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Electrical and Computer Engineering, Canadian Journal of

Issue 4 • Date Nov. 1990

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Displaying Results 1 - 12 of 12
  • Canadian Journal of Electrical and Computer Engineering - Front cover

    Publication Year: 1990 , Page(s): c1
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  • Inside front cover

    Publication Year: 1990 , Page(s): c2
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  • Table of contents

    Publication Year: 1990 , Page(s): 1
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  • An intelligent self-improving control strategy and its microprocessor-based implementation for application to a hydro-turbine governing system

    Publication Year: 1990 , Page(s): 130 - 138
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    The intelligent self-improving control strategy, containing a controller with variable structure and parameters, a knowledge base and a detector/identifier, has been developed and implemented on a multiprocessor-based system. A digital emulator was built to test the control strategy. The proposed control strategy has been applied to a hydro-turbine governing system. Test results show that the proposed control strategy realized self-improvement for start-up, no-load and load operation. View full abstract»

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  • McMaster University: Research openings at the Communications Research Laboratory

    Publication Year: 1990 , Page(s): 139
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  • A procedure for estimating the overall system worth associated with generating unit refurbishment

    Publication Year: 1990 , Page(s): 140 - 148
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    Quantitative reliability evaluation is an important element in power system planning and operation and the indices generated can be used to make a wide variety of planning decisions. The paper presents a comprehensive and basic approach to recognizing the impacts of generating unit unavailability on expected energy production costs, expected failure costs and capacity costs. The procedure is energy-based and utilizes an interrupted energy assessment rate applicable to the consumers served by the system to incorporate the expected load curtailment costs. The worth of generating unit refurbishment is assessed in terms of overall system costs. The cost of any specific unit refurbishment can be compared with the resulting net benefits and used to make decisions. View full abstract»

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  • Structural and parametric estimation of turboalternators using minimal implementation of step responses

    Publication Year: 1990 , Page(s): 149 - 157
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3084 KB)  

    A method to achieve a discrete minimal realization of the synchronous machine from step responses is proposed. It is based upon a singular decomposition of the Hankel matrix associated with these empirical observations and it is therefore, an extension of the classical Ho-Kalman (1965) algorithm. The strategies are discussed for the determination of the order of the machine with respect to the desired model complexity and the unavoidable errors on the data. When the matrices are obtained, the static admittances matrices are deduced prior to the operational matrices. If the real machine is nonlinear or of infinite dimension, a minimally reduced order linear model is obtained which approximate the transient response. View full abstract»

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  • Soft switching choppers: A study by the equivalent soft switching cell method

    Publication Year: 1990 , Page(s): 158 - 166
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    The switching cell concept was first introduced and used in order to study the micro-phenomena involved in the switching process; parasitics' influence, switching losses, snubbers, soft switching principle and so on. The authors demonstrate that the switching cell can also be a very efficient tool in the study of various converter topologies. As examples, two soft switching cells that can be used in any DC-DC converter are described. They give the quantitative study and show how the study of a single switching cell leads to a thorough knowledge of a whole set of converters, especially their open loop output characteristics and the design. View full abstract»

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  • Overload and voltage control of power systems by line switching and generation rescheduling

    Publication Year: 1990 , Page(s): 167 - 173
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    Presents of fast mathematical technique for solving security related problems in the steady-state operation of a power system. Both thermal overloads of transmission elements and nodal voltage violation problems are dealt with. In order to minimize the increase in operating costs, priority is given to the rescheduling of the network topology; however, the real and reactive power generation outputs and tap position of voltage transformers are also considered. A new network topology is determined by a set of distribution factors that relate the violating constraints to the transmission elements. The remaining control variables are determined by sensitivity analysis techniques. The violating constraints are reduced in steps so that, at any point during the computation, the most recent operating point is better than the previous one. The proposed algorithm has been implemented and tested on 24- and 118-bus power systems. View full abstract»

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  • Calculation of phasor fields around A.C. transmission lines using temporal and spatial complex variables

    Publication Year: 1990 , Page(s): 174 - 179
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1054 KB)  

    The field variables (potentials and induced voltages, electric and magnetic fields) in the neighborhood of AC transmission lines are periodic functions of time and can be represented by phasors or temporal complex variables. At the same time, the point in space can be represented by a position vector, a spatial complex variable, and the field quantity as a function of that spatial complex variable. Thus, phasor fields appear as complex variables both in relation to time and space. The use of temporal and spatial complex variables has the advantages of regular complex variables: simple analytical formulations and derivations, and generalizations of real variable procedures (e.g. Taylor series expansions and closed form integration). As an application, the paper presents the calculation of inductive and capacitive effects of a three phase overhead line on a parallel telecommunication line. View full abstract»

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  • [Back inside cover]

    Publication Year: 1990 , Page(s): c3
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  • [Back cover - [advertisement]]

    Publication Year: 1990 , Page(s): c4
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Aims & Scope

The role of the Canadian Journal of Electrical and Computer Engineering is to provide scientific and professional activity for its members in Canada, the CJECE complements international journals and will be of particular interest to anyone involved in research and development activities in the field of electrical and computer engineering.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Dr. Shahram Yousefi
Dept. of Electrical and Computer
     Engineering
Queen's University