Abstract
AbstractMaintenance is essential in keeping wind energy assets operating efficiently. With the development of advanced condition monitoring, diagnostics and prognostics, condition‐based maintenance has attracted much attention in the offshore wind industry in recent years. This paper models various maintenance activities and their impacts on the degradation and performance of offshore wind turbine components. An integrated maintenance strategy of corrective maintenance, imperfect time‐based preventive maintenance and condition‐based maintenance is proposed and compared with other traditional maintenance strategies. A maintenance simulation programme is developed to simulate the degradation and maintenance of offshore wind turbines and estimate their performance. A case study on a 10‐MW offshore wind turbine (OWT) is presented to analyse the performance of different maintenance strategies. The simulation results reveal that the proposed strategy not only reduces the total maintenance cost but also improves the energy generation by reducing the total downtime and expected energy not supplied. Furthermore, the proposed maintenance strategy is optimised to find the best degradation threshold and balance the trade‐off between the use of condition‐based maintenance and other maintenance activities.
Highlights
Offshore wind energy has witnessed rapid growth in recent years.[1]
We develop a simulation for the degradation and maintenance of offshore wind turbine (OWT) components, and different maintenance strategies can be compared in terms of the total maintenance cost, total downtime and energy not supplied (EENS)
As multiple maintenance activities are performed over the OWT lifetime, the total maintenance cost can be estimated as the sum of Corrective maintenance (CM), time-based preventive maintenance (PM) and condition-based maintenance (CBM) costs
Summary
Offshore wind energy has witnessed rapid growth in recent years.[1]. With continuous investments in the ongoing and future development plans,[2] the total global offshore wind capacity is expected to increase tenfold to 230 GW by 2030 and approaching 1 TW by 2050.3 On the one hand, continuous investments in larger sized offshore wind turbines will reduce the capital expenditure and the cost of offshore wind over time, taking advantage of the economies of scale. Various maintenance activities of CM, imperfect time-based PM, and CBM and their impacts on the degradation and performance of OWT components are presented.
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