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A data mining approach: Analyzing wind speed and insolation period data in Turkey for installations of wind and solar power plants

Colak, Ilhami; Sagiroglu, Seref; Demirtas, Mehmet; Yeşilbudak, Mehmet (2013)

Wind and solar power plant installations have been recently increased rapidly with respect to the depletion of fossil-based fuels all over the world. Due to stochastic nature of meteorological conditions, wind and solar ...
A new approach to very short term wind speed prediction using k-nearest neighbor classification

Sagiroglu, Seref; Colak, Ilhami; Yeşilbudak, Mehmet (2013)

Wind energy is an inexhaustible energy source and wind power production has been growing rapidly in recent years. However, wind power has a non-schedulable nature due to wind speed variations. Hence, wind speed prediction ...
A novel implementation of kNN classifier based on multi-tupled meteorological input data for wind power prediction

Sagiroglu, Seref; Colak, Ilhami; Yeşilbudak, Mehmet (2017)

With the growing share of wind power production in the electric power grids, many critical challenges to the grid operators have been emerged in terms of the power balance, power quality, voltage support, frequency stability, ...
A novel intelligent approach for yaw position forecasting in wind energy systems

Sagiroglu, Seref; Colak, Ilhami; Yeşilbudak, Mehmet (2015)

Yaw control systems orientate the rotor of a wind turbine into the wind direction, optimize the wind power generated by wind turbines and alleviate the mechanical stresses on a wind turbine. Regarding the advantages of yaw ...
A novel intelligent decision support tool for average wind speed clustering

Colak, Ilhami; Kabalci, Ersan; Kahraman, Hamdi Tolga; Yeşilbudak, Mehmet (2011)

The utilization ratio of wind energy, which is one of the renewable energy sources, is increased around 25% since last 15 years. However, the parameters such as performance of wind turbines and climate features are not ...
A survey on the critical issues in smart grid technologies

Colak, Ilhami; Sagiroglu, Seref; Fulli, Gianluca; Covrig, Catalin-Felix; Yeşilbudak, Mehmet (2016)

The hierarchical and the centrally-controlled grid topology of existing electrical power systems has remained unchanged over the 20th century. On the other hand, there is a rapid increase in the cost of fossil fuels coupled ...
A wind speed forecasting approach based on 2-dimensional input space

Sagiroglu, Seref; Colak, Ilhami; Yeşilbudak, Mehmet (2012)

Wind speed forecasting is required for ensuring an efficient utilization of the wind power generated by wind turbines. This paper purposes the short-term wind speed forecasting in a 2-dimesional input space using the ...
An agglomerative hierarchical clustering tool for renewable energy sources

Colak, Ilhami; Kabalci, Ersan; Bulbul, Halil Ibrahim; Yeşilbudak, Mehmet (2011)

The wind power based energy generation technologies are intensively studied in renewable energy generation issues since last century. The main demands directed to a renewable energy source are being reliable, sustainable ...
An intelligent approach for speed stability analysis of a travelling wave ultrasonic motor based on genetic k-NN algorithm

Colak, Ilhami; Sagiroglu, Seref; Kahraman, Hamdi Tolga; Yeşilbudak, Mehmet (2011)

Driving voltage, driving frequency, phase difference and operating temperature are the parameters which affect the speed stability of a travelling wave ultrasonic motor (TWUSM). The weight coefficients of these parameters ...
An intelligent decision support tool for a travelling wave ultrasonic motor based on k-nearest neighbor algorithm

Colak, Ilhami; Sagiroglu, Seref; Kahraman, Hamdi Tolga; Yeşilbudak, Mehmet (2011)

Driving frequency, amplitude and phase difference of two-phase sinusoidal voltages are the input parameters which have influence on speed stability of travelling wave ultrasonic motors (TWUSMs).These parameters are also ...
Asimetrik çok seviyeli eviricilerin incelenmesi

Çolak, İlhami; Kabalcı, Ersan; Keven, Gökhan (Elektrik Mühendisleri Odası, 2012-10-09)

Asimetrik çok seviyeli eviriciler, çok seviyeli evirici (ÇSE) topolojileri içerisinde daha fazla gerilim seviyeleri üretmelerinden dolayı hızla gelişmektedir. Asimetrik çok seviyeli eviriciler, istenilen çıkış seviyelerini ...
Asymmetrical multilevel inverter topologies

Çolak, İlhami; Kabalcı, Ersan; Keven, Gökhan (Academic Press, 2021-02-14)

Renewable energy sources such as solar, wind, tidal, or biomasses are utilized to generate electrical energy without CO2 emission. Most of the generated energy, either AC or DC, is requested to be converted to AC for ...
Comparision of multi-carrier techniques in seven-level asymmetric cascade multilevel inverter

Çolak, İlhami; Kabalcı, Ersan; Keven, Gökhan (IEEE, 2013-05-13)

The multilevel inverters (MLIs) are classified into three topologies such as Diode Clamped, Flying Capacitor and Cascade Multilevel Inverter (CMLI). CMLI topologies include two kind of structure that is named symmetric and ...
Conventional H-bridge and recent multilevel inverter topologies

Çolak, İlhami; Kabalcı, Ersan; Keven, Gökhan (Academic Press, 2021-02-14)

Traditional H-bridge inverters are composed of four switches controlled with any SPWM strategy, such as bipolar, unipolar, or hybrid. Among these methods, the bipolar SPWM reduces the leakage current by providing constant ...
Data mining and wind power prediction: A literature review

Colak, Ilhami; Sagiroglu, Seref; Yeşilbudak, Mehmet (2012)

Wind power generated by wind turbines has a non-schedulable nature due to the stochastic nature of meteorological conditions. Hence, wind power predictions are required for few seconds to one week ahead in turbine control, ...
Decision tree classification of daily total photovoltaic energy generation data considering meteorological conditions

Ayedi, Faten; Colak, Ilhami; Genc, Naci; Yeşilbudak, Mehmet (2019)

With the increasing penetration rate of photovoltaic systems in the power grid, there has been a remarkable interest in photovoltaic power prediction. Since, accurate predictions handle the volatile characteristics of solar ...
Design and simulation of a drive system for speed control of travelling wave ultrasonic moto

Colak, Ilhami; Demirtas, Mehmet; Bayindir, Ramazan; Yeşilbudak, Mehmet (2010)

This paper presents a low cost, user friendly and effective drive system for the speed control of travelling wave ultrasonic motor (TWUSM). Driving frequency and voltage were used as control inputs in the speed control. ...
Design of a parameter determination system for non-isolated converter topologies

Colak, Ilhami; Irmak, Erdal; Kabalci, Ersan; Yeşilbudak, Mehmet (2011)

Nowadays, power electronics systems developed need small size, reliable, high quality and efficient switch mode power supplies. However, switch mode power supplies also require determining the operating parameters accurately ...
Design of an intelligent decision making system for a travelling wave ultrasonic motor

Colak, Ilhami; Bayindir, Ramazan; Kahraman, Hamdi Tolga; Yeşilbudak, Mehmet (2009)

In this study, an intelligent decision making system which determines the compatibility of operating parameters has been designed for the travelling wave ultrasonic motor (TWUSM). The system designed converts input parameters ...
Excitation current forecasting for reactive power compensation in synchronous motors: A data mining approach

Bayindir, Ramazan; Colak, Ilhami; Sagiroglu, Seref; Yeşilbudak, Mehmet (2012)

Excitation current of a synchronous motor has a key role in reactive power compensation. For this purpose, the k-nearest neighbor (k-NN) classifier designed in this paper predicts the excitation current parameter using ...