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An approach for condition-based maintenance optimization applied to wind turbine blades
2010 (English)In: IEEE Transactions on Sustainable Energy, ISSN 1949-3029, Vol. 1, no 2, 77-83 p.Article in journal (Refereed) Published
Abstract [en]

A sound maintenance planning is of crucial importance for wind power systems. There is a large potential in cost savings by optimizing maintenance decisions to make the projects more cost-efficient. This paper presents an approach to optimize condition-based maintenance strategies for components which degradation can be classified according to the severity of the damage. The approach is applicable to inspection-based maintenance as well as maintenance based on online condition-monitoring systems. This enables us to compare the maintenance strategies within a unified framework. First decisions associated with the different maintenance strategies are optimized, then the expected life cycle maintenance costs of the strategies are compared. The model is applied to blades of wind turbine in order to compare three maintenance strategies: visual inspection, inspection with a condition-monitoring technique (e.g., ultrasonic or thermography), and online condition monitoring (e.g., fiber optic). It is shown that online condition monitoring is the optimal maintenance strategy for high failure rate and low crack time to failure. In other cases, inspection with condition-based maintenance is slightly more beneficial. © 2010 IEEE.

Place, publisher, year, edition, pages
2010. Vol. 1, no 2, 77-83 p.
Keyword [en]
Condition based maintenance, Cost saving, Cost-efficient, Degradation model, Expected life, Failure rate, Maintenance decisions, maintenance optimization, Maintenance planning, Maintenance strategies, Monitoring system, Monitoring techniques, On-line conditions, Online condition monitoring, Optimal maintenance, Time to failure, Unified framework, Visual inspection, Wind power systems, Wind turbine blades
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-25047DOI: 10.1109/TSTE.2010.2049452ISI: 000208787900003ScopusID: 2-s2.0-77955702713OAI: diva2:355271
QC 20101006. Tidigare titel:" An Approach for Maintenance Inspection Optimization Applied to Wind Turbine Blades".Available from: 2010-10-06 Created: 2010-10-06 Last updated: 2010-10-06Bibliographically approved
In thesis
1. On Optimal Maintenance Management for Wind Power Systems
Open this publication in new window or tab >>On Optimal Maintenance Management for Wind Power Systems
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Sound maintenance strategies and planning are of crucial importance for wind power systems, and especially for offshore locations. In the last decades, an increased awareness of the impact of human living on the environment has emerged in the world. The importance of developing renewable energy is today highly recognized and energy policies have been adopted towards this development. Wind energy has been the strongest growing renewable source of energy this last decade. Wind power is now developing offshore where sites are available and benefits from strong and steady wind. However, the initial investments are larger than onshore, and operation and maintenance costs may be substantially higher due to transportation costs for maintenance and accessibility constrained by the weather.

Operational costs can be significantly reduced by optimizing decisions for maintenance strategies and maintenance planning. This is especially important for offshore wind power systems to reduce the high economic risks related to the uncertainties on the accessibility and reliability of wind turbines.

This thesis proposes decision models for cost efficient maintenance planning and maintenance strategies for wind power systems. One model is proposed on the maintenance planning of service maintenance activities. Two models investigate the benefits of condition based maintenance strategies for the drive train and for the blades of wind turbines, respectively. Moreover, a model is proposed to optimize the inspection interval for the blade. Maintenance strategies for small components are also presented with simple models for component redundancy and age replacement.

The models are tested in case studies and sensitivity analyses are performed for parameters of interests. The results show that maintenance costs can be significantly reduced through optimizing the maintenance strategies and the maintenance planning.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. 76 p.
Trita-EE, ISSN 1653-5146 ; 2009:051
Wind Power, Maintenance, Reliability, Optimization
urn:nbn:se:kth:diva-11793 (URN)978-91-7415-482-5 (ISBN)
2009-12-04, Sal D3, KTH, Lindstedtvägen 5, Stockholm, 13:00 (English)
Available from: 2009-12-21 Created: 2009-12-18 Last updated: 2010-11-03Bibliographically approved

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Besnard, FrancoisBertling, Lina
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