Browsing Scopus İndeksli Yayınlar Koleksiyonu by Author "Ceylan, Oğuzhan"
Now showing items 1-20 of 32
-
Active and Reactive Power Load Profiling Using Dimensionality Reduction Techniques and Clustering
Yetkin, E. Fatih; Ceylan, Oğuzhan; Papadopoulos, Theofilos A.; Kazaki, Anastasia G.; Barzegkar-Ntovom, Georgios A. (Institute of Electrical and Electronics Engineers Inc., 2019)This paper proposes a methodology to characterize active and reactive power load profiles. Specifically, the approach makes use of fast Fourier Transform for conversion into frequency domain, principle component analysis ... -
An Adaptive Affinity Matrix Optimization for Locality Preserving Projection via Heuristic Methods for Hyperspectral Image Analysis
Taşkın, Gülşen; Ceylan, Oğuzhan (IEEE-Inst Electrıcal Electronıcs Engıneers Inc, 2019)Locality preserving projection (LPP) has been often used as a dimensionality reduction tool for hyperspectral image analysis especially in the context of classification since it provides a projection matrix for embedding ... -
Assessment of Harmonic Distortion on Distribution Feeders with Electric Vehicles and Residential PVs
Ceylan, Oğuzhan; Paudyal, Sumit; Dahal, Sudarshan; Karki, Nava R. (IEEE, 2017)Power-electronic interfacing based devices such as photovoltaic (PV) panels and electric vehicles (EVs) cause voltage/current harmonic distortions on the power grid. The harmonic current profiles from EVs and PVs depend ... -
Branch outage simulation based contingency screening by gravitational search algorithm
Ceylan, Oğuzhan; Özdemir, Aydoğan; Dağ, Hasan (Praise Worthy Prize Srl, 2012)Power systems contingency analysis is an important issue for electric power system operators. This paper performs branch outage simulation based contingency screening using a bounded network approach. Local constrained ... -
Branch outage solution using particle swarm optimization
Ceylan, Oğuzhan; Ozdemir, Aydogan; Dağ, Hasan (2008)For post outage MW line flows and voltage magnitude calculations most of the methods use linear methods because of their simplicity. Especially for reactive power flow calculations one can face high errors. In this paper ... -
Comparative Study of Active Power Curtailment Methods of PVs for Preventing Overvoltage on Distribution Feeders
Paudyal, Sumit; Bhattarai, Bishnu P.; Tonkoski, Reinaldo; Dahal, Sudarshan; Ceylan, Oğuzhan (IEEE, 2018)Overvoltage is one of the major issues on distribution grids with high penetration of photovoltaic (PV) generation. Overvoltage could be prevented through the control of active/reactive power of PVs. However given the high ... -
A Comparative Study of Metaheuristic Algorithms for Wave Energy Converter Power Take-Off Optimisation: A Case Study for Eastern Australia
Amini, Erfan; Golbaz, Danial; Asadi, Rojin; Nasiri, Mandieh; Ceylan, Oğuzhan; Nezhad, Meysam Majidi; Neshat, Mehdi (MDPI, 2021)One of the most encouraging sorts of renewable energy is ocean wave energy. In spite of a large number of investigations in this field during the last decade, wave energy technologies are recognised as neither mature nor ... -
A comparative study of surrogate based learning methods in solving power flow problem
Ceylan, Oğuzhan; Taşkın, Gülsen; Paudyal, Sumit (IEEE, 2020)Due to increasing volume of measurements in smart grids, surrogate based learning approaches for modeling the power grids are becoming popular. This paper uses regression based models to find the unknown state variables ... -
Comparison of post outage bus voltage magnitudes estimated by harmony search and differential evolution methods
Ceylan, Oğuzhan; Özdemir, Aydoğan; Dağ, Hasan (2009)Contingency studies are indispensable tools of both the power system planning and operational studies. Real time implementation of operational problems makes necessary the use of high speed computational methods while ... -
Coordinated Electric Vehicle Charging With Reactive Power Support to Distribution Grids
Wang, Jingyuan; Bharati, Guna R.; Paudyal, Sumit; Ceylan, Oğuzhan; Bhattarai, Bishnu P.; Myers, Kurt S. (IEEE, 2019)We develop hierarchical coordination frameworks to optimally manage active and reactive power dispatch of number of spatially distributed electric vehicles (EVs) incorporating distribution grid level constraints. The ... -
Double branch outage modeling and its solution using differential evolution method
Ceylan, Oğuzhan; Ozdemir, Aydogan; Dağ, Hasan (2011)Power system operators need to check the system security by contingency analysis which requires power flow solutions repeatedly. AC power flow is computationally slow even for a moderately sized system. Thus fast and ... -
Double branch outage modeling and simulation: Bounded network approach
Ceylan, Oğuzhan; Özdemir, Aydoğan; Dağ, Hasan (Elsevier Science, 2015)Energy management system operators perform regular outage simulations in order to ensure secure operation of power systems. AC power flow based outage simulations are not preferred because of insufficient computational ... -
Generic dynamic load modelling using cluster analysis
Barzegkar-Ntovom, Georgios A.; Ceylan, Oğuzhan; Papadopoulos, Theofilos A.; Yetkin, E. Fatih (IEEE, 2018)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 ... -
Gravitational search algorithm for post-outage bus voltage magnitude calculations
Ceylan, Oğuzhan; Ozdemir, Aydogan; Dağ, Hasan (2010)Branch outage problem is one of the key problems in power system security analysis. This paper solves branch outage problem using a bounded approach. Local constrained optimization problem in the bounded approach is solved ... -
Grey Wolf optimizer for allocation and sizing of distributed renewable generation
Ahmadi, Bahman; Ceylan, Oğuzhan; Özdemir, Aydoğan (Institute of Electrical and Electronics Engineers Inc., 2019)Increasing penetration of distributed energy resources (DERs) have brought operational and control philosophy changes in Smart Grids (SGs). Renewable energy based technologies are becoming more important due to their ... -
Harmony Search Algorithm Based Management of Distributed Energy Resources and Storage Systems in Microgrids
Ceylan, Oğuzhan; Sezgin, Mustafa Erdem; Goel, Murat; Verga, Maurizio; Lazzari, Riccardo; Kwaye, Marcel Pendieu; Sandroni, Carlo (MDPI, 2020)Microgrids are composed of distributed energy resources (DERs), storage devices, electric vehicles, flexible loads and so on. They may either operate connected to the main electricity grid (on-grid operation) or separated ... -
Harmony search method based parallel contingency analysis
Ceylan, Oğuzhan; Dağ, Hasan; Ozdemir, Aydogan (2010)Power system security management is one of the key problems in power system analysis. Power system management center operators need to simulate contingencies as fast as possible and take the remedial actions in time. These ... -
Heuristic Methods for Postoutage Voltage Magnitude Calculations
Ceylan, Oğuzhan; Özdemir, Aydogan; Dağ, Hasan (TUBITAK Scientific & Technical Research Council Turkey, 2016)Power systems play a significant role in every aspect of our daily lives. Hence their continuation without any interruption (or with the least duration of interruption due to faults or scheduled maintenances) is one of the ... -
Impacts of Load and Generation Volatilities on the Voltage Profiles Improved by Distributed Energy Resources
Ahmedi, Bahman; Ceylan, Oğuzhan; Özdemir, Aydoğan (Institute of Electrical and Electronics Engineers Inc., 2020)Weather-dependent distributed renewable energy sources such as photovoltaics (PVs) and wind turbines (WT) are increasingly being connected to distribution networks (DNs). Increased penetration of these intermittent sources ... -
Multi-Agent model of electricity networks - a perspective on distribution network charges
Pisica, Ioana; Ceylan, Oğuzhan (Institute of Electrical and Electronics Engineers Inc., 2019)In the UK, DNOs are regulated by Ofgem to use two common distribution use of system charging methodologies: Common Distribution Charging Methodology and Extra-High Voltage Distribution Charging Methodology. To account for ...