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Fatigue load estimation and fatigue load reduction

: Shan, W.; Shan, M.

European Wind Energy Association -EWEA-, Brussels:
European Wind Energy Association Annual Conference and Exhibition 2015 (EWEA 2015) . Vol.3: Poster Papers Continued : Europe's premier wind energy event : Paris, France, 17-20 November 2015
Red Hook, NY: Curran, 2016
ISBN: 978-1-5108-1993-1
European Wind Energy Association (EWEA Annual Conference and Exhibition) <2015, Paris>
Conference Paper
Fraunhofer IWES ()

Fatigue is the structural damage that leads the components of a wind turbine to sudden brittle failure when they suffers cyclic loading [6]. As the size of wind turbines is growing, fatigue loads become more and more significant for the design of major structural components. Concerning fatigue in a wind turbine tower, the fore-aft tower foot bending moment is considered as the most critical load. The benefits of fatigue load reductions, which can be achieved by appropriate design of a wind turbine control system, are increasing [4]. The purpose of this study is 1. to describe the estimation of tower bending fatigue load in the frequency domain [16] for control design. 2. to demonstrate, how a gain scheduled control system based on a "Linear Parameter-Varying" (LPV) model can be designed using this estimation. The control system provides active damping to the first tower eigen frequency (1. TEF) as well as to the 3p harmonic excitation.