Aerodynamic and Hydrodynamic Investigations on Upscaling Effects and Optimization of Offshore Wind Turbines

Putra, Muhammad Juanda
Scarcity and emission issues of conventional fossil fuels have caused a fast shift to renewable energy over the last decades. Wind energy, as one of the cheapest and most advanced forms of renewable energy, is expected to lead the energy market. A recent trend is to develop bigger wind turbines since upscaled wind turbines' rotor size increases power production and reduces a significant amount of operational and maintenance costs of wind turbines. However, there are strict limitations to the design of onshore wind turbines due to transportation issues. Together with noise problems, land usage, and terrain roughness' effects on the vertical distribution of wind speed, offshore wind energy has become more popular. This study aims to investigate the aerodynamic and hydrodynamic effects of upscaling floating offshore wind turbines. For this purpose, upscaling process of NREL 5 MW, IEA 10 MW, and IEA 15 MW atop the OC4DeepCwind semi-submersible floating platform up to 20 MW is presented, and their performances are compared. To enhance the performance of the upscaled turbines, an aerodynamic optimization using the Blade Element Momentum theory coupled with a multi-objective Genetic Algorithm (GA) via HARP_Opt is carried out. Also, composite all glass layup of the optimized blade is analyzed with Classic Lamination Theory (CLT) in Co-Blade. The open-source code, OpenFAST, is used to analyze both the aero-elastic effects on the rotor and tower, coupled with the hydrodynamic load on the floating platforms. The results show that upscaling is feasible and beneficial. Upscaling increases the natural period in all degrees of freedom (DoF) and reduces the dynamic responses of the FOWT, which results in less movement under the same wave excitation as the baselines. Upscaling also increases the generated power, and optimization of the upscaled blade conservatively improves the performance of the turbines. Further increasing of blade length more than linear scale is needed and recommended to reduce the conservative effects of the upscaled turbines.


Preliminary Study on Site Selection For Floating Hybrid Wind And Solar Energy Systems In Turkey
Yerlikaya, Nevzat Can; Çakan, Çağatay; Başara, Ilgın; Caceoğlu, Eray; Huvaj Sarıhan, Nejan (2021-09-08)
It is well-known that even though fossil fuels are the main energy resource in Turkey, use of sustainable energy resources such as wind and solar energy has been increasing in the past years and expected to continue on this trend in the next years to come. The suitable land for land-based wind turbines and photovoltaic (PV) systems could also be convenient for various other purposes, such as agriculture. This study aims to investigate the suitable sites for a combined floating wind and solar systems in the ...
Koç, Melodi Neşe; Oğuz, Elif; Department of Civil Engineering (2022-5-06)
Renewable energy is becoming a popular research topic over the last decades. The floating wind turbine system consists of a typical wind turbine with a platform that the tower of the turbine is implemented. One of the popular floating systems is known as Tension Leg Platforms (TLPs). In this study, TLP is chosen due to the limiting nature of the system in terms of heave, roll and pitch motions. Due to the complexity of the system, coupling analysis of TLPs become important. In this thesis, a benchmark study...
Modeling and investigation of fault ride through capability of variable speed wind turbines
Koç, Erkan; Güven, Ali Nezih; Department of Electrical and Electronics Engineering (2010)
Technological improvements on wind energy systems with governmental supports have increased the penetration level of wind power into the grid in recent years. The high level of penetration forces the wind turbines stay connected to the grid during the disturbances in order to enhance system stability. Moreover, power system operators must revise their grid codes in parallel with these developments. This work is devoted to the modeling of variable speed wind turbines and the investigation of fault ride troug...
Bioelectricity Generation From Wastewater Sludge Using Microbial Fuel Cells: A Critical Review
Ömeroğlu, Seçil; Sanin, Faika Dilek (Wiley, 2016-09-01)
Today, the majority of the world's energy is provided by fossil fuels. Natural energy resources soon will be consumed as a result of rising energy needs of the growing population, leading to a global energy crisis. The insecurity in the energy market also affects the global economy negatively and forces the governments to investigate renewable energy alternatives such as bioenergy. Bioenergy technologies can reduce greenhouse gas (GHG) emissions significantly and can serve to satisfy many forms of energy de...
Feasibility Study of a Grid Connected Hybrid PV-Wind Power Plant in Gwanda, Zimbabwe
Samu, Remember; Fahrioglu, Murat; Taylan, Onur (2016-10-14)
The depletion of fossil fuel resources on worldwide basis has necessitated an urgent search for alternative energy sources to meet up the present day demands. Energy demand is growing in developing nations which makes a hybrid power system, consisting of a hybrid Solar Photovoltaic together with wind energy to be considered one of the best alternatives in renewable energy. These sources of energy can partially or fully meet Gwanda's demand with little or no disturbance on the country's stability. The object...
Citation Formats
M. J. Putra, “Aerodynamic and Hydrodynamic Investigations on Upscaling Effects and Optimization of Offshore Wind Turbines,” M.S. - Master of Science, Middle East Technical University, 2022.