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2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)

29-31 May 2000

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  • The use of WASP model and the generation system development in Cyprus

    Publication Year: 2000, Page(s):1036 - 1038 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The Electricity Authority of Cyprus (EAC) has been using for about the past fifteen years the WASP III model (or ELECTRIC module of the ENPEP package) to determine the economically optimum expansion plan of its generation system. The WASP III model is specifically designed to compute the optimum generation expansion policy for an electric utility system within specified constraints given by the pl... View full abstract»

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  • New genetic algorithm for link distribution system design

    Publication Year: 2000, Page(s):887 - 890 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The ability to supply consumers of an urban area without any longer interruption during a feeder segment or substation transformer outage is assured by a link network configuration. The goal of method proposed in this paper is to design such link distribution network that satisfies the growing and changing load demand during the long term planning period with minimal service costs subject to volta... View full abstract»

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  • Analysing a 400 kV power system for an expert system switching

    Publication Year: 2000, Page(s):999 - 1002 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    This paper analyses the switching regime of an important part of the 400 kV Romanian Power System, by means of transient simulations. It defines the best point on wave for the switching operations for a shunt reactor for reactive power/voltage control in a distribution substation. The main purpose of the study is to determine the over-voltages generated in the system when a complex 400 kV subsyste... View full abstract»

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  • Central cogeneration units in Athens-an economical approach

    Publication Year: 2000, Page(s):1032 - 1035 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The work presented in this paper concerns a computer model for the economical assessment of investments in the cogeneration field. All economic elements of the investment are taken into account and, in combination with the necessary technical data, the model calculates the cash flow of the entire investment and of the equity as well as some basic indices for the economic assessment such as the net... View full abstract»

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  • Torsional torques of big turbine-generator shafts due to malsynchronization

    Publication Year: 2000, Page(s):1051 - 1054 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    In this work, a mathematical model for calculating and analyzing the torsional torques of large turbine-generator shafts that occur during various kinds of disturbances in the power network is described. On the basis of the mathematical model, a software package tested on an appropriate example is designed. Special attention is dedicated to torque analysis at malsynchronisation and at high-speed r... View full abstract»

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  • A mathematical approach for identification of fault sections on the radial distribution systems: voltage sensor

    Publication Year: 2000, Page(s):882 - 886 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A mathematical technique for detecting fault section(s) and affected area(s) on radial distribution networks is proposed in this paper. Minimum voltage sensors are installed at various locations at the customer ends. The novel method uses messages obtained from operated voltage sensors and topological information of distribution networks to detect accurately fault section(s) and fault affected are... View full abstract»

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  • Information modeling of power substations by using the unified modeling language

    Publication Year: 2000, Page(s):995 - 998 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Efficient and high-quality design of the substation automation systems has always been a real challenge. The problem of identification and location of information in the system and the description of information processing activities is a significant design problem. Information modeling is aimed at resolving it. An efficient approach to information modeling can significantly improve substation aut... View full abstract»

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  • Design of a waveguide based optoelectronic integrated circuit in silicon 0.8 micron BiCMOS technology

    Publication Year: 2000, Page(s):1206 - 1209 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    An optoelectronic integrated circuit was designed, simulated and realised in a standard 0.8 micron BiCMOS silicon integrated circuit fabrication process. The designed optical circuits considered of an integrated silicon light sources, an optical guiding structure, an integrated optical detector and a high gain amplifier. Simulations predict a bandwidth capability of 115 MHz for detected photo-curr... View full abstract»

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  • An overview of renewable energy sources for the Cyprus energy market

    Publication Year: 2000, Page(s):1149 - 1152 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The harmonisation of the Republic of Cyprus with the European Union as well as the obligations that stem from the Kyoto agreement call for the liberalisation of the energy sector as well as for the introduction of technologies less harmful to the environment. A survey has been carried out of the currently available renewable energy sources, such as wind, solar, biomass, wave and tidal. A prelimina... View full abstract»

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  • Effects of entrained air on the performance of nuclear reactor cooling pumps

    Publication Year: 2000, Page(s):1028 - 1031 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    An important aspect of nuclear energy is safety. One of the most severe accidents in nuclear power generation is the loss of coolant, where the recirculating coolant of the pressurized water reactor may flash into steam. Under such two-phase flow conditions, the reactor cooling pumps become unable to generate the same head as that of the single-phase flow case. In this work, high-speed video (HSV)... View full abstract»

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  • Generator dynamics influence on currents distribution in fault condition

    Publication Year: 2000, Page(s):1047 - 1050 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Current flow calculation results along the elements of a complex power system are analyzed in this work, during a three-phase short-circuit taking into account relative rotor swing. Analysis is implemented on the examples when the infinite bus fault point is supplied by one or more generators. It is shown that generator swing neglected during short-circuits, essentially changing current distributi... View full abstract»

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  • High impedance arcing fault detector for three-wire power distribution networks

    Publication Year: 2000, Page(s):899 - 902 vol.3
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A new approach to a high impedance fault (HIF) detector is presented, suitable for the European scene where the power distribution systems are usually three-phase and three-wire configured. This paper aims to be a contribution to the proposals that, in the last twenty years, have been trying to solve the HIF problem with no definitive solution known yet. The purpose of the study presented is to de... View full abstract»

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  • Load symmetrization in supply systems with distorted line voltage

    Publication Year: 2000, Page(s):966 - 969 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Active power filters can be successfully implemented to reduce fundamental reactive power and harmonic distortion in supply systems. Consecutively, active filters in three-phase systems can eliminate unbalance, caused by mutually noncompensated harmonic currents. Even more, with a proper control algorithm, active filters can improve symmetrical conditions of unbalanced fundamental load currents. T... View full abstract»

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  • Residential customer preferences in the DSM programmes

    Publication Year: 2000, Page(s):1111 - 1114 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    This paper presents outputs from the load and market research containing load analysis, residential energy market structure and customer preferences. On the basis of achieved measurement results, proposal of the residential DSM programme for the local utility is recommended. Knowledge of the residential energy market structure and customer preferences will also be helpful in formulating the strate... View full abstract»

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  • Detailed representation of substations in power system state estimation

    Publication Year: 2000, Page(s):1177 - 1180 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    This paper presents a method for detailed representation of substations in power system state estimation. The conventional weighted least squares state estimator is extended by incorporating the active and reactive power flows of circuit breakers as state variables. Power system observability and state estimates are determined based on a reduced model. The method is illustrated with a 12 bus syste... View full abstract»

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  • Analysis of wind turbine grounding systems

    Publication Year: 2000, Page(s):936 - 939 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    In this paper, the response of wind turbine grounding systems is calculated under fault conditions or when they are hit by lightning. The objective is their effective design in terms of dispersion of imposed currents and minimization of raised potentials. Locally raised potentials are calculated in terms of steady state GPR. Transferred potentials to neighboring wind turbines are also computed. Me... View full abstract»

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  • A geno-fuzzy optimization of power system reliability

    Publication Year: 2000, Page(s):991 - 994 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The concept of reliability apportionment is general and has even been applied to the allocation of man-machine reliability. Typically, however, the process of optimally apportioning individual component reliability to meet some desired system reliability level subject, perhaps, to constraints on cost, volume, weight, etc., has always been imprecise and vague at best. In real problems, the resource... View full abstract»

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  • Connecting haptic interface with a robot

    Publication Year: 2000, Page(s):1202 - 1205 vol.3
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Specific issues of force-reflected telemanipulating systems are addressed in this article. The authors' approach that might be used in robotic assisted surgery is based on combination of the best and complementary characteristics of a human operator and of a robot. Simultaneously the operator uses his own judgement, manually guides the slave robot, while the master robot (haptic interface) provide... View full abstract»

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  • Modelling and simulation of the effects of grid connected wind farms on the Cyprus electricity grid

    Publication Year: 2000, Page(s):1145 - 1148 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Electricity generation in Cyprus is concentrated on the east part of the island. Often power surges to the west where the grid is weak, upset the system. The author simulated a system of grid connected wind farms situated at the west of the island, which could alleviate the east-west power surge problem. The wind farms considered consist of 300 kW, high speed, horizontal axis, induction machine tu... View full abstract»

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  • Comparative analysis of the electric power sector asset and capital structure in developing countries: the Turkish case

    Publication Year: 2000, Page(s):1023 - 1026 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Data has been collated in this paper-going back as far as available resources permit-in order to analyse the structural problems of the electric power sector in developing countries, with special reference to the public and private domains of that sector. In this context, asset and capital structures of the sectors have been determined and presented in comparative form. These are the most importan... View full abstract»

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  • A fuzzy expert system for peak load forecasting. Application to the Greek power system

    Publication Year: 2000, Page(s):1097 - 1100 vol.3
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    This paper presents the development of a fuzzy expert system used to forecast the daily load curve's two minima and two maxima, for each season of the year. The inference operations of fuzzy rules are performed following the Larsen max-product implication method and the product degree of fulfillment method, while the defuzzification procedure is based on the center of area method. The proposed fuz... View full abstract»

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  • Protection of gate movement in hydroelectric power stations

    Publication Year: 2000, Page(s):1043 - 1046 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Movement of the gates is an everyday task performed on a dam of hydroelectric a power station. This operation is often controlled remotely by measuring the positioning of the gates and a level of the current in the driving motors. This method of control cannot, however, detect anomalies, such as asymmetric movement of gates, faults in drive gearwheel etc. We therefore decided to devise a new impro... View full abstract»

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  • Overvoltages provoked by faults in the distribution electrical network

    Publication Year: 2000, Page(s):895 - 898 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The study of the overvoltages generated by faults in the transmission distribution electrical network comprised over 500 live tests of a single phase-to-earth fault in a 10 kV network. The influence of the neutral point grounding resistance on overvoltages in the network is researched. Different values of the resistor were used. Moreover the networks with an insulated neutral point were tested. A ... View full abstract»

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  • Design and evaluation of an EMTDC digital current transformer model

    Publication Year: 2000, Page(s):1007 - 1010 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The paper describes a new digital current transformer model designed for the use with the EMTDC/PSCAD transient power system simulation. The validity of the current transformer model has been assessed by using theoretical analysis, EMTP simulation and test results obtained from the Synthetic Test Plant (STP) at Alstom T&D Protection and Control Ltd. View full abstract»

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  • Electrical insulation study using partial discharge model

    Publication Year: 2000, Page(s):1060 - 1063 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    For partial discharge (PD) processes of electrical insulation internal defaults ignition and their parameters measurement, different electrical models were developed. These models present the combination of electrical insulation and its defaults. All these models use the "a-b-c" diagram. Using these kind of equivalent diagrams, the paper presents the methods of apparent charge (q) and PD energy ev... View full abstract»

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