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WESCANEX 93. 'Communications, Computers and Power in the Modern Environment.' Conference Proceedings., IEEE

Date 1993

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Displaying Results 1 - 25 of 61
  • Performance evaluation of flexible manufacturing systems using factorial design techniques

    Publication Year: 1993, Page(s):407 - 415
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (775 KB)

    The authors present the results of a simulation study of a flexible manufacturing system (FMS). The FMS considered includes ten machining centers capable of performing a variety of tasks, an automated guided vehicle (AGV) based material handling system, and an automated single-input-single-output storage-retrieval system connected to the manufacturing system by conveyors. The system manufactures a... View full abstract»

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  • Codebook searching for 4.8 kbps CELP speech coder

    Publication Year: 1993, Page(s):397 - 406
    Cited by:  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    The authors describe an implementation of fast algorithms for codebook searching used in code-excited linear predictive (CELP) speech coding. They present details of the algorithms including (i) fast conversion of line spectrum pair parameters to linear predictive coding parameters, and (ii) fast searches of the parameters of adaptive and stochastic codebooks. The description can be readily used f... View full abstract»

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  • A stiffness control schema for perturbed and unperturbed joint movement

    Publication Year: 1993, Page(s):392 - 396
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (345 KB)

    A model for controlling the position of a joint is presented. The model is based on the stiffness control strategy which is supposed to play an important role in the control of both human posture and human movement. To compensate for the effect of external disturbances, a feedforward mechanism is used in the model. Two cases are considered: unperturbed, inertial-visco-stiffness loaded movements, a... View full abstract»

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  • Real-time dynamic arithmetic coding for low bit-rate channels

    Publication Year: 1993, Page(s):381 - 391
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (987 KB)

    The authors present an implementation and thereby demonstrate the capability of real-time and dynamic arithmetic coding in low-bit-rate serial communications channels. Data files from disk and text entered from the keyboard were compressed in real time using dynamic arithmetic coding. Each character in the source stream was compressed and an arithmetic code stream formed. The code stream was trans... View full abstract»

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  • Multiresolution 2-dimensional edge analysis using wavelets

    Publication Year: 1993, Page(s):376 - 380
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (385 KB)

    The authors show that wavelet transforms can be used in an empirical way to improve edge-detected pictures. Specifically, the first derivative of a Gaussian distribution function is used as the wavelet for detecting edges. The wavelet transforms are calculated using integer scales instead of dyadic scales. This empirical approach is justified by comparing the method with an exact reconstruction pr... View full abstract»

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  • Speech and image signal compression with wavelets

    Publication Year: 1993, Page(s):368 - 375
    Cited by:  Papers (11)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (766 KB)

    The authors consider time-frequency multiresolution analysis based on wavelets, as it applies to speech/audio and image/video signal compression. They compare the wavelet analysis to the traditional short-window techniques used in signal compression. The performance of the discrete wavelet transform in terms of the bit rates and signal quality is comparable to that for other techniques such as the... View full abstract»

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  • A microprocessor-based relay for parallel transmission lines

    Publication Year: 1993, Page(s):362 - 367
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    A digital algorithm for the protection of parallel lines has been implemented with a 16-b single board computer. The relay was tested on a physical model consisting of two synchronous machines connected to a double circuit line. The algorithm is based on the comparison between currents of two circuits. Details of the experimental setup and the test results for various operating conditions are give... View full abstract»

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  • Study of amplitude comparison for protecting transmission lines

    Publication Year: 1993, Page(s):356 - 361
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (370 KB)

    The authors present the design of an amplitude comparator. Its operating and restraining signals were formed from those of the Mho relay. Mathematical equations describing the behavior of the phase and amplitude comparators are derived. The characteristics of the phase comparator and its equivalent amplitude comparator are analyzed. The comparators were implemented using the Texas Instruments' TMS... View full abstract»

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  • Testing dynamic characteristics of overcurrent relays

    Publication Year: 1993, Page(s):350 - 355
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (535 KB)

    Test methods for determining the dynamic characteristics of an overcurrent relay are discussed. By dynamics is meant the response of the relay to a current of varying magnitude. The test method, originated by IREQ, is used by Hydro Quebec to determine the ability of new relays to coordinate with the installed base of induction relays. Concurrent with this work, working group G7 of the Power System... View full abstract»

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  • A modeling approach for digital protection of synchronous generators

    Publication Year: 1993, Page(s):345 - 349
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    The authors describe the development of an algorithm for detecting internal faults in the windings of synchronous generators. The fault detection algorithm is based on the positive- and negative-sequence models of the synchronous machine. The algorithm uses voltages and currents at the generator terminals to detect the faults. The performance of the proposed algorithm was tested using data recorde... View full abstract»

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  • Transformer overload with user-defined characteristic

    Publication Year: 1993, Page(s):340 - 344
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB)

    The authors describe the design and implementation of a transformer overload relay with a user-defined characteristic using a user-accessible software protection system platform which has been developed at the University of Manitoba. The relay design platform is a powerful tool for the user to design his or her own relays. With the background program provided, where many relay function routines ha... View full abstract»

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  • Improved sensitivity and security for distribution bus and feeder relays

    Publication Year: 1993, Page(s):337 - 339
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB)

    Traditional protective equipment does not adapt readily to distribution system reconfiguration. If new settings are needed they have to be manually changed: there are no settings in reserve. The time to make or enter and test new settings slows down emergency responses and risks human error. Sometimes relay settings are not changed for emergency or abnormal switching, because it takes too long or ... View full abstract»

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  • Parallel processing for power system security assessment with open system techniques

    Publication Year: 1993, Page(s):330 - 336
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    An open systems environment for security assessment is described. Multiple contingency cases of power systems are preprocessed by qualitative analysis techniques of artificial intelligence to get the independent double contingency emergency set. The double contingency cases can be assessed in parallel on open workstation systems of different vendors with multiple operating systems. Tests on an exa... View full abstract»

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  • A fractal block coding technique employing frequency sensitive competitive learning

    Publication Year: 1993, Page(s):320 - 329
    Cited by:  Papers (5)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (922 KB)

    The authors discuss a block oriented fractal coding technique for still images based on contractive affine transformation theory. A brief overview of the generalized technique is provided and a number of its attractive as well as less favorable features are discussed. In particular, the high order of computational complexity associated with the technique is addressed. A neural network paradigm kno... View full abstract»

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  • Neural equalization of communication channels

    Publication Year: 1993, Page(s):313 - 319
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (675 KB)

    The authors describe the use of a dynamic model of the biological neuron called the dynamic neural unit (DNU) and examine briefly how it can be used in a channel equalization problem. The DNU, which comprises an infinite impulse response (IIR) structure followed by a nonlinear activation function, is used to obtain an inverse model of unknown channel dynamics. Once a unity mapping from output to i... View full abstract»

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  • Image compression using learning vector quantization

    Publication Year: 1993, Page(s):299 - 312
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1776 KB)

    The authors present a study and implementation of still image compression using learned vector quantization (LVQ). Kohonen's self-organizing feature map (SOFM) has been used to compress several still monochrome images by a compression ratio of 16:1 at a compression rate of 0.5, while maintaining a peak signal-to-noise ratio (PSNR) of about 30 dB. C programs were written to implement learning, comp... View full abstract»

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  • Modeling and control of flexible space structures using neural networks

    Publication Year: 1993, Page(s):291 - 298
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (589 KB)

    The authors present some preliminary studies in the field of on-orbit modeling and intelligent control technique for flexible space structures using the neutral network approach. The discussions include the state of the art in three areas: (i) on-orbit learning modeling of flexible dynamics using neutral networks, (ii) neutral learning and a control scheme for flexible space structures, and (iii) ... View full abstract»

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  • IEEE WESCANEX 93. Communications, Computers and Power in the Modern Environment Conference Proceedings (Cat. No.93CH3317-5)

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (19 KB)
    Freely Available from IEEE
  • Protection scheme considerations for common generator bus configurations used in cogeneration plants

    Publication Year: 1993, Page(s):1 - 6
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (457 KB)

    The author discusses the applications of protective relaying schemes in modern power cogeneration plants with common generator bus arrangements. Main protection system philosophy and scheme characteristics are considered. Emphasis is given to the attributes of common generator bus configurations. High resistance neutral grounding protection sensitivity and coordinate ability are addressed. Critica... View full abstract»

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  • Protection and telecommunications interface problems for digital transfer relays

    Publication Year: 1993, Page(s):7 - 14
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (499 KB)

    The authors discuss a protection application on SaskPower's S3B line in which communications propagation time asymmetry could have resulted in false tripping of the line current differential protection scheme for out of zone faults and load currents. A line differential scheme was chosen as the secondary protection. Modern line differential relays which require the transfer of digitized quantities... View full abstract»

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  • Filtering for protective relays

    Publication Year: 1993, Page(s):15 - 23
    Cited by:  Papers (55)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (831 KB)

    The authors identify filtering requirements or criteria for different relays. They limit the discussion to relays needing precise measurements of the system-frequency component of the signals, such as distance relays. Many different filtering methods which may meet the filtering requirements are conceived and reviewed. Filtering questions are answered through requirement-assessment, analysis, simu... View full abstract»

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  • A method to improve digital algorithms for protecting power systems

    Publication Year: 1993, Page(s):24 - 28
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB)

    The authors present a technique for estimating phasors representing sinusoidal signals from outputs of a pair of orthogonal filters. The technique is general in nature and can be applied to improve the performance of any signal processing algorithm. Test results that demonstrate the effectiveness of the proposed technique when applied to the Mann and Morrison and least error squares algorithm are ... View full abstract»

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  • 'Open' systems relaying

    Publication Year: 1993, Page(s):29 - 35
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (646 KB)

    The authors describe a development in relaying hardware and philosophy which has been made possible by DSPs and industrial grade PCs. The goal of an open relaying philosophy can be realized. The utility would be able to choose its relaying functions to suit its particular requirements. Details are given of a prototype design capable of being assembled and configured by a utility. Results of tests ... View full abstract»

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  • Effect of GIC on overcurrent protection for filter banks

    Publication Year: 1993, Page(s):36 - 42
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (522 KB)

    The authors describe a simulation model which can be used to predict voltages and currents during GIC (geomagnetically induced current) events for the 500 kV line and system in the Manitoba Hydro network. The results from the model are shown to be in close agreement with a recently recorded GIC event. The model is then used to predict waveforms for a possible maximum GIC level combined with differ... View full abstract»

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  • Testing 500 kV line relays for a series compensation upgrade

    Publication Year: 1993, Page(s):43 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (601 KB)

    The authors describe tests on the relays on a long 500 kV AC line carried out on site using the real-time digital simulator developed by the Manitoba HVDC Research Centre. The purpose of the tests was to examine the relay behavior when series compensation is inserted in the line in 1993. New settings for the relays have been found which will give adequate cover for all faults although some faults ... View full abstract»

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