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Reliability Analysis of Offshore Wind Turbine Structure with Integrity Management Viewpoint

Valadkhani, Ehsan | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53925 (09)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Raie, Mohammad
  7. Abstract:
  8. In this study, a framework for reliability analysis of offshore wind turbine structures has been presented. The rapid development of these structures in the world due to the increasing need for electrical energy and limited sources of fossil fuels has increased the importance of research on the behavior and condition of these structures. For Iran, despite its fossil fuels resources due to its international voluntary commitments to reduce greenhouse gases such as Paris agreement, the use of renewable energy such as offshore wind energy is important. Also, the offshore wind turbine structure is affected by different forces and environmental conditions in its life cycle, which are associated with many uncertainties. Therefore, it is necessary to develop methods to consider the effects of these uncertainties on the reliability of the structure. Previous studies in this field have studied the effects of forces and environmental conditions on the structure separately and the effect of damage caused by forces on the structure has not been considered on the strength of structure during life. But in this thesis, the simultaneous effect of wind, wave and current forces and also fatigue, corrosion and marine growth that in real conditions affect the reliability of offshore wind turbine structure is investigated. In this study, a framework for reliability analysis of offshore wind turbine structure using finite element analysis method and generating of multiple scenarios was presented. By this framework, the effect of all random variables that exist in real condition of the structure can be applied on the reliability of the stucture and it can be calculated as a function of time and in any time period. This framework was used in a case study for an offshore wind turbine with a monopile substructure. The results show that throughout the life of the offshore wind turbine structure, storms are the main cause of structural failure and while in the first 25 years of the structure, the probability of failure due to fatigue is almost zero; In the next 25 years, the probability of failure due to fatigue can account for 25% of the total probability of structural failure
  9. Keywords:
  10. Reliability Analysis ; Wind Energy ; Offshore Wind Turbine ; Monopile Substructure ; Structural Integrity Management

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