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Universities Power Engineering Conference, 2004. UPEC 2004. 39th International

Date 6-8 Sept. 2004

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  • 39th International Universities Power Engineering Conference 2004

    Publication Year: 2004, Page(s): 0_1
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    Publication Year: 2004, Page(s): 0_2
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  • 39th International Universities Power Engineering Conference (IEEE Cat. No. 04EX858)

    Publication Year: 2004
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  • Authors index

    Publication Year: 2004, Page(s):xxxiv - xl
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  • Development of harmonic measuring system using PIC

    Publication Year: 2004, Page(s):929 - 933 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (659 KB)

    A harmonic measurement has been carried out in a building of a university campus. The measurement and an EMTP simulation make clear that the 7th harmonic is the maximum and it is caused by a resonance between compensation capacitors of ballasts for mercury lamps and an inductance of the distribution line. Time-dependency of the harmonic is also observed. A simple and cost-effective harmonic measur... View full abstract»

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  • Voltage dip ride-through control of direct-drive wind turbines

    Publication Year: 2004, Page(s):934 - 938 vol. 2
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (692 KB)

    With an increasing amount of wind energy installed, the behaviour of wind turbines during grid disturbances becomes more important. Grid operators require that wind turbines stay connected to the grid during voltage dips. This contribution presents a controller that can be used to keep direct-drive wind turbines with permanent magnet generator connected to the grid during voltage disturbances. The... View full abstract»

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  • Real-time assessment of differential relay protection on marine more-electric systems

    Publication Year: 2004, Page(s):939 - 943 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (829 KB)

    The development of more-electric environments in marine systems has been growing significantly in recent years. A primary driver for this growth has been the technological feasibility and recognised benefits that integrated full electric propulsion (IFEP) systems offer over more traditional mechanical propulsion systems. Simulation models are essential in supporting the development of IFEP systems... View full abstract»

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  • Study of the direction of the harmonic injections in the electrical power systems

    Publication Year: 2004, Page(s):944 - 947 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (556 KB)

    A simple measurement of a harmonic current in an unspecified point of the network cannot detect the transit direction of this current. The characterization of the harmonic currents flow direction harmonic currents requires a solid criterion, which will easily identify the real direction of these currents, consider their effects and then attenuate them. The criterion which seems to satisfy these re... View full abstract»

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  • Voltage sag analysis on three phase systems using wavelet transform and probabilistic neural network

    Publication Year: 2004, Page(s):948 - 952 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (706 KB)

    The ever growing diffusion of susceptible loads in power system result in increasing susceptibility to power quality problems. For this reason power quality data are recorded by utilities with the aim of identifying the origins of these disturbances in order to improve the reliability of the electrical system and thus to reduce their impact on customers. In this paper a classification algorithm fo... View full abstract»

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  • Method of critical distances for stochastic assessment of voltage sags in a meshed distribution system

    Publication Year: 2004, Page(s):953 - 956 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (536 KB)

    This paper is concerned with the method of critical distances for stochastic assessment of voltage sags in a large complicated distribution system. As the system is meshed, the method of critical distances is extended. Critical percentage of the feeders is developed from the critical distance in convenience to use the data provided by the industrial customer. The three phase short circuit faults i... View full abstract»

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  • Influence and analysis of voltage sags on electric power systems for industrial plants

    Publication Year: 2004, Page(s):957 - 960 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (597 KB)

    Electric power system of general industrial plants usually has many induction motors as loads. The influence of voltage sags can cause big disturbances on the system, depending upon the kind and composition of the loads, like having large induction motors which display constant power characteristics for fluctuation of voltage. Analysis and simulation software for electric power system analysis is ... View full abstract»

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  • The impact of small embedded generation within the UK electricity market

    Publication Year: 2004, Page(s):961 - 965 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (823 KB)

    Worldwide, the electricity industry is undergoing a period of sustained change. Pressures introduced by market reform and environmental imperatives have moved investment from large fossil fuel and nuclear plants to smaller distributed embedded systems. The UK market has reflected these changes by the introduction of the New Electricity Trading Arrangements (NETA) and by the publication of the Gove... View full abstract»

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  • An overview of voltage sag theory, effects and equipment compatibility

    Publication Year: 2004, Page(s):966 - 972 vol. 2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (903 KB)

    In the modern industrial world, many electronic and electrical control devices are part of automated processes, to increase energy efficiency and productivity. Due to the fact that most of these devices are designed with the use of modern power electronics, they are characterized by an extreme sensitivity on power quality variations. This paper describes an overview of the theory and effects of vo... View full abstract»

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  • New system harmonic indices for power quality assessment of distribution networks

    Publication Year: 2004, Page(s):973 - 977 vol. 2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (622 KB)

    This paper deals with the harmonic indices and gives considerations about their random behavior; the indices taken into account refer to the entire electrical distribution system. System indices are useful metrics to qualify distribution systems (or a part of it) and are able to take into account different quality service aspects. Indices not yet introduced in the standards and recommendations are... View full abstract»

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  • Influences of dispersed generation on the performance of the electricity grid

    Publication Year: 2004, Page(s):978 - 982 vol. 2
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (871 KB)

    Dispersed generation (DG) is playing an increasing role in the electric power system. In order to investigate the influences of DG-units on the performance of the electricity grid, performance-indicators and their classification are useful to be defined. These classifications enable an objective evaluation of the current situation in the grid and the influences of dispersed generation. This paper ... View full abstract»

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  • Quality of the power network as affected by the penetration of distribution generation

    Publication Year: 2004, Page(s):983 - 986 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (519 KB)

    This paper presents a study for the effect of the presence of distribution generation DG on the distribution network. The system losses are calculated for different system configurations (with and without DG's). In addition, the study concerned with transient performance. So, the study system integrated by DG units is exposed to the most common disturbances i.e. load switching and the severest one... View full abstract»

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  • Temporary islanded operation of dispersed generation on distribution networks

    Publication Year: 2004, Page(s):987 - 991 vol. 2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (758 KB)

    The use of decentralized electrical energy resources may be a useful support to the main power supply. In particular, in the event of an upstream supply outage, the temporary islanding operation of dispersed generators in distribution networks might greatly improve the quality and continuity of the power supply. The aim of this work is to verify the feasibility of temporary grid-disconnected opera... View full abstract»

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  • Line switching reconfiguration corrective action for overloads in power systems

    Publication Year: 2004, Page(s):992 - 998 vol. 2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1032 KB)

    This paper proposes an on line technique to select the most effective lines to be switched out of service to reduce overloads in other lines in power systems. A partial rescheduling of spinning reserve generation is then carried out to a further reducing of line overloads using a proposed formula. A contingency analysis of switchable lines is introduced based on the sensitivity parameters of the N... View full abstract»

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  • Using performance indices and analytic hierarchy process to select best dispatch option of energy markets

    Publication Year: 2004, Page(s):999 - 1003 vol. 2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (794 KB)

    This paper presents some dispatch options and performance indices to compare these options. For each dispatch alternative, we propose to use measures for transmission congestion, energy prices, total system utilization, total system losses, and steady-state voltage stability margin. These measures are used to indicate level of system usage, congestion severity, and system security under different ... View full abstract»

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  • A new method for detecting the point of voltage collapse

    Publication Year: 2004, Page(s):1004 - 1008 vol. 2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (709 KB)

    This paper presents a new method for the detection of the point of collapse and a new index for the definition of the distance of the voltage collapse point. Performance index to detect and predict stability problems such as the voltage collapse have been a permanent concern for researchers and technical staff in power systems operation. This index can be used on-line or off-line to help operators... View full abstract»

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  • A decentralized approach for optimal electricity trade schedule using multi-agent systems

    Publication Year: 2004, Page(s):1009 - 1013 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (705 KB)

    Power industry has been undergoing deregulations to introduce competitions among market participants. With the fast development of interconnected power systems, the optimal wholesale electricity trade schedule is an important issue in interconnected power systems under transmission open access. In this paper a decentralized approach is proposed to solve the problem using multi-agent systems (MAS).... View full abstract»

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  • Generation adequacy assessment incorporating wind energy capacity

    Publication Year: 2004, Page(s):1014 - 1018 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (879 KB)

    The assessment of generation adequacy in power networks which include high levels of intermittent generation capacity presents particular problems to power system planners and operators. In particular, networks with high levels of wind energy penetration require careful consideration. This paper deals with the generation adequacy assessment of the electrical network in the Republic of Ireland. In ... View full abstract»

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  • Reliability level evaluation on the customer side for bilateral contract market

    Publication Year: 2004, Page(s):1019 - 1023 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (667 KB)

    This paper presents a reliability level evaluation scheme for customers to assess their outage risk. A bilateral contract model is proposed to express power suppliers as generators with forced outage rates. Outage related cost consisting of potential outage risks and estimated outage cost with weighting coefficients is also proposed as an index of the reliability on the customer side. By using thi... View full abstract»

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  • Fundamental research challenges for active management of distribution networks with high levels of renewable generation

    Publication Year: 2004, Page(s):1024 - 1028 vol. 2
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (871 KB)

    This paper is concerned with critically evaluating existing and emerging active management concepts and defining the contributions that ongoing and future research activities can bring in supporting the implementation of active management in distribution networks. These aims are achieved by defining and then extrapolating from current understanding of active network management. The key contributio... View full abstract»

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  • A study on the reclosing in power system using energy function

    Publication Year: 2004, Page(s):1029 - 1033 vol. 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (623 KB)

    This paper proposes the high-speed reclosing operating method to improve for the stability in the power system. The proposed method calculates the reclosing time, taking the case of standard in which the reclosing is not done using the energy function of generator phase angle. And the execution of reclosing time is calculated, considering the acceleration/deceleration energy of the generator in du... View full abstract»

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