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A Novel Intelligent Decision Support Tool for Average Wind Speed Clustering
I. Colak,E. Kabalci,M. Yesilbudak,H.T. Kahraman 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
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 analyzed adequately. At the analysis stage of these parameters, data mining techniques are required to be used. In this study, the agglomerative hierarchical clustering method which is one of the data mining techniques is used to analyze the provinces located in the Central Anatolia Region of Turkey in terms of average wind speed. Nearest neighbor algorithm is used as the clustering algorithm. Euclidean, Manhattan and Minkowski distance metrics are used determine the optimum hierarchical clustering results in this algorithm. The achieved clustering results based on Euclidean distance metric provide the optimum inferences to expert according to other distance metrics.
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Parallel DC-AC Conversion System Based on Separate Solar Farms with MPPT Control
Ilhami Colak,Ersan Kabalci,Gungor BAL 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Three separate solar farms that provide 15 ㎾ power for each farm are modelled using Matlab Simulink real-time analysis software in this study. Each solar farm models are constituted by connecting 170W photovoltaic (PV) panels and energy conversion is performed with maximum power point tracking (MPPT) algorithms in each converter. The MPPT algorithm utilized in the control step of converters is developed using Perturb and Observe (P&O) structure. The converters used in the solar farms are designed in boost converter topology while output voltages are collected in DC busbar with parallel connection of converters. The converters are connected to busbar over interphase transformers (IPT). The DC busbar voltage is applied to a full bridge inverter to generate 3-phase AC voltages at the output of inverter. The three-phase inverter is controlled with sinusoidal pulse width modulation (SPWM) scheme, which is developed with phase shifted carrier signals. The load of inverter is set to an adjustable load, which is capable to be increased up to 50 ㎾. The measurement points seen in the Simulink design are analysed in detail. Each measurement point’s definition and screen captures are also evaluated in the study.
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