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Sensitivity of Risk-Based Maintenance Planning of Offshore Wind Turbine Farms

Author

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  • Simon Ambühl

    (Department of Civil Engineering, Aalborg University, 9220 Aalborg, Denmark)

  • John Dalsgaard Sørensen

    (Department of Civil Engineering, Aalborg University, 9220 Aalborg, Denmark)

Abstract

Inspection and maintenance expenses cover a considerable part of the cost of energy from offshore wind turbines. Risk-based maintenance planning approaches are a powerful tool to optimize maintenance and inspection actions and decrease the total maintenance expenses. Risk-based planning is based on many input parameters, which are in reality often not completely known. This paper will assess the cost impact of this incomplete knowledge based on a case study following risk-based maintenance planning. The sensitivity study focuses on weather forecast uncertainties, incomplete knowledge about the needed repair time on the site as well as uncertainties about the operational range of the boat and helicopter used to access the broken wind turbine. The cost saving potential is estimated by running Crude Monte Carlo simulations. Furthermore, corrective and preventive (scheduled and condition-based) maintenance strategies are implemented. The considered case study focuses on a wind farm consisting of ten 6 MW turbines placed 30 km off the Danish North Sea coast. The results show that the weather forecast is the uncertainty source dominating the maintenance expenses increase when considering risk-based decision-making uncertainties. The overall maintenance expenses increased by 70% to 140% when considering uncertainties directly related with risk-based maintenance planning.

Suggested Citation

  • Simon Ambühl & John Dalsgaard Sørensen, 2017. "Sensitivity of Risk-Based Maintenance Planning of Offshore Wind Turbine Farms," Energies, MDPI, vol. 10(4), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:4:p:505-:d:95325
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    References listed on IDEAS

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    1. Martin, Rebecca & Lazakis, Iraklis & Barbouchi, Sami & Johanning, Lars, 2016. "Sensitivity analysis of offshore wind farm operation and maintenance cost and availability," Renewable Energy, Elsevier, vol. 85(C), pages 1226-1236.
    2. Green, Richard & Vasilakos, Nicholas, 2011. "The economics of offshore wind," Energy Policy, Elsevier, vol. 39(2), pages 496-502, February.
    3. Jannie Sønderkær Nielsen & John Dalsgaard Sørensen, 2014. "Methods for Risk-Based Planning of O&M of Wind Turbines," Energies, MDPI, vol. 7(10), pages 1-20, October.
    4. Nielsen, Jannie Jessen & Sørensen, John Dalsgaard, 2011. "On risk-based operation and maintenance of offshore wind turbine components," Reliability Engineering and System Safety, Elsevier, vol. 96(1), pages 218-229.
    5. Simon Ambühl & Laurent Marquis & Jens Peter Kofoed & John Dalsgaard Sørensen, 2015. "Operation and maintenance strategies for wave energy converters," Journal of Risk and Reliability, , vol. 229(5), pages 417-441, October.
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