Condition-based production between turnarounds for offshore wind turbines

Boekema, F.P.A. (2017) Condition-based production between turnarounds for offshore wind turbines. Master's Thesis / Essay, Industrial Engineering and Management.

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Abstract

Offshore wind turbines have high economic dependency due to significant fixed set-up costs for maintenance activities. Therefore, performing maintenance on multiple turbines in a turnaround may be more cost-efficient. When a turnaround is scheduled, it is desired to prevent turbine failure before initiation because corrective maintenance generally requires more sophisticated actions and the replacement of broken down parts. Turbine deterioration might increase with high rotational speeds due to stronger vibrations and higher temperatures. The installation of a condition monitoring system and variable speed gearbox may be able to control the deterioration rate by using moderate production settings. This allows for the postponement of turbine failure. In this paper, we introduce condition-based production between turnarounds for a single wind turbine. A trade-off is posed between maintenance costs and production losses. We model a system with multiple production settings and discuss how different relations between production and deterioration affect the optimal production planning. Results show that if the deterioration rate is a convex function of the production rate, moderate production settings are used and significant total cost savings are obtained. Furthermore, a sensitivity analysis provides extra insights into optimal production planning structures and how it affects total costs.

Item Type:	Thesis (Master's Thesis / Essay)
Degree programme:	Industrial Engineering and Management
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	15 Feb 2018 08:28
Last Modified:	15 Feb 2018 08:28
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/15168

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