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Electrotechnical Conference, 2000. MELECON 2000. 10th Mediterranean

Date 29-31 May 2000

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  • Variable speed motor drive testing and parameter identification using pseudorandom binary sequences

    Publication Year: 2000, Page(s):1085 - 1088 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Normal and inverse repeat pseudorandom binary sequences (PRBS) are very effective as persistent excitation stimuli in dynamic testing and parameter extraction in motor drive systems. In general a simple linear time invariant (LTI) second order transfer function model can he deployed in conjunction with PRBS correlation methods for adjustable speed drive (ASD) parameter identification. Very accurat... 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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  • Prediction of network voltage collapse through simulation

    Publication Year: 2000, Page(s):1080 - 1083 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    This paper reports on the capability of a typical salient pole generator used for case studies in a simple radial system and in a four bus interconnected network. For both systems attempts are made to highlight indices of voltage collapse under various simulation conditions for locations of interest using EMTDC/PSCAD software. Simulation results suggest that the generator's capability could be det... View full abstract»

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  • Application of sensitivity based coherency analysis to large power system optimisation problems

    Publication Year: 2000, Page(s):1173 - 1176 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Many power system optimisation problems deal with a large number of control variables and operating constraints. For large power systems, the set of constraints may be large, however, the number of operating constraints, which dictate the control resetting actions may be small. From the efficiency point of view, it is important to detect and include in the solution model only a small number of fai... View full abstract»

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  • A computational tool to support spatial electric load forecasting

    Publication Year: 2000, Page(s):1116 - 1119 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    This paper presents the computational tool which has been developed to support decision-making process regarding load forecasting in the context of the electric distribution networks' planning. The tool comprises trending methods as well as a method based on clustering algorithms, in conjunction with a geographic information system (GIS). The paper also presents development progress of the methodo... 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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  • Calculations and analysis of induction motors impact on short-circuit current

    Publication Year: 2000, Page(s):1076 - 1079 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The paper gives a qualitative and quantitative analysis of induction motors impact on the current of a three-pole short-circuit. The transient process in the system is described by Park's model of an induction motor. These results are used for checking the simplified engineering calculation. On the example of the thermal power plant with its self-consumption, a comparative analysis is made of calc... View full abstract»

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  • Wind power integration into electricity networks in Greece

    Publication Year: 2000, Page(s):1157 - 1160 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Following the introduction of the new energy laws 2244/94 and 2773/99 which provide incentives to attract private investments in the renewable energy sources (RES) sector, a large amount of interest for such investments has been experienced in Greece. This paper presents the situation concerning wind energy exploitation, and analyses the technical problems induced by the increased penetration of w... View full abstract»

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  • International comparison of transmission network planning

    Publication Year: 2000, Page(s):1169 - 1171 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    This paper presents a review of the transmission network planning issues currently in use as a consequence of the electric sector deregulation. Included is a review of the transmission planning process followed in many countries with deregulated electric sectors, as well as other issues, perhaps not directly related with network expansion, but with great influence on it, such as the remuneration t... 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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  • Torsional torques of big turbine-generator shafts due to malsynchronization

    Publication Year: 2000, Page(s):1051 - 1054 vol.3
    Cited by:  Papers (1)
    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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  • Performance of single-phase DC drive system controlled by uniform PWM full-bridge DC-DC converter

    Publication Year: 2000, Page(s):974 - 977 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    DC drive systems controlled by pulse-width modulation (PWM) techniques are expected to replace the conventional phase-controlled systems. This is due to their simple control, high reliability, low cost and fast response. This paper presents the performance of a single-phase DC drive system controlled by uniform PWM full-bridge DC-DC converter. Two different uniform PWM control techniques are consi... 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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  • Optimization of the decisions for the renewal/reinforcements on distribution networks

    Publication Year: 2000, Page(s):911 - 914 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    This paper addresses the problem of optimization of the decisions for the renewals/reinforcements on distribution systems, extending the capability of existing computational models into multiobjectives (MO) and uncertainty. The increase of electrical loads and the continuing demand of consumers for a better and uninterrupted supply make it necessary to extend or rebuild parts of or even whole dist... View full abstract»

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  • Active filters for the improvement of electric power quality

    Publication Year: 2000, Page(s):928 - 931 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    In this paper the application of the active EMI filters in order to solve practical utility problems and to improve the electric power quality are presented. Electrical distribution system components are designed to operate at the standard 50 or 60 Hz frequency. However, many loads found in industrial and residential settings demand currents that have frequency components with multiples of the 60 ... View full abstract»

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  • Metal oxide surge arrester design for ultra high voltage transmission lines

    Publication Year: 2000, Page(s):945 - 948 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Each year as line and system loadings increase due to the energy request and more operating companies superimpose higher voltage transmission systems on existing facilities, the ultra high voltage power systems are coming more to the fore. Since the metal oxide surge arresters have an important role in the insulation coordination of the whole power system, in this paper the present development sta... 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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  • Wind energy investments in Greece-an economical approach

    Publication Year: 2000, Page(s):1141 - 1144 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The work presented in this paper concerns the application of a computer model for the economical assessment of investments in the wind energy field, in order that the PUBLIC POWER CORPORATION of Greece can evaluate the potential private investments, during the negotiations for the Power Purchase Agreement. All technical and economic elements of the investment are taken into account, as well as the... View full abstract»

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  • The analysis of optimal energy losses in two-windings transformers

    Publication Year: 2000, Page(s):1072 - 1075 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Objective needs for the determination of electric energy losses for two-windings transformers from transformer posts (TP) and transformer substations (TS) are presented in this work. The paper proposes an original mathematical model to determine the energy losses of TP or TS, valid for the general case of one or several transformers (identical or different from their rated characteristics point of... View full abstract»

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  • Design parameters selection in multimodel adaptive control

    Publication Year: 2000, Page(s):1214 - 1217 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Some design parameters like number of fixed and adaptive models, forgetting factor and minimum time delay between switchings are considered. A parameter adaptation algorithm based on closed loop output error is compared with the classical least squares prediction error algorithm in the multimodel adaptive control. The effects of these parameters on the performance in tracking and in regulation of ... View full abstract»

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  • Artificial neural network based fault locator for EHV transmission system

    Publication Year: 2000, Page(s):1003 - 1006 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    This paper describes the design and implementation of an accurate fault location technique using artificial neural networks (ANN) for the 400 kV Iranian transmission systems. The technique utilises voltage and current fault data at one line end only. These values are stored as waveform samples by a digital fault recorder (DFR) in the substations. The instantaneous three phase voltages and currents... View full abstract»

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  • Protection of AC motors by means of microcontrollers

    Publication Year: 2000, Page(s):1093 - 1096 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    In this study, a system was designed and implemented to make protection for the current, voltage, winding temperature of induction motors. In the system, the voltage transformer with transformation ratio of 400/5 V and current transformer with transformation ratio of 25/5 A were connected to each phase of induction motors. The circuit was designed for measuring the winding temperature. The samplin... View full abstract»

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  • UPFC model for stability calculations with decoupled watt-VAr control system

    Publication Year: 2000, Page(s):1124 - 1127 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The model of a unified power flow controller-UPFC-for stability calculations with the decoupled watt-VAr control system is described in the paper. In the UPFC single line diagram voltage source converters are represented by two phasor equivalent voltage sources which are mutually dependent. For transient stability studies, with the exception of electrical circuits of synchronous machines and contr... View full abstract»

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  • Digital simulation performance of a wind farm

    Publication Year: 2000, Page(s):1153 - 1156 vol.3
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    This paper presents a model for a wind farm made up with double fed induction machines, together with some simulation results of the performance of a wind farm. The digital simulations have been developed taking into account that different wind speeds can cause different rotor angular speeds on each generator and so, different amounts of active power are produced. View full abstract»

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  • Energy consumption analysis of a typical house in Cyprus

    Publication Year: 2000, Page(s):1165 - 1168 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    This study uses TRNSYS to estimate the energy consumption of the typical houses of Cyprus. For the calculations, a Typical Meteorological Year for the Nicosia area and a typical model house are used. The internal house temperature, when no air-conditioning is used, is simulated. The effect on the temperature and the heating and cooling loads that various wall and roof constructions have, is determ... View full abstract»

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