Journal ArticleDOI
Reliability of wind turbine subassemblies
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In this article, the authors investigated the reliability of more than 6000 modern onshore wind turbines and their subassemblies in Denmark and Germany over 11 years and particularly changes in reliability of generators, gearboxes and converters.Abstract:
We have investigated the reliability of more than 6000 modern onshore wind turbines and their subassemblies in Denmark and Germany over 11 years and particularly changes in reliability of generators, gearboxes and converters in a subset of 650 turbines in Schleswig Holstein, Germany. We first start by considering the average failure rate of turbine populations and then the average failure rates of wind turbine subassemblies. This analysis yields some surprising results about which subassemblies are the most unreliable. Then we proceed to consider the failure intensity function variation with time for wind turbines in one of these populations, using the Power Law Process, of three subassemblies; generator, gearbox and converter. This analysis shows that wind turbine gearboxes seem to be achieving reliabilities similar to gearboxes outside the wind industry. However, wind turbine generators and converters are both achieving reliabilities considerably below that of other industries but the reliability of these subassemblies improves with time. The paper also considers different wind turbine concepts. Then we conclude by proposing that offshore wind turbines should be subject to more rigorous reliability improvement measures, such as more thorough subassembly testing, to eliminate early failures. The early focus should be on converters and generators.read more
Citations
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Journal ArticleDOI
Prediction of wind turbine generator bearing failure through analysis of high frequency vibration data and the application of support vector machine algorithms
TL;DR: Results show that by analysing high-frequency vibration data and extracting key features to train support vector machine algorithms, an accuracy of 67% can be achieved in successfully predicting failure 1–2 months before occurrence.
DissertationDOI
Coupled computational fluid dynamics/multibody dynamics method with application to wind turbine simulations
TL;DR: Li et al. as mentioned in this paper used the CFD dynamic overset code CFDShip-Iowa v4.5 to compute the aerodynamics, coupled with the MBD code Virtual.Lab Motion to predict the motion responses to the aerodynamic loads.
Journal ArticleDOI
Application of a synchronous generator with a boost converter in wind turbines: an experimental overview
TL;DR: In this paper, an electrical structure of a variable-speed wind turbine based on an externally excited synchronous generator; a passive diode rectifier; and a boost converter is discussed.
Book ChapterDOI
Principles of electrical design of permanent magnet generators for direct drive renewable energy systems
TL;DR: In this article, the authors discuss the electromagnetic design of direct drive generators for renewable energy generation, and discuss the main material choices and topology choices with their advantages and disadvantages, as well as the scaling laws that make it possible to estimate the size of direct-drive generators.
Journal ArticleDOI
Accessibility assessment for operation and maintenance of offshore wind farms in the North Sea
TL;DR: In this article, a detailed accessibility analysis of the North Sea is presented, focusing on offshore wind energy operation and maintenance applications, and a rigorous mathematical formulation of relevant accessibility parameters is given by means of the set theory.
References
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Journal ArticleDOI
Comparison of direct-drive and geared generator concepts for wind turbines
TL;DR: The DFIG1G seems the most attractive in terms of energy yield divided by cost, but the DDPMG has the highest energy yield, but although it is cheaper than the DDSG, it is more expensive than the generator systems with gearbox.
Journal ArticleDOI
Survey of Failures in Wind Power Systems With Focus on Swedish Wind Power Plants During 1997–2005
J. Ribrant,Lina Bertling +1 more
TL;DR: In this paper, the authors present results from an investigation of failure statistics from four sources, i.e. two separate sources from Sweden, one from Finland, and one from Germany, revealing reliability performance of the different components within the wind turbine.
Journal ArticleDOI
Reliability analysis for wind turbines
Peter Tavner,J. Xiang,F. Spinato +2 more
TL;DR: In this paper, the reliability of wind turbine components from historic German and Danish data has been analyzed using reliability analysis methods which are not only applicable to wind turbines but relate to any repairable system.
Book
Statistical Methods for the Reliability of Repairable Systems
Steven E. Rigdon,Asit P. Basu +1 more
TL;DR: Terminology and Notation for Repairable Systems and Probabilistic Models: The Poisson Process are reviewed.
Journal ArticleDOI
Condition monitoring and fault diagnosis of a wind turbine synchronous generator drive train
TL;DR: In this article, the application of wavelet transforms is investigated in the light of the disadvantages of spectral analysis in processing signals subject to the stochastic effects of the wind, and the technique can be used to monitor generator electrical and drive train mechanical faults.
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Survey of Failures in Wind Power Systems With Focus on Swedish Wind Power Plants During 1997–2005
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