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A model for assessing operation and maintenance cost adapted to wind farms in cold climate environment: based on Onshore and offshore case studies
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
WindREN AB Sweden.
2009 (English)In: European Offshore Wind 2009 Conference proceedings, 2009Conference paper, Published paper (Other academic)
Abstract [en]

The cumulative costs for O&M may represent as much as 65%-90% of a turbine's investment cost. The higher cost ratios are valid for offshore farms and for onshore farms located in cold, icy or remote areas. The ongoing studies conducted by wind energy in cold climates (IEA- Task 19) concluded that the increased O&M costs and extended downtime under icing conditions have to be taken into account. Therefore, in this study we developed a model for assessing the O&M cost of wind farms operated in cold climate. The model was verified using two methods: season-categorised method for downtime based on data reported by VTT and temperature-categorized method for production losses based on data collected from Aapua wind farm. Using the developed model gives a better understanding of the O&M cost of wind power systems taking into account relevant contextual factors. As well as, it helps the stakeholders to improve their decisions at different phases of the system's life cycle.

Place, publisher, year, edition, pages
2009.
Keywords [en]
Operation and Maintenance Cost; Cold Climate; Wind Farm; Life Cycle Cost; icing effect; Offshore; OEE ; cost of energy, levelised production cost
Identifiers
URN: urn:nbn:se:vxu:diva-6287OAI: oai:DiVA.org:vxu-6287DiVA, id: diva2:278745
Available from: 2009-11-30 Created: 2009-11-29 Last updated: 2014-05-05Bibliographically approved
In thesis
1. Systems Dependability Engineering for Wind Power Applications: Challenges, Concepts, and System-Level Methodologies
Open this publication in new window or tab >>Systems Dependability Engineering for Wind Power Applications: Challenges, Concepts, and System-Level Methodologies
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Complexity and uncertainty have impacted wind power systems and their applications.Commercial wind power asset exhibits complex system behaviour due tostochastic loading characteristics of its installation context. However, differentstakeholders’ practices in whole life cycle processes try to treat multi-disciplinarycomplexity issues. Moreover, wind power system failures, stoppages, faults, supportdelays and human/organizational errors provide a clear proof of increasingthe needs for dependability. Therefore, dependability is considered as an aggregatetheory for RAMS (Reliability, Availability, Maintainability, Safety & Supportability)in order to cope with complex systems (i.e. physical systems and their assetmanagement systems) and their behaviour phenomenon. Consequently, to addresswind power practical problem as one of the modern complex and interdependentsystems, it is worth to enhance both the way of how we look at dependability andthe method of inquiry. Technical system complexity, system interdependency andsystem learn-ability are the main challenges within system dependability field.Therefore, this research work is done to integrate both terotechnology and systemsengineering methodologies to enhance systems dependability theory and practices.In particular, it focuses on three main aspects within systems dependability engineering:challenges, practitioners’ concepts and system-level methodologies.The research methodology of this thesis has utilised the mixed research approachof qualitative and quantitative methods to extract the empirical findings that arerequired to validate the dependability theory developments. Qualitative survey isused to identify the challenges of dependability theory within wind power applications.Grounded theory is used to define the practical understanding of windpower stakeholders concerning to dependability and asset management concepts.Case study is implemented to validate the systems dependability engineering, ascross edge theory of dependability and systems engineering. Moreover, the phenomenographymethod is used to capture the individual experiences and understandingof purposefully selected stakeholders, due to different site-specific circumstancesfor each wind farm.In general, the thesis contributes to the body of knowledge of five fields: dependability,terotechnology, asset management, systems engineering and wind energy.In particular, the focus of thesis contributes with retrospective review to be as referenceline for system dependability theory. Simultaneously, on basis of empiricalfindings, it contributes to be a pivot point for further enhancements from both theacademic contributions and industrial developments.

Place, publisher, year, edition, pages
Växjö: School of Engineering, Linnaeus University, 2010. p. 140
Series
Rapporter: Institutionen för teknik, Linnéuniversitetet ; 3
Keywords
System Dependability, Systems Engineering, Terotechnology
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering), Terotechnology
Identifiers
urn:nbn:se:lnu:diva-14402 (URN)9789186491536 (ISBN)
Supervisors
Available from: 2011-10-17 Created: 2011-09-27 Last updated: 2017-09-05Bibliographically approved

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El-Thalji, Idriss

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