Conference programme

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Delegates are invited to meet and discuss with the poster presenters during the poster presentation sessions between 10:30-11:30 and 16:00-17:00 on Thursday, 19 November 2015.

Lead Session Chair:
Stephan Barth, ForWind - Center for Wind Energy Research, Germany
Henri Avila TÜV SÜD Industrie Service GmbH, Germany
Henri Avila (1) F Thomas Zirngibl (1)
(1) TÜV SÜD Industrie Service GmbH, Regensburg, Germany

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2015 and are published here unedited

Mr. Avila has been working in the wind industry for more than 10 years. He is currently Project Manager for TDD at TÜV-SÜD wind cert. in Regensburg, Germany. He studied aviation and aerospace engineering at the Technical University in Berlin. Already during his studies, he has joined in GE Wind energy to write there his theses. There he also took various roles around loads and mircositing. He stayed in Vestas too and has been involved in wind farm projects around the world. In OMV and CE Energy, he had a focus on project development and management.


Poster Download poster (6.82 MB)


Theoretical remaining life time for wind turbines


The wind industry is about to reach the end of the 2nd decade. This means to approach a new frontier in the development. More than 20 years ago the decision was made that the design life time of a wind turbine should be only 20 years. Therefore, the industry is facing the end of the first generation of professional manufactured wind turbines. They are now so call “old timers”. But similar to old cars, a life extension is favoured for some of them. The problem is, like the industry has begun, currently very small, but it will grow steadily over the next years. Therefore, TÜV-SÜD has started to look into the problem.


The idea is to develop a method recommending a remaining life time for turbines which have reached the end of their design lifetime. Secondly, it should be possible to recommend measures to increase the life time of the turbine.

Main body of abstract

All turbines reaching the end of their planned life time, the applied design rules are not longer valid. Consequently, it was necessary to find a way to look into the design parameters. TÜV –SÜD has identified the lifetime performance as one main parameter. However, this method is not covering the risk of increased turbulence and its resulting fatigue loads. Hence, a way to calculate the kinetic energy has been established, too. During the operation time external condition have been change by extensions and newly build wind farms close to original wind farm. Those effects have usually never been reviewed for the existing wind farms.
In addition, the extreme winds have been reviewed as well.
It has been turned out that many components and the turbine condition influencing the life time even more. So TÜV – SÜD implied to the calculation a factor taking into account this conditions, too.
Validation and tests will be performed on several wind farms in order to sharpen the method to provide a realistic assumption about remaining life time calculation method.
Indentified critical operation parameters, e.g. turbulence or exhausted components, have adapted in order to increase the turbine life time.


Life time estimations and prolongations have been established via these methods. It is possible to identify operational factors which influencing the turbine life time. In addition, a maintenance strategy has been recommended for achieving an increased turbine life time and an improved reliability.

Learning objectives
Estimation of remaining operation time for wind turbines reaching the end of their design life time.
Influence of wind farm extensions to existing turbines.
Strategies for long term operation and maintenance of wind turbines.