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Systems Dependability Engineering for Wind Power Applications: Challenges, Concepts, and System-Level Methodologies
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Mechnical Eng)
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. , 140 p.
Series
Rapporter: Institutionen för teknik, Linnéuniversitetet, 3
Keyword [en]
System Dependability, Systems Engineering, Terotechnology
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering), Terotechnology
Identifiers
URN: urn:nbn:se:lnu:diva-14402Libris ID: 12329175ISBN: 9789186491536 OAI: oai:DiVA.org:lnu-14402DiVA: diva2:443903
Supervisors
Available from: 2011-10-17 Created: 2011-09-27 Last updated: 2017-09-05Bibliographically approved
List of papers
1. Systems Engineering based Tero-technology: A methodologyand applications within wind power system
Open this publication in new window or tab >>Systems Engineering based Tero-technology: A methodologyand applications within wind power system
2009 (English)Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering), Terotechnology
Identifiers
urn:nbn:se:lnu:diva-14985 (URN)
Conference
5th PhD Seminar on Wind Energy in Europe, Durham University, United Kingdom September 30 - October 2, 2009.
Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2014-05-13Bibliographically approved
2. Analyzing Wind Power Asset ManagementSystem: System-Level Methods of Inquiry
Open this publication in new window or tab >>Analyzing Wind Power Asset ManagementSystem: System-Level Methods of Inquiry
2010 (English)Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering), Terotechnology
Identifiers
urn:nbn:se:lnu:diva-14987 (URN)
Conference
5th World congress of engineering asset management, Brisbane, Australia, 25-28 October.
Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2014-02-27Bibliographically approved
3. Systems engineering towards developing an integratedoperation and maintenance concept for wind power systems: Swedish observationsand experiences.
Open this publication in new window or tab >>Systems engineering towards developing an integratedoperation and maintenance concept for wind power systems: Swedish observationsand experiences.
2009 (English)Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering), Terotechnology
Identifiers
urn:nbn:se:lnu:diva-14984 (URN)
Conference
European Wind Energy Conference, EWEC2009, March 16-19, Marseille, France.
Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2014-05-13Bibliographically approved
4. Terotechnological-Engineered WindTurbine’s Drive-train: Systems Engineering Analysis
Open this publication in new window or tab >>Terotechnological-Engineered WindTurbine’s Drive-train: Systems Engineering Analysis
2010 (English)Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering), Terotechnology
Identifiers
urn:nbn:se:lnu:diva-14986 (URN)
Conference
7th bi-annual European Systems Engineering Conference (EuSEC)-2010, May 23-26, 2010, Royal Institute of Technology and the Swedish National Defense College, Stockholm, Sweden.
Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2014-02-27Bibliographically approved
5. A model for assessing operation and maintenance cost adapted to wind farms in cold climate environment: based on Onshore and offshore case studies
Open this publication in new window or tab >>A model for assessing operation and maintenance cost adapted to wind farms in cold climate environment: based on Onshore and offshore case studies
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.

Keyword
Operation and Maintenance Cost; Cold Climate; Wind Farm; Life Cycle Cost; icing effect; Offshore; OEE ; cost of energy, levelised production cost
Identifiers
urn:nbn:se:vxu:diva-6287 (URN)
Available from: 2009-11-30 Created: 2009-11-29 Last updated: 2014-05-05Bibliographically approved
6. Integrated asset management practices for Offshore wind power industry: A Critical review and a Road map to the future
Open this publication in new window or tab >>Integrated asset management practices for Offshore wind power industry: A Critical review and a Road map to the future
2010 (English)In: The Proceedings ofThe Twentieth (2010) InternationalOFFSHORE AND POLAR ENGINEERINGCONFERENCE / [ed] Jin S. Chung, 2010, 934-941 p.Conference paper, Published paper (Refereed)
Abstract [en]

In comparison to Onshore, the Offshore wind farms and their life cycle operations have number of different aspects to consider. Nowadays, different technological solutions are being tested for design, construction, installation, operating and maintaining of offshore wind farms. Still the challenges are quite diverse and mostly seen relating to; design of electrical infrastructure, structural design and material choice for aggressive environmental and seasonal conditions, site assessment and optimal set-up, substructures, installation methods, logistics, technical service access, operations & maintenance, etc. First the paper reviews technical and physical aspects of the mechanical, electrical, and structural subsystems and their critical failure scenarios as a stand point for assessing the current technological solutions and industrial applications. The second part of the paper attempts to map the status quo within offshore wind industries and assess the current status with respect to an optimum performance criteria expected. It critically reviews, in particular, the technical and operational integrity concepts which have some influence from systems design process, cost-optimal maintenance approaches, and supportive decision making applications, intelligent remote diagnostics prognostics techniques and their feasibility, etc. Thus this paper contributes in many different ways bringing a multi-disciplinary perspective, and leading the way towards further research and industrial applications from integrated asset management point of view.

Keyword
asset management; operation and maintenance; wind power; offshore; cold climate.
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-6974 (URN)
Conference
International Offshore and Polar Engineering Conference (ISOPE) -2010 Beijing, China, June 20-26, 2010.
Available from: 2010-08-05 Created: 2010-08-04 Last updated: 2011-10-17Bibliographically approved

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