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  • 1.
    Alsyouf, Imad
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design. Mechanical Engineering.
    El-Thalji, Idriss
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    MAINTENANCE PRACTICES IN WIND POWER SYSTEMS: A REVIEW AND ANALYSIS2008Ingår i: European Wind Energy Conference & Exhibition, Brussels Expo, Belgium, 31 March - 3 April 2008, Brussels Expo, Belgium, 31 March - 3 April 2008 , 2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper reviews, analyses, discusses and summarises the recent practices in the area of maintenance of wind power systems. It is based on a comprehensive literature review of relevant published studies. Systematically, a classification of relevant publications was performed based on preliminary review. The literature was divided into content themes based on relevant life cycle processes of wind power systems. Knowing that large percentage of total life cycle cost of wind power systems is attributed to operation and maintenance activities, which is more significant with offshore farms. A considerable portion of this cost stems from the consequences of the inherent reliability and maintainability decisions made during the early phases of planning and conceptual design of the system. Maintenance as a support function has a role in gaining and maintaining competitive advantages. Therefore, it is very important for all relevant stakeholders to be a ware of the role of maintenance in achieving sustainable and competitive energy supply. More cooperation between owners, operators of wind farms and original equipment manufacturers (OEMs) is needed to design better based on maintenance experience. it was found that most of the goals and challenges identified in wind power systems maintenance practices are already achieved in other industrial context, e.g. manufacturing industries. There is a need to do more research projects to investigate how to apply these practices in an efficient and effective way with wind power systems. Right maintenance practices in wind power systems are necessary to build and provide secure, sustainable and competitive energy supply for the future.

  • 2.
    El-Thalji, Idriss
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för teknik, TEK.
    Analyzing Wind Power Asset ManagementSystem: System-Level Methods of Inquiry2010Konferensbidrag (Övrigt vetenskapligt)
  • 3.
    El-Thalji, Idriss
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för teknik, TEK.
    Systems Dependability Engineering for Wind Power Applications: Challenges, Concepts, and System-Level Methodologies2010Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    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.

    Ladda ner fulltext (pdf)
    Licentiate Thesis (Full Text)
  • 4.
    El-Thalji, Idriss
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    Systems Engineering based Tero-technology: A methodologyand applications within wind power system2009Konferensbidrag (Övrigt vetenskapligt)
  • 5.
    El-Thalji, Idriss
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    Systems engineering towards developing an integratedoperation and maintenance concept for wind power systems: Swedish observationsand experiences.2009Konferensbidrag (Övrigt vetenskapligt)
  • 6.
    El-Thalji, Idriss
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för teknik, TEK.
    Terotechnological-Engineered WindTurbine’s Drive-train: Systems Engineering Analysis2010Konferensbidrag (Övrigt vetenskapligt)
  • 7.
    El-Thalji, Idriss
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    Alsyouf, Imad
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    Ronsten, Göran
    WindREN AB Sweden.
    A model for assessing operation and maintenance cost adapted to wind farms in cold climate environment: based on Onshore and offshore case studies2009Ingår i: European Offshore Wind 2009 Conference proceedings, 2009Konferensbidrag (Övrigt vetenskapligt)
    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.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 8.
    El-Thalji, Idriss
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för teknik, TEK.
    Liyanage, Jayantha P
    University of Stavanger.
    Integrated asset management practices for Offshore wind power industry: A Critical review and a Road map to the future2010Ingår i: The Proceedings ofThe Twentieth (2010) InternationalOFFSHORE AND POLAR ENGINEERINGCONFERENCE / [ed] Jin S. Chung, 2010, s. 934-941Konferensbidrag (Refereegranskat)
    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.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 9.
    Zubair, Ghaith
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    El-Thalji, Idriss
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    A model for analysis and design of an integrated operations management system using systems engineering approach: A case study2007Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    Bakgrund: I allmänhet har operations verksamhet en del komplicerade system där friktion kan förekomma. De viktigaste systemen som har påverkan på operations verksamhet är produktion och underhålls system. Att behandla friktions förluster har varit svårt eftersom de både samverkar och delvis överlappar varandra. I dem här studien har olika fall av operationssystem behandlats med att först utveckla en modell, analysera och designa den integrerade operationssystemet för att få den billigaste och dem mest kostnads effektiva sätt att klara av.

    Metod: En modell har utvecklats baserat på de senaste metoderna genom att använda system paradigm metoder och systemtekniska angreppssätt.

    Resultat: Genom att använda fem sätt att analysera, sju bestämmelser extraherade, nio lösningar generade, valdes en av lösningarna och med lösningen som grund designades operations verksamhet.

    Slutsats: Resultatet förslog att operations verksamhet skall integrera organisation, process och kontroll ledningar och inte bara data ledningen.

1 - 9 av 9
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