A new criterion of high-speed protection for highVoltage transmission line based on the wavelettransform of two-end data is presented. By comparingthe Lipschitz exponent and time of the wavelet modulusmaxima of voltag...
详细信息
A new criterion of high-speed protection for highVoltage transmission line based on the wavelettransform of two-end data is presented. By comparingthe Lipschitz exponent and time of the wavelet modulusmaxima of voltages of both ends, in-zone faults andout-zone faults and switching operations can bedistinguished. Simulations are carried out for testing thecriterion, and the influences of fault locations andnoises are discussed.
To track complex multiple features in video sequences isalways a challenging problem, we present a feature-tracking algorithmintegrating feature recognition and feature match in this *** to feature attributes and rela...
详细信息
To track complex multiple features in video sequences isalways a challenging problem, we present a feature-tracking algorithmintegrating feature recognition and feature match in this *** to feature attributes and relationship among estimated features,extracted features are classifies as four types of features. Then differentquantitative matching strategies are applied to track different kinds offeatures. To verify the tracks, cross correlation test and predicted 3Dmodel based test are used to test and remove outliers. The contributionsand characters of each attribute are considered in our algorithm. Theexperimental results demonstrate the efficiency of the presented motion-tracking algorithm.
The Artificial Neural Network (ANN) has widelybeen used in the field of pattern classification. The main taskof image segmentation is to extract interested objects placedat different locations in images, so it is a ki...
详细信息
The Artificial Neural Network (ANN) has widelybeen used in the field of pattern classification. The main taskof image segmentation is to extract interested objects placedat different locations in images, so it is a kind of patternclassification problem. It can be treated as maximumlikelihood estimation problem in color image whenrepresented in color histogram. In order to improve theflexibility of the classify result in changed environment wepropose the method of training the color pattern in a neuralnetwork using the EM algorithm which is a general methodfor maximum likelihood problem. Experiment proved that itis applicable and significant.
Electric utilities are constantly planning toexpand transmission and distribution *** fact of the huge capital investmentrequired, distributed generation is viewed as abetter strategy than the traditional expensivelar...
详细信息
Electric utilities are constantly planning toexpand transmission and distribution *** fact of the huge capital investmentrequired, distributed generation is viewed as abetter strategy than the traditional expensivelarge projects development *** sited PV-dispersed systems couldhelp reducing the voltage violation ***, statistics gained from differentstudies identified the problem of power qualityas a site specific;consequently a site specificsolution should be declared. These distributedPV-systems are functioning as voltagemagnitude and/or phase support. Three single-phase PV-system are located behind the point ofvoltage violation. A feeder line with PV-systemis simulated with MATLAB to study differentviolation cases, to assess the ability ofdistributed renewable systems solving networkproblems.
A new LMS based Fourier analyzer forsinusoidal signals with time-varying amplitude isproposed. The frequency response of the proposedalgorithm in the steady state is derived in order toprovide filtering insight of the...
详细信息
A new LMS based Fourier analyzer forsinusoidal signals with time-varying amplitude isproposed. The frequency response of the proposedalgorithm in the steady state is derived in order toprovide filtering insight of the proposed adaptivealgorithm in the steady state. From numericalexperiment, it is found that the proposed methodcan track each amplitude of cosine and sinesignals much faster than the conventional LMSmethod.
In this paper we demonstrate that the dominantfrequencies and Lipschitz exponents in non-stationarv andtransitory power quality disturbances. effciently extractedfrom their wavelet transform modulus maxima (WTMM)in th...
详细信息
In this paper we demonstrate that the dominantfrequencies and Lipschitz exponents in non-stationarv andtransitory power quality disturbances. effciently extractedfrom their wavelet transform modulus maxima (WTMM)in the time-scale domain. can serve as powerfuldiscriminating features for wavelet-based classification ofthese disturbances. We also propose a comprehensive"Knowledge-based" algorithm for the training of the radialbasis function (RBF) network classifier so that at itsconvergence. the network gives both the optimal featureweight vector as well as the cluster centres and scalingwidths.
In the paper we discuss recently developed fibers called HOLEYFIBERS mid their special class called PHOTONIC CRYSTALFIBERS (PCF's). Also a new Communication and OpticalNetworking system employing Holey optical fib...
详细信息
In the paper we discuss recently developed fibers called HOLEYFIBERS mid their special class called PHOTONIC CRYSTALFIBERS (PCF's). Also a new Communication and OpticalNetworking system employing Holey optical fiber is discussed. Inthe new model of light propagation the transverse refractive indexprofile and modal electric field are decomposed using orthogonalfunctions and the results obtained are employed in creating newWDM and DWDM communication systems and their possibleutilisation in optical networks. Also a number of areas of interestin these fibers and their applications to communication systems areexplored.
This paper analyzes the performance of preraketechniques, which is proposed for the time-division duplex (TDD)code-division multiple-access (CDMA) systems, based onquarter phase-shift keying (QPSK) modulation. This an...
详细信息
This paper analyzes the performance of preraketechniques, which is proposed for the time-division duplex (TDD)code-division multiple-access (CDMA) systems, based onquarter phase-shift keying (QPSK) modulation. This analysis isunder both perfect and imperfect channel estimation, and theobtained bit error rate (BER) is simulated through Monte-Carlointegration. Then we can see the differencc of performancebetween the ideal and the nonideal prerake systems. Also we cansee the impaet of the number of paths and users.
In this paper. thcrmodynamic unit matrix analysis methodis used to research the general regulation and thermodynamicessence of the thermo-economic changes caused by the shaftgIand system. On the base of the traditiona...
详细信息
In this paper. thcrmodynamic unit matrix analysis methodis used to research the general regulation and thermodynamicessence of the thermo-economic changes caused by the shaftgIand system. On the base of the traditional thermal balancemethod, we developed a new approach for calculating the shaftgland system's thermo-economics. The new method hascharacteristics of clear concept, broad application and easypopularization Furthrmore, it is even more helpful tocomputerize the thermo-economic analsis of the thermalsystem and energy conservation on-line monitoring.
A new theory on tuning-off degree in compensationnetwork is adopted to realize direct measuring this keyparameter of power network. With high precision, themeasuring error is not more than 0.56%, with good real-timepr...
详细信息
A new theory on tuning-off degree in compensationnetwork is adopted to realize direct measuring this keyparameter of power network. With high precision, themeasuring error is not more than 0.56%, with good real-timeproperty. the measuring procedure is less than 20 *** are no interference between measuring equipments andpower network and no special communication is required. Thereal-time inspecting and measuring system of networkcontrolled by microcomputer is designed and can inspect andmeasure the tuning-off degree in a wide range of [-96%, 84%].The system can communicate with the automatic-tuningmechanism so as to take corresponding protection measures tomake power network operate safety.
暂无评论