Master Degree / Yüksek Lisans Tezleri

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Now showing 1 - 6 of 6
  • Master Thesis
    Investigation of Coupling Methods for Floating Offshore Wind Turbines and Their Application for an Innovative Floating Platform
    (01. Izmir Institute of Technology, 2024) Değirmenci, Olcay; Özkol, Ünver; Özkol, Ünver; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Fosil yakıtların yerini alacak daha çevreci enerji kaynaklarına olan ilgi arttıkça, çeşitli enerji alanları da devreye girmektedir. Bunlardan biri ve giderek artan potansiyeli ile dikkat çeken deniz üstü yüzer rüzgâr enerjisi, önemli araştırma konularından biri olarak platformun OpenFAST gibi aero-hidro-servo-elastik programlara entegrasyonu veya benzer aero-hidro kuvvetlerinin bir arada verilmesi yöntemlerinin incelenmesini kapsamaktadır. Bu tez kapsamında daha önceden 300 kW ve 5 MW değerleri için tasarlanmış olan yenilikçi yüzer platformun 5 MW'lık NREL referans rüzgâr türbini için ölçüleri ve özellikleri analizlerde kullanıma uygun şekilde düzenlenmiştir. Literatürde yaygın olarak kullanılan spar, semi-submersible platformlara ek olarak yenilikçi platform için akuple yöntemleri incelenmiştir. Türbinlerin ve platformların sistem tepkilerini ve davranışlarını görmek için doğal periyotları ve sönüm oranlarını bulma, serbest salınım testleri, düzenli, düzensiz dalga koşullarında, sabit ve türbülanslı rüzgâr koşulları dahil çeşitli koşullarda analizler yapılmıştır. Bunun sonucunda, akuple yöntemlerinin doğrulanması, platformların birbirleriyle karşılaştırılması, yenilikçi platformun esnek ve rijit yapısındaki farklı davranışlar incelenmiştir. Bu bağlamda, OpenFAST'a girdi olarak hidrodinamik katsayı sağlayan açık kaynaklı Capytaine ve NEMOH gibi programların yanı sıra AQWA gibi ticari programların, WAMIT gibi yaygın olarak kullanılan ticari programın OpenFAST çıktılarıyla benzer sonuçlar verdiği görülmüştür. Ayrıca, F2A akuple yönteminin de bu sonuçlarla oldukça tutarlı olduğu gözlemlenmiştir. Ayrıca, platformlar karşılaştırıldığında, bağlama halatlarındaki kuvvetlerin özgün platformda diğer platformlara göre daha yüksek olmasına rağmen, özellikle sistemin kararlılığı açısından önemli bir kriter olan platformun yunuslama açısının önemli ölçüde daha düşük olması sebebiyle, kule, kanat ve sapma yatağı gibi bileşenler üzerinde diğer platformlara kıyasla daha az yük oluştuğu hesaplanmıştır.
  • Master Thesis
    Modellıng And Sımulatıon Of A Doubly Fed Inductıon Generator-based Wındturbıne Under Symmetrıcal Voltage Fault
    (2023) Gökçen Akkurt, Gülden; Altun, Kerem; Akkurt, Gülden Gökçen; Altun, Kerem; 03.10. Department of Mechanical Engineering; 03.06. Department of Energy Systems Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    When wind turbines, which convert wind energy, one of the renewable energy sources, into electrical energy, are connected to the electrical grid, it is of great importance to maintain grid stability. However, the variable nature of wind can pose certain challenges to system stability in wind turbine grid integration. Regulations in different countries require wind turbines to continue contributing to the grid in the event of a fault. In this thesis, the process of converting wind energy into electrical energy through a specific generator is described, and the behaviour of the turbine is simulated in the event of a symmetrical voltage fault. This thesis aims to develop a simulation model for a variable-speed doubly fed asynchronous generator-based (Dfig) wind turbine with a partially scaled frequency converter control using the field-oriented vector control method and to investigate its grid contribution ability under different conditions. The aim was to ensure torque control on the generator side and grid-side control. After the completion of the control system, the turbine's grid contribution ability was examined under short-term faults, and it has been shown that the system continues to contribute to the grid after the voltage drop. The modelling was performed using the Matlab / Simulink program, and the results were shared. In the last part of the thesis, the effect of a symmetrical fault on the rotor current is analysed by the Monte Carlo method.
  • Master Thesis
    Effects of Electrical Dynamic Response of Doubly Fed Induction Generator Type Wind Turbines on Their Mechanical Systems During Single and Multiple Faults
    (2023) Altın, Müfit; Karadeniz, Ziya Haktan; Karadeniz, Ziya Haktan; Altın, Müfit; 03.06. Department of Energy Systems Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    In the early stages of wind turbine technology, the focus was on the separate development of mechanical and electrical systems and research was carried out only in these areas. Today's modern wind turbine designs, which have reached megawatt sizes, continue to be more cost-effective and dependable for countries to achieve their renewable energy targets. In this direction, wind turbine research and development processes have now started to focus on both mechanical and electrical systems and their subsystem interactions. In this thesis study, it is aimed to investigate the effects of the response of electrical control systems on towers components during grid faults. A doubly fed induction generator is used for power generation and power systems including converters and control systems are modelled in MATLAB/Simulink. Simulations were designed in Simulink to test the grid-connected wind turbine model and the Fault Ride Through condition that causes voltage drops in the grid connection lines; the response of the control system and electromagnetic torque output in the relevant case were sent to the mechanical system analysis tool Horizonal Axis Wind Turbine Simulation Code 2 to observe the effects on the mechanical system. In Horizonal Axis Wind Turbine Simulation Code 2, the interaction of the main bodies against forces and limits is analyzed and the results are reported graphically. The state of the system without fault and data with the faults are analyzed comparatively. It has been observed that the reactions of the electrical power systems during grid failure influence the mechanical systems.
  • Master Thesis
    Atmospheric Effects on Short Term Wind Power Forecasting
    (01. Izmir Institute of Technology, 2021) Kalay, Yüksel; Bingöl, Ferhat; Bingöl, Ferhat; Bingöl, Ferhat; 01. Izmir Institute of Technology; 03.06. Department of Energy Systems Engineering; 03. Faculty of Engineering
    Wind power all over the world are being popularizing unlike decrease in conventional sources due to environmental issues. However, power acquired from wind is not stable during day and night, which means that intermittent due to nature of the source. Forecasting in wind power plant is very challenging compared to forecasting of production of conventional power plant. Although there are many robust and site-specific models in order to forecast wind power accurately, decrease of deviation in wind power forecasting by using statistical, physical and hybrid models is still open to new approaches. In this study, four different forecast models based numerical weather prediction (NWP) models for three different wind farms which have different atmospheric conditions are examined to improve wind farm-based power forecasting. For this purpose, wind power forecasting of the providers was categorized based on atmospheric effects, which are site temperature and turbulence. Results have been compared with real time power production from wind turbine supervisory control and data acquisition (SCADA) system. Afterwards, new method based on selecting best provider for specific condition was developed by considering atmospheric effects on power forecasting. It should be noted that the method is an engineering approach, not a new forecast model. In many cases, newly developed method has succeeded to outperform in comparison to results belonging to forecast providers. Hourly and daily wind power forecasting that have significant role in electricity market has been improved for selected wind farms by the help of an engineering approach used in this study. Same method is also implementable to another wind farm if required inputs exist.
  • Master Thesis
    Optimization of a Hybrid Combination of a Photovoltaic Syste and a Wind Energy Conversion System: Izmir Institute of Technology Campus Area Case
    (Izmir Institute of Technology, 2003) Ekren, Orhan; Özerdem, Barış; Özerdem, Mehmet Barış; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Renewable energy resources have gained the great importance due to the growing concerns of environmental problems. The integrated utilization of renewable energies such assolar and wind are becoming very attractive, especially, in most of the isolated and remote areas in many parts of the world.In the present study, firstly, wind and solar radiation measurements, made on Izmir Institute of Technology (IZTECH) Campus area, have been analyzed in order to determine the, both, solar and wind energy potentials of the location. The monthly average wind speeds range from 5.7 m/s to 7.7 m/s, the monthly average of daily values of solar radiation range from 2.1 kWh/m2 to 5.7 kWh/m2 at the monitoring station throughout the measurement period of 12 months between 01.01.2002 and 31.12.2002.Secondly, a procedure is described which determines the hybrid system parameters such as photovoltaic (PV) array area and rotor swept area of wind turbine while satisfying a specific load distribution. The employed method is a graphical construction to figure out the optimum configuration of the generators that satisfies the energy demand mentioned above.
  • Master Thesis
    Wind Resource Assessment on the Campus Area of Izmir Institute of Tecnology: Use of Multi Point Data Sources
    (Izmir Institute of Technology, 2010) Ünveren, Çağdaş; Özerdem, Barış; Özerdem, Mehmet Barış; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Wind data which belong to the three different points on Izmir Institute of Technology campus area but has different time intervals have been used to evaluate the wind power potential on this area which has a complex terrain. The results showed that, this region has significant wind power potential and it is suitable for building a wind farm that has capacity factor over 42%. Mean wind speeds at station which has higher priority with 70 meters of height have been found 8.17 m/s at 50 m height and 8.63 m/s at 80 m height. The prevailing wind direction has also been found as north direction. WAsP and GH WindFarmer software have been used to evaluate the wind statistics and maximize the energy yield by taking into account of noise and visual constraints. Wind turbines which have 2500 kW nominal power have been microsited at the most efficient locations on the wind energy density map. Eighteen turbines with a total capacity of 45 MW were located on the selected sites. The estimated annual net energy productions of the wind turbines have been calculated as 167 GWh/year.