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Cost benefit analysis of mothership concept and investigation of optimum operational practice for offshore wind farms

Dalgic, Yalcin and Lazakis, Iraklis and Dinwoodie, Iain and McMillan, David and Revie, Matthew and Majumder, Jayanta (2015) Cost benefit analysis of mothership concept and investigation of optimum operational practice for offshore wind farms. In: EERA DeepWind'2015: 12th Deep Sea Offshore Wind R&D Conference, 2015-02-04 - 2015-02-06, Norway.

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In far offshore, challenging climate conditions limit the operability and the accessibility of the maintenance vessels significantly.Furthermore, if significant time is spent for the travels between offshore windfarm and O&M port; maintenance tasks cannot be carried out. A mothership can provide the solution for the operators. Due to the fact that the mothership can be moored to a close location to the offshore wind farm, the reaction time to the failures can be minimised; thus the availability of the offshore wind farm can be maximised. In this context, the focus of this research is the cost benefit analysis of the mothership concept and the investigation of the optimum operational practice, which brings financial and operational benefits. This is achieved by performing operational simulations in the offshore wind operational expenditure and logistics optimisation tool StrathOW-OM, which is developed bythe University of Strathclyde and commercial partner organisations. Results show that significant time is spent between offshore windfarm and port, which increases the downtime. October-December is identified as the most critical period for chartering a mothership.