Effect of Turbulence on Power for Bend-Twist Coupled Blades

Alexander R. Stäblein, Morten H. Hansen

Publikation: Bidrag til tidsskriftKonferenceartikelForskningpeer review

Abstrakt

Bend-twist coupling of wind turbine blades reduces the structural loads of the turbine but it also results in a decrease of the annual energy production. The main part of the power loss can be mitigated by pretwisting the blade, but some power loss remains and previous studies indicate that it might be related to the dynamic response of bend-twist coupled blades in turbulent flow. This paper contains estimations of the power curve from nonlinear time simulations, a linear frequency domain based method and a normal distribution weighted average method. It is shown that the frequency domain based estimation is highly dependant on the validity of the linearized model, thus estimations are poor for operational points close to rated wind speed. The weighted average method gives good results if an appropriate standard deviation is known a priori. The nonlinear time simulations show that changes in power due to turbulence are similar for coupled and uncoupled blades. Power gains at low wind speeds are related to the curvature of the steady state power curve. Losses around rated wind speed are caused by the effects of controller switching between partial and full power operation.

OriginalsprogEngelsk
Artikelnummer042018
BogserieJournal of Physics: Conference Series
Vol/bind753
Udgave nummer4
ISSN1742-6588
DOI
StatusUdgivet - 3. okt. 2016
Udgivet eksterntJa
BegivenhedScience of Making Torque from Wind, TORQUE 2016 - Munich, Tyskland
Varighed: 5. okt. 20167. okt. 2016

Konference

KonferenceScience of Making Torque from Wind, TORQUE 2016
LandTyskland
ByMunich
Periode05/10/201607/10/2016

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