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Energies 2014, 7(10), 6645-6664; doi:10.3390/en7106645

Methods for Risk-Based Planning of O&M of Wind Turbines

Department of Civil Engineering, Aalborg University, Sofiendalsvej 11, 9200 Aalborg SV, Denmark
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Received: 30 July 2014 / Revised: 24 September 2014 / Accepted: 10 October 2014 / Published: 16 October 2014
(This article belongs to the Special Issue Wind Turbines 2014)
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Abstract

In order to make wind energy more competitive, the big expenses for operation and maintenance must be reduced. Consistent decisions that minimize the expected costs can be made based on risk-based methods. Such methods have been implemented for maintenance planning for oil and gas structures, but for offshore wind turbines, the conditions are different and the methods need to be adjusted accordingly. This paper gives an overview of various approaches to solve the decision problem: methods with decision rules based on observed variables, a method with decision rules based on the probability of failure, a method based on limited memory influence diagrams and a method based on the partially observable Markov decision process. The methods with decision rules based on observed variables are easy to use, but can only take the most recent observation into account, when a decision is made. The other methods can take more information into account, and especially, the method based on the Markov decision process is very flexible and accurate. A case study shows that the Markov decision process and decision rules based on the probability of failure are equally good and give lower costs compared to decision rules based on observed variables. View Full-Text
Keywords: maintenance planning; risk-based; decision tree; Bayesian networks; Markov decision process maintenance planning; risk-based; decision tree; Bayesian networks; Markov decision process
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nielsen, J.S.; Sørensen, J.D. Methods for Risk-Based Planning of O&M of Wind Turbines. Energies 2014, 7, 6645-6664.

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