Fatigue loads on wind turbines of different control strategies operating in complex terrain

Riziotis, VA; Voutsinas, SG

dc.contributor.author	Riziotis, VA	en
dc.contributor.author	Voutsinas, SG	en
dc.date.accessioned	2014-03-01T01:15:37Z
dc.date.available	2014-03-01T01:15:37Z
dc.date.issued	2000	en
dc.identifier.issn	0167-6105	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13626
dc.subject	wind turbines	en
dc.subject	complex terrain	en
dc.subject	fatigue loads	en
dc.subject	turbulent inflow	en
dc.subject	control concepts	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Mechanics	en
dc.title	Fatigue loads on wind turbines of different control strategies operating in complex terrain	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0167-6105(99)00127-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0167-6105(99)00127-0	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The impact of complex terrain wind conditions on the loading of wind turbines is examined using state-of-art computational means. The analysis is two folded. The first part considers variations of all the wind defining parameters: the turbulence intensities of the wind inflow, the corresponding length scales, the coherence decay factors, the vertical and lateral mean shears, the yaw misalignment and the mean velocity at the hub height. Running several wind turbines it is found that the main driving fatigue mechanism is, as expected, the turbulence intensity. Small length scales and strong three-dimensionality of the inflow, which are characteristic of complex terrains, are secondary factors of increase of the fatigue loads but still in some cases significant. The significance of yaw misalignment is confirmed. In the second part of the work different design concepts are compared in terms of fatigue loads. Four designs at the class of 0.5 MW machines are considered: a classical stall and a classical pitch regulated machine, a "structurally soft" stall machine and a fixed pitch variable speed machine. As regards the significance of the control strategy, it is found that there are no merits for any of them. The "soft" design however seems to have reduced loads. (C) 2000 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS	en
dc.identifier.doi	10.1016/S0167-6105(99)00127-0	en
dc.identifier.isi	ISI:000086700800002	en
dc.identifier.volume	85	en
dc.identifier.issue	3	en
dc.identifier.spage	211	en
dc.identifier.epage	240	en