İşletme Fakültesi

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Browsing İşletme Fakültesi by Journal "2018 53rd International Universities Power Engineering Conference (UPEC)"

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    Citation - WoS: 4
    Citation - Scopus: 5
    Generic Dynamic Load Modelling Using Cluster Analysis
    (IEEE, 2018) Barzegkar-Ntovom, Georgios A.; Ceylan, Oğuzhan; Papadopoulos, Theofilos A.; Yetkin, E. Fatih; Business Administration; Management Information Systems; 03. Faculty of Economics, Administrative and Social Sciences; 01. Kadir Has University
    In this paper a new generic load modelling procedure is proposed based on the application of cluster analysis on load model parameters identified from measured dynamic responses. The performance of the proposed approach is assessed using measurements obtained from a low-voltage laboratory scale test configuration. In order to develop robust generalized load models applicable to a wide range of operating conditions different load compositions operating conditions and voltage disturbances are considered in the analysis. The findings of this paper verify the validity of the proposed generic modelling procedure and indicate robust results using the proposed methodology.
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    Citation - Scopus: 1
    Semi-Centralized Control of Distributed Generation in Smart Grids
    (IEEE, 2018) Ceylan, Oğuzhan; Pisica, Ioana; Paudyal, Sumit; Management Information Systems; 03. Faculty of Economics, Administrative and Social Sciences; 01. Kadir Has University
    This paper proposes a semi-centralized intelligent control approach for voltage regulation in distribution grids based on sensitivity calculations. The model checks the voltage magnitudes of each end of each lateral in the system one by one then if any of these violates the allowed voltage magnitudes each node in a single lateral sends its reactive power capability and sensitivity information to the sensor located at the beginning node of that lateral. This information is sorted at the sensor and required voltage is computed and assigned to the bids one by one. This paper tests this approach on a modified 33 Node Distribution Test system with several renewable energy sources: photovoltaics (PVs) and wind turbines (WTs) and presents the numerical results based on a 15 minute resolution load data PV outputs and WT outputs.
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    Citation - Scopus: 3
    Two-Layer Earth Structure Parameter Estimation and Seasonal Analysis
    (IEEE, 2018) Papadopoulos, Theofilos A.; Ceylan, Oğuzhan; Papagiannis, Grigoris K.; Management Information Systems; 03. Faculty of Economics, Administrative and Social Sciences; 01. Kadir Has University
    The determination of soil parameters is an important topic regarding the safe and efficient design of electrical grounding systems as well as the accurate calculation of the per-unit-length parameters of overhead transmission lines and underground cable systems. Scope of this paper is to investigate the seasonal variation of the two-layer earth structure parameters and propose simple generic models for this type of the analysis. For the determination of the two-layer earth parameters the application of different optimization methods is evaluated. Furthermore soil resistivity measurements are conducted at three different sites during a period of a whole year. The obtained results of the two-layer earth structure are analyzed in order to investigate the seasonal variation and their correlation to changes of rainfall. From the analysis of the results significant conclusions are drawn regarding the accuracy of the resulting soil parameters as well as their annual variation.