Big Adaptive Rotor Phase I (Final Report)

Johnson, Nick; Paquette, Joshua; Bortolotti, Pietro; Mendoza, Nicole; Bolinger, Mark; Camarena, Ernesto; Anderson, Evan M.; Ennis, Brandon Lee

doi:10.2172/1835259

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…In the past few years, a clear trend can be observed in reducing the specific rating (i.e. the ratio of rated power to rotor swept area) for newly installed turbines, especially onshore as reported by Hand et al (2018) and Bolinger et al (2021). Typically, such modern three-bladed onshore turbines operate with a high design tip speed ratio (TSR) of up to 10 and a high power coefficient in the lower partial load range, extending from cut-in wind speed to approximately 7.5 to 9 m s −1 .…”

Section: Introductionmentioning

confidence: 85%

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Hybrid-Lambda: A low specific rating rotor concept for offshore wind turbines

Ribnitzky

Berger

Petrović

et al. 2023

Preprint

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Abstract. We introduce an aerodynamic rotor concept for an offshore wind turbine which is tailored for an increased power feed-in at low wind speeds by a substantial increase of the rotor diameter while maintaining the rated power. The main objective of the conceptual design is to limit the quasi-steady loads (blade flapwise root bending moment (RBM) and thrust) to the maximum values of a reference turbine. The outer part of the blade (i.e. outer 30 % span) is designed for a higher design tip speed ratio (TSR) and a lower axial induction than the inner part. By operating at the high TSR in light winds, the slender outer part fully contributes to the increased power capture. In stronger winds the TSR is reduced and the torque generation is shifted to the inner section of the rotor. Moreover, the blade design efficiently reduces the power losses when the flapwise RBM is limited through peak shaving, below rated wind speed. This is of high importance, given the wind speed distribution at offshore sites. The characteristics of the rotor are first investigated with stationary blade element momentum simulations and further analyzed with aeroelastic simulations, considering the flexibility of blades and tower to show that a structural design is feasible even for a blade of this size and complexity. The economic revenue and the cost of valued energy of the turbine is estimated and compared to the IEA 15 MW offshore reference turbine, considering a fictitious wind speed-dependent feed-in price. Our results for the turbine concept with an increase of rotor diameter by 36 % show that the revenue can be increased by 30 % and the cost of valued energy can be reduced by 16 % compared to the reference turbine.

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Section: Introductionmentioning

confidence: 85%

“…Several investigations (e.g. Hirth and Müller (2016), Johnson et al (2021), Wiser et al (2021)) state that turbines with larger swept rotor areas in relation to rated power are beneficial for the energy system. Thus, an increased and more steady power feed-in at low wind speeds would be desirable.…”

Section: Introductionmentioning

confidence: 99%

Hybrid-Lambda: A low specific rating rotor concept for offshore wind turbines

Ribnitzky

Berger

Petrović

et al. 2023

Preprint

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show abstract

“…The mass scaling exponents used in this analysis are a function of spar-cap reinforcement fiber (carbon fiber or fiberglass) and vary slightly for offshore versus land-based machines, mostly a result of higher wind speed sites offshore. The scaling exponent varies further within this discretization for specified design configurations and wind classification, so the values used are averages based on recent design models (Ennis et al 2019;Johnson et al 2021;Gaertner et al 2020) and based on blade mass for relevant commercial wind turbine blades. When using pultruded spar material, fully cured pultruded planks are added in the blade mold with the dry fabric and core material for the VARTM infusion to adhere the pultruded planks to the rest of the blade materials.…”

Section: D8 Wind Turbine: Bladementioning

confidence: 99%

Materials Used in U.S. Wind Energy Technologies: Quantities and Availability for Two Future Scenarios

Eberle,

Cooperman,

Walzberg

et al. 2023

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“…Land-based wind and offshore wind market reports describe trends in installation, industry, technology, performance, and cost (R. Wiser et al 2023;Musial et al 2022). Other engineering assessment and expert elicitation studies explore how technology innovations might enable cost reductions and performance improvements and thereby increase deployment of wind energy technologies (Dykes et al 2017;Nicholas Johnson et al 2019;Nick Johnson et al 2021;Verdolini et al 2018;R. Wiser et al 2021;Bolinger et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…5 MW and 6 MW offered by General Electric, Nordex, Siemens Gamesa Renewable Energy, and Vestas. Transport costs do not capture site-specific transport costs, but average site costs were based on current and near-future turbines as reported by the U.S. Department of Energy's Big Adaptive Rotor project(Nick Johnson et al 2021). This report is available at no cost from the National Renewable Energy Laboratory at www.nrel.gov/publications.11 of scale for…”

mentioning

confidence: 99%

Incorporating Wind Turbine Choice in High-Resolution Geospatial Supply Curve and Capacity Expansion Models

Eberle,

Mai,

Roberts

et al. 2024

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Wind energy is a growing source of electricity generation in the United States and provided more than 10% of total U.S. utility-scale electricity generation in 2022 (U.S. Energy Information Administration 2023). To achieve national decarbonization goals, U.S. annual deployment of wind energy will need to increase by at least fivefold compared to the recent past (United States Department of State and the United States Executive Office of the President 2021; Denholm et al. 2022;Jenkins et al. 2021). Modeling and analysis tools can be used to inform how to enable these increased levels of wind energy deployment. For example, prior research has quantified the costs, benefits, and other impacts of wind energy technologies and assessed how wind energy might contribute to decarbonization goals. However, most of these prior studies relied on generalized representations of wind energy technologies (e.g., a single wind turbine or an average capacity density). These generalized approaches did not allow the studies to evaluate how multiple wind energy technologies might perform under a range of siting conditions.

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Big Adaptive Rotor Phase I (Final Report)

Cited by 4 publications

References 27 publications

Hybrid-Lambda: A low specific rating rotor concept for offshore wind turbines

Hybrid-Lambda: A low specific rating rotor concept for offshore wind turbines

Materials Used in U.S. Wind Energy Technologies: Quantities and Availability for Two Future Scenarios

Incorporating Wind Turbine Choice in High-Resolution Geospatial Supply Curve and Capacity Expansion Models

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