2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590)

15-17 Sept. 2004

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  • IEEE AFRICON 2004 - Cover

    Publication Year: 2004, Page(s): 0_1
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    Publication Year: 2004, Page(s): 0_2
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  • 2004 IEEE AFRICON 7th Africon Conference in Africa - Title Page

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  • Copyright

    Publication Year: 2004, Page(s): 0_4
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  • Table of contents

    Publication Year: 2004, Page(s):i - xxii
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  • Optimisation of finite element aided design of electromagnetic devices

    Publication Year: 2004, Page(s):651 - 654 Vol.2
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    An automated system integrating a commercially available finite element analysis (FEA) package with the optimization algorithm has been developed and is used to produce a near optimum solution at a relatively short time. A detailed review of genetic algorithms is carried out. The genetic algorithm has been employed to optimise two electromagnetic devices. The first problem involves the shape optim... View full abstract»

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  • Hybrid field generator controller for optimised performance

    Publication Year: 2004, Page(s):655 - 659 Vol.2
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    Wind turbines have become widely used in the generation of electricity for battery charging. The means of voltage control is provided by power electronics. The charging voltage is maintained at 28 V throughout the generator speed range between 149 rpm and 598 rpm. Using a DC-to-AC power inverter and an AC-to-DC power converter to vary the generator excitation level does this. Varying the excitatio... View full abstract»

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    Publication Year: 2004, Page(s): 660
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  • A case study of an integrated conveyor belt model for the mining industry

    Publication Year: 2004, Page(s):661 - 666 Vol.2
    Cited by:  Papers (3)
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    The energy cost is one of the largest components of operating costs on a belt conveyor system. The majority of papers on energy savings on conveyor systems focus on the mechanical improvement of the conveyor system in order to save energy. In This work the model that was developed to simulate the energy consumption patterns of the conveyor belts will be introduced and explained by means of a case ... View full abstract»

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  • A statistical method to minimize electrical energy losses in a local electricity distribution network

    Publication Year: 2004, Page(s):667 - 673 Vol.2
    Cited by:  Papers (21)  |  Patents (3)
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    A focus area of energy management research is the reduction of electrical energy losses occurring in an electricity distribution network. These losses are the technical and nontechnical losses. Reducing these losses ensure that the cost of electricity to customers will be reduced and in turn the efficiency of the distribution network will be improved. The model developed minimizes the nontechnical... View full abstract»

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    Publication Year: 2004, Page(s): 674
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  • An investigation into the impact of a thyristor controlled series capacitor-based closed-loop power flow controller under fault conditions

    Publication Year: 2004, Page(s):675 - 681 Vol.2
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    This work presents a theoretical study into the influence of closed-loop control of AC power flow on the small-signal and transient stability characteristics of a simple study system. Both the constant power and constant angle modes of power flow control are examined for a range of controller response times. The results indicate that the effect of a power flow controller on system stability is dep... View full abstract»

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    Publication Year: 2004, Page(s): 682
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  • An optimal strategy for switching devices allocation in radial distribution network

    Publication Year: 2004, Page(s):683 - 689 Vol.2
    Cited by:  Papers (1)
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    Modern life strongly depends on the continuous supply of electrical energy, increasing interests on electrical operators and customers to power quality and service reliability issues. Emergency planning techniques need to be developed in order to satisfy European guidelines and standards on power quality levels. Restoring power supply is a complicated problem to solve especially when faults on rad... View full abstract»

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  • Tapping small amounts of power from HVDC transmission lines using parallel cascaded converters

    Publication Year: 2004, Page(s):691 - 696 Vol.2
    Cited by:  Papers (2)
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    Tapping small amounts of power from HVDC transmission lines for rural electrification, has been the desire of network planners, designers and researchers for many years. This work investigates a parallel-cascaded converter topology for tapping small amounts of power from HVDC transmission lines. Further the effect of the parallel tapping station on the main HVDC transmission link during start-up o... View full abstract»

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  • An investigation into the methodology to develop an insulator pollution severity application map for South Africa

    Publication Year: 2004, Page(s):697 - 703 Vol.2
    Cited by:  Papers (4)
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    The development of an insulator pollution severity application map (IPSAM) for South Africa is being investigated. This work discusses the results that were obtained from directional dust deposit gauges (DDG's) and equivalent salt deposit density gauges (ESDD's) across South Africa. An investigation into the effect of distance-from-seacoast on pollution severity levels is discussed. Correlations b... View full abstract»

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    Publication Year: 2004, Page(s): 704
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  • Agent technology used in power systems

    Publication Year: 2004, Page(s):705 - 710 Vol.2
    Cited by:  Papers (3)
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    Agents are believed to be an important new way of conceptualizing and implementing certain types of software applications. This work will give an overview of how intelligent agent technology can be used in power systems and power application software. At first, agent technology is briefly introduced. Thereafter, the use of agent technology is proposed for power system state estimation, database en... View full abstract»

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  • Assessment of commercially available software tools for transient stability: experience gained in an academic environment

    Publication Year: 2004, Page(s):711 - 716 Vol.2
    Cited by:  Papers (10)
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    There are many power system simulation software tools for transient stability analysis that are commercially available today. The choice of the most adequate tool for a specific type of stability analysis is a difficult task, and is influenced by economical reasons. It is imperative that a comparative study of various tools be carried out to help users make informed decisions. This work evaluates ... View full abstract»

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  • Automatic generation control performance of the Nigerian power system after deregulation

    Publication Year: 2004, Page(s):717 - 722 Vol.2
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (303 KB) | HTML iconHTML

    The current restructuring program which seeks to split the national electric power authority (NEPA) -the sole electricity supply company in Nigeria-into one transmission company, often reffered to as a Transco, and several generation and distribution companies (Gencos & Discos), is a welcome development. This paper investigates some of the technical problems associated with automatic generatio... View full abstract»

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  • Analysis of EM coupling from AC electrified railway to nearby earth return circuit

    Publication Year: 2004, Page(s):723 - 727 Vol.2
    Cited by:  Papers (1)
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    An electrified railway is an electromagnetically complex installation due to its physical size, the interaction between its constitute parts and the electromagnetic interference coupling mechanisms between these parts. The complexity of the installation requires proper management and understanding of the electromagnetic disturbance that may compromise the safety and operational integrity of the ra... View full abstract»

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  • A load shedding controller for management of residential loads during peak demand periods

    Publication Year: 2004, Page(s):729 - 734 Vol.2
    Cited by:  Papers (2)  |  Patents (1)
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    South Africa is experiencing an unprecedented increase in electricity consumption. A direct consequence of this increased demand is the enormous load burden that has been imposed on the nation's national electricity grid, especially during peak demand periods. One solution to this problem would be the construction of additional power generating facilities, at a great cost to the economy and more i... View full abstract»

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  • Model of a photovoltaic fuel-cell generator

    Publication Year: 2004, Page(s):735 - 739 Vol.2
    Cited by:  Papers (3)
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    Distributed generation (DG) system ranging in size from a few kilowatts up to 50 MW refers to a variety of small, modular power-generating technologies connected to the electric grid which combined with energy management and storage systems to improve the operation of electricity delivery systems. DG provides solutions to two long standing problems of power system operation: nonavailability at all... View full abstract»

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  • Modeling of transformer nonlinearites taking hysteresis into account with consuming function and the harmonic balance method

    Publication Year: 2004, Page(s):741 - 744 Vol.2
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    This work presents a new approach for the steady state modeling of transformer core nonlinear magnetizing characteristic in the frequency domain taking hysteresis into account. The excitation characteristics of the transformer are presented by curve fitting techniques created by normalized piecewise excitation curve and consuming functions for the representation of the hysteresis curve. The harmon... View full abstract»

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  • Utilisation of renewable energy sources in deep rural areas

    Publication Year: 2004, Page(s):745 - 748 Vol.2
    Cited by:  Papers (2)
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    An evaluation of the suitability of different renewable energy sources to supply a group of loads in a rural area is made. A computer programme with various subroutines has been developed for matching renewable energy sources characteristics with rural loads profiles, cost effectively. Both unitary and hybrid systems have been considered. It has been demonstrated that for the loads considered, an ... View full abstract»

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