUSION 2007 - 2007 10th International Conference on Information Fusion

作者： Behzad Moshiri Khalkhali, Arezou Moussavi Reza Momeni, Hamid Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran Faculty of Post Graduate Islamic Azad University Southern Unit Tehran Iran Department of Electrical Engineering Tarbiat Modarres University Tehran Iran

ISBN: (纸本)0662478304

Today due to the importance and necessity of implementing security systems in homes and buildings with the capability of higher certainty and lower cost, sensor fusion methods as applicable and high performance methods are attracting the researchers' attention. In this paper, the application of Dempster-Shafer evidential theory and the more general and newer one Dezert-Smarandache theory for implementing a home security system using sensor data fusion have been considered. The benefits of multisensor fusion in comparison with the traditional single sensor systems or systems in which any sensor itself connects to the control unit have been shown.

关键词： Sensor data fusion

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Locating Information Maximization Time in EEG Signals Recorded During Mental Tasks

Locating Information Maximization Time in EEG Signals Record...

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International Symposium on Image and Signal processing and Analysis

作者： F. Abdollahi S.K. Setarehdan A. M. Nasrabadi Control and Intelligent Processing Center of Excellence University of Tehran Iran Shahed University Tehran Iran

ISBN: (纸本)9531841160;97

Brain-Computer interfacing systems require online processing of electroencephalogram (EEG) signals. Therefore, high speed signal processing is of great importance in BCI systems. In this study, we suggest and calculate a time pattern for information variations within the EEG signal recorded during mental tasks. Therefore, it is possible to limit the length of the EEG signal from beginning up to the information maximization point, hence reducing the processing time. In this work Wavelet entropy is employed for information content evaluation of the EEG signal.

关键词： Electroencephalography Entropy Signal processing Electrooculography Data mining Signal analysis Process control control systems intelligent control Biomedical engineering

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Finding Nash Equilibrium Point of Nonlinear Non-cooperative Games Using Coevolutionary Strategies

Finding Nash Equilibrium Point of Nonlinear Non-cooperative ...

引用

International Conference on intelligent Systems Design and Applications (ISDA)

作者： Kamran Razi Saied Haidarian Shahri Ashkan R. Kian Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Iran

In this paper a coevolutionary algorithm is developed to find the Nash equilibrium (NE) points of nonlinear games. Using the global search property of the evolutionary strategy enables the proposed algorithm to find the admissible NE and escape from trapping in local optimums. Several numerical examples are presented to show the effectiveness of this method for both dynamic and static games.

关键词： Nash equilibrium Game theory Design engineering Iterative algorithms intelligent systems Application software Nonlinear control systems Process control control systems intelligent control

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