Yazar "Hocaoglu, M. Hakan" seçeneğine göre listele

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    A Comprehensive Review and Adequacy Evaluation of Voltage Stability Indices for Modern Distribution Systems
    (PRAISE WORTHY PRIZE SRL, 2010) Eminoglu, Ulas; Hocaoglu, M. Hakan; Ayasun, Saffet
    It is well known that the network variables and parameters contain sufficient information to obtain the most sensitive bus or line to the voltage collapse in power systems. Accordingly, there has been several static voltage stability indices developed for identifying the buses or lines on the verge of voltage collapse in the literature. In this paper, various voltage stability indices including those originally developed for transmission systems are first reviewed. Then, their adequacies are quantitatively evaluated on a modern distribution test system which has voltage controlled bus (PV-bus). From analyses, it is observed that most of the existing voltage stability indices would be inadequate for assessing the most sensitive bus or line on the verge of voltage collapse in such modern distribution systems. Copyright (c) 2010 Praise Worthy Prize S.r.l. - All rights reserved.
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    A comprehensive review and adequacy evaluation of voltage stability indices for modern distribution systems
    (Praise Worthy Prize S.r.l, 2010) Eminoglu, Ulas; Hocaoglu, M. Hakan; Ayasun, Saffet
    It is well known that the network variables and parameters contain sufficient information to obtain the most sensitive bus or line to the voltage collapse in power systems. Accordingly, there has been several static voltage stability indices developed for identifying the buses or lines on the verge of voltage collapse in the literature. In this paper, various voltage stability indices including those originally developed for transmission systems are first reviewed. Then, their adequacies are quantitatively evaluated on a modern distribution test system which has voltage controlled bus (PV-bus). From analyses, it is observed that most of the existing voltage stability indices would be inadequate for assessing the most sensitive bus or line on the verge of voltage collapse in such modern distribution systems. © 2010 Praise Worthy Prize S.r.l. - All rights reserved.
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    Incorporation of a New Wind Turbine Generating System Model into Distribution Systems Load Flow Analysis
    (WILEY-BLACKWELL, 2009) Eminoglu, Ulas; Dursun, Bahtiyar; Hocaoglu, M. Hakan
    This paper describes a new model for wind turbine generating systems (WTGSs) that is widely used as distributed generation sources. The model is developed by using the bi-quadratic equation, which is generally used for the calculation of the line voltages in distribution systems' load flow analysis, and facilitates computation of real and reactive power outputs of the WTGSs for a specified wind speed and terminal voltage. The developed model is validated with an experimental setup composed by an induction generator coupled with an induction motor as a prime mover. In addition to that measured values, are also compared with the calculated values, obtained by using the turbine models found in the literature. The incorporation of the developed model into some well-known distribution systems' load flow algorithms is detailed. The effect of WTGSs on the power losses, voltage profile of radial distribution systems are evaluated for the sample test systems. Additionally, the performance of the load flow algorithms with the new model are examined and found to be robust and reliable. Copyright (C) 2008 John Wiley & Sons, Ltd.
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    Three-phase transformer and voltage regulator modelling for forward/backward sweep-based distribution system power flow algorithms
    (SAGE PUBLICATIONS LTD, 2009) Eminoglu, Ulas; Hocaoglu, M. Hakan
    This paper describes a new approach for modelling of a distribution transformer and automatic voltage regulator in forward/backward sweep-based algorithms for unbalanced radial distribution systems. For the transformer modelling a symmetrical components model is used and zero sequence voltage and current updating for the sweep-based methods are demonstrated. The validity and effectiveness of the proposed method is demonstrated in a simple two-bus system for grounded wye-delta and delta-grounded wye transformer connections. The automatic voltage regulators (AVRs) are included into the sweep-based methods and tested by using two distribution test systems. From the systems, all results are in agreement, the proposed model is valid and reliable, and the performance of the algorithms is less affected from the inclusion of regulator modelling.
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    Transmission line shunt and series compensation with voltage sensitive loads
    (MANCHESTER UNIV PRESS, 2009) Eminoglu, Ulas; Hocaoglu, M. Hakan; Yalcinoz, Tankut
    This paper presents an analysis of the effects of shunt and series line compensation levels on the transmission line voltage profile, transferred power and transmission losses for different static load models. For this purpose, a simple model is developed to calculate the series and/or shunt compensated transmission line load voltage. Consequently, different shunt and series compensation levels are used with several voltage sensitive load models for two different line models. It is observed that the compensation level is significantly affected by the voltage sensitivities of loads. Moreover, the voltage level of the transmission is an important issue for the selection of the shunt and series capacitor sizes when load voltage dependency is used.