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2 years 2 months ago #13 by Swedish Wind Power Technology Centre
Comments from SWPTC was created by Swedish Wind Power Technology Centre
Comments below is written in the name of Swedish Wind Power Technology Centre. The Centre is organised in theme groups and we have written the comments in the same way.

Theme group 5 – Maintenance and Reliability
Theme group leader: Michael Patriksson, Mathematics, Chalmers University of Technology

The theme group hade the following comments on the agenda.

6. 0 The Centre disagree with the following in the agenda ”Components of present wind turbines are as reliable as similar components in other applications and further increasing the reliability of components may very well lead to higher levelised cost of energy (LCoE). For designing an optimised system, the focus should therefore not be on significantly improving component reliability since that might imply a higher CAPEX (capital expenditure) and hence less favourable LCoE.”
By optimising the maintenance, the life time of the most critical components can be extended. The profit by doing so can be calculated, and has been done for the engine in the Swedish airplane Jas 39 Gripen. In that study, seven components were found that respectively could lower the maintenance costs by more than 1%.

6.1.2 Here optimisation models can be of good use.

6.2.3. Here you can discuss the possibility to install parallel subsystems – that is, introduce redundancy in the system. This has been studied in existing maintenance models within wind power, especially offshore.

6.2.4 The optimisation group at Chalmers has formulated a number of mathematical optimisation models that is based on stochastic life times of components. This also includes using inventories of used components, in order to balance the life times to decrease the number of stops.

6.3. See 6.2.4.

6.3.2. See 6.2.3.

7.1.2. When it comes to robustness, optimisation models could work well, both when it comes to design and also maintenance. If models include sharp optima, they are either clumsily formulated or should be replace with so called robust models. Models for design of wind farms have already been studied when it comes to wind shadows, but there is more work to be done.

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