Differences in damping of edgewise whirl modes operating an upwind turbine in a downwind configuration

Wanke, Gesine; Bergami, Leonardo; Verelst, David Robert

doi:10.5194/wes-2019-88

Cited by 2 publications

(2 citation statements)

References 7 publications

(12 reference statements)

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“…In a following study on a 2.1MW turbine Wanke et al (2019b) showed that large downwind cone angles could reduce the edgewise damping further, as the out-of-plane contribution of the edgewise mode shapes is decreased. A significantly reduced tower torsional stiffness, on the other hand, e.g.…”

mentioning

confidence: 95%

Re-design of an upwind rotor for a downwind configuration: design changes and cost evaluation

Wanke¹,

Bergami²,

Zahle³

et al. 2020

Preprint

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Abstract. Within this work, an existing model of a Suzlon S111 2.1 MW turbine is used to estimate potential cost savings when the conventional upwind rotor concept is changed into a downwind rotor concept. A design framework is used to get realistic design updates for the upwind conﬁguration as well as two design updates for the downwind conﬁguration, including a pure material cost-out on the rotor blades and a new planform design. A full design load basis according to the standard has been used to evaluate the impact of the redesigns on the loads. A detailed cost model with load scaling is used to estimate the impact of the design changes on the turbine costs and the cost of energy. It is shown that generally lower blade mass can be achieved with the downwind conﬁgurations of up to 5 % less than the upwind redesign. Compared to an upwind baseline, the upwind redesign shows an estimated cost of energy reduction of 2.3 % where the downwind designs achieve a maximum reduction of 1.3 %.

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mentioning

confidence: 95%

Re-design of an upwind rotor for a downwind configuration: design changes and cost evaluation

Wanke¹,

Bergami²,

Zahle³

et al. 2020

Preprint

Self Cite

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“…Rotor thrust and tower base fore‐aft moments followed similar trends with lower ultimate loads but additional fatigue wear. Studies also compared the dynamic stability of equivalent upwind and downwind rotors, 23 showing different responses that would justify different design choices, especially in the tower torsional stiffness.…”

Section: Power Production and Loadsmentioning

confidence: 99%

Challenges, opportunities, and a research roadmap for downwind wind turbines

et al. 2021

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This study investigates the challenges and opportunities presented by downwind wind turbines and offers a roadmap of future research pathways to maximize their potential. Multidisciplinary design, analysis, and optimization comparison studies between upwind and downwind configurations on a modern 10‐MW offshore wind turbine are presented to support the discussion. On one hand, the downwind rotor is found to consistently have a smaller swept area under loading. As a result, the downwind design produces less annual energy production (−1.2%). On the other hand, lighter blades for the downwind configuration lead to lower capital costs (−1.7%), so there is little difference in the levelized cost of energy between the two. Key ultimate and fatigue loads are compared, with some values increasing in the downwind configuration, while others decrease. The impact of a downwind configuration on the tower and the impacts of cone and tilt angles and free‐yaw system on the levelized cost of energy are also investigated. The results show a mix of some advantages and disadvantages. Given these results, four areas of research in advanced controls, highly tilted rotors, higher fidelity aerodynamic models, and floating wind are proposed for downwind wind turbines.

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Differences in damping of edgewise whirl modes operating an upwind turbine in a downwind configuration

Cited by 2 publications

References 7 publications

Re-design of an upwind rotor for a downwind configuration: design changes and cost evaluation

Re-design of an upwind rotor for a downwind configuration: design changes and cost evaluation

Challenges, opportunities, and a research roadmap for downwind wind turbines

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