Journal ArticleDOI
Reliability of wind turbine subassemblies
TLDR
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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Proceedings ArticleDOI
Effect of reliability of wind power converters in productivity of wind turbine
Sanjay Jaiswal,G. L. Pahuja +1 more
TL;DR: In this paper, the reliability modeling in terms of Reliability block diagram (RBD) of different configurations of power electronic converter has been implemented, which shows that case2 configuration of power converter enhances the reliability by twenty four percent in case of squirrel cage induction generator (SCIG) and twenty five percent in the case of doubly fed induction generator(DFIG) based wind turbines.
Proceedings ArticleDOI
Failures analysis of wind turbines: Case study of a Chinese wind farm
TL;DR: In this paper, the failure and maintenance statistics of a wind farm in Jiangsu Province of China are classified, and the reliability of main components in the wind turbines is also analyzed.
Dissertation
Wind Turbine Generator Reliability: An Exploration of the Root Causes of Generator Bearing Failures
TL;DR: In this article, the authors demonstrate the value of models which may help to explain some of the failure modes of wind turbine generators and their root causes, and demonstrate the importance of holistic analyses of WTs, which are complex electromechanical systems with non-trivial interactions between sub-assemblies.
Journal ArticleDOI
Failure Rate Assessment for Onshore and Floating Offshore Wind Turbines
TL;DR: In this article , a detailed analysis is performed on a dataset of failure and maintenance records from various onshore wind farms located in different geographical areas for the safety, risk, reliability, availability, and maintainability characterization of wind turbines.
Journal ArticleDOI
SCADA based nonparametric models for condition monitoring of a wind turbine
Ravi Kumar Pandit,David Infield +1 more
TL;DR: Two nonparametric methods are proposed for power curve modelling, the Gaussian Process treated as the benchmark model, and a comparative analysis was undertaken using a Regression tree model; the advantages and limitations of each model will be outlined.
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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