National Library of Energy BETA

Sample records for wind turbine operates

  1. Optimization of Wind Turbine Operation

    E-Print Network [OSTI]

    Optimization of Wind Turbine Operation by Use of Spinner Anemometer TF Pedersen, NN Sørensen, L Title: Optimization of Wind Turbine Operation by Use of Spinner Anemometer Department: Wind Energy prototype wind turbine. Statistics of the yaw error showed an average of about 10°. The average flow

  2. the risk issue of wind measurement for wind turbine operation

    E-Print Network [OSTI]

    Leu, Tzong-Shyng "Jeremy"

    Sciences, National Taiwan University #12;outline · Wind measurement in meteorology and wind farm design-related issues on wind turbine operation 3/31/2011 2 #12;WIND MEASUREMENT IN METEOROLOGY & WIND FARM DESIGN 3://www.atm.ncu.edu.tw/93/wind/ MM5 simulation (1996~2000 database) Wind speed (m/s) at 50mWind power (100W/m2) at 50m http://wind.itri.org.tw/wind

  3. Data Analytics Methods in Wind Turbine Design and Operations 

    E-Print Network [OSTI]

    Lee, Giwhyun

    2013-05-22

    This dissertation develops sophisticated data analytic methods to analyze structural loads on, and power generation of, wind turbines. Wind turbines, which convert the kinetic energy in wind into electrical power, are operated within stochastic...

  4. Wind turbine generator with improved operating subassemblies

    DOE Patents [OSTI]

    Cheney, Jr., Marvin C. (24 Stonepost Rd., Glastonbury, CT 06033)

    1985-01-01

    A wind turbine includes a yaw spring return assembly to return the nacelle from a position to which it has been rotated by yawing forces, thus preventing excessive twisting of the power cables and control cables. It also includes negative coning restrainers to limit the bending of the flexible arms of the rotor towards the tower, and stop means on the rotor shaft to orient the blades in a vertical position during periods when the unit is upwind when the wind commences. A pendulum pitch control mechanism is improved by orienting the pivot axis for the pendulum arm at an angle to the longitudinal axis of its support arm, and excessive creep is of the synthetic resin flexible beam support for the blades is prevented by a restraining cable which limits the extent of pivoting of the pendulum during normal operation but which will permit further pivoting under abnormal conditions to cause the rotor to stall.

  5. Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine

    E-Print Network [OSTI]

    Hoen, Ben

    2010-01-01

    Noise Operations of Wind Turbines on Neighbor Annoyance: ANoise Operations of Wind Turbines on Neighbor Annoyance: A

  6. Wind turbine reliability :understanding and minimizing wind turbine operation and maintenance costs.

    SciTech Connect (OSTI)

    Walford, Christopher A. (Global Energy Concepts. Kirkland, WA)

    2006-03-01

    Wind turbine system reliability is a critical factor in the success of a wind energy project. Poor reliability directly affects both the project's revenue stream through increased operation and maintenance (O&M) costs and reduced availability to generate power due to turbine downtime. Indirectly, the acceptance of wind-generated power by the financial and developer communities as a viable enterprise is influenced by the risk associated with the capital equipment reliability; increased risk, or at least the perception of increased risk, is generally accompanied by increased financing fees or interest rates. This paper outlines the issues relevant to wind turbine reliability for wind turbine power generation projects. The first sections describe the current state of the industry, identify the cost elements associated with wind farm O&M and availability and discuss the causes of uncertainty in estimating wind turbine component reliability. The latter sections discuss the means for reducing O&M costs and propose O&M related research and development efforts that could be pursued by the wind energy research community to reduce cost of energy.

  7. www.cesos.ntnu.no Author Centre for Ships and Ocean Structures Offshore Wind Turbine Operation

    E-Print Network [OSTI]

    Nørvåg, Kjetil

    1 www.cesos.ntnu.no Author ­ Centre for Ships and Ocean Structures Offshore Wind Turbine Operation Structures Outline · Introduction · Wind Turbine Operational Conditions · Wind Turbine Operation under Atmospheric Icing · Wind Turbine Operation under Fault Condition · Conclusions www.cesos.ntnu.no M. Etemaddar

  8. Operational behavior of a double-fed permanent magnet generator for wind turbines

    E-Print Network [OSTI]

    Reddy, Sivananda Kumjula

    2005-01-01

    Greater efficiency in wind turbine systems is achieved by allowing the rotor to change its rate of rotation as the wind speed changes. The wind turbine system is decoupled from the utility grid and a variable speed operation ...

  9. Wind turbine

    DOE Patents [OSTI]

    Cheney, Jr., Marvin C. (Glastonbury, CT)

    1982-01-01

    A wind turbine of the type having an airfoil blade (15) mounted on a flexible beam (20) and a pitch governor (55) which selectively, torsionally twists the flexible beam in response to wind turbine speed thereby setting blade pitch, is provided with a limiter (85) which restricts unwanted pitch change at operating speeds due to torsional creep of the flexible beam. The limiter allows twisting of the beam by the governor under excessive wind velocity conditions to orient the blades in stall pitch positions, thereby preventing overspeed operation of the turbine. In the preferred embodiment, the pitch governor comprises a pendulum (65,70) which responds to changing rotor speed by pivotal movement, the limiter comprising a resilient member (90) which engages an end of the pendulum to restrict further movement thereof, and in turn restrict beam creep and unwanted blade pitch misadjustment.

  10. Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine

    E-Print Network [OSTI]

    Hoen, Ben

    2010-01-01

    only self-reported wind and turbine sound levels were used.Noise Operations of Wind Turbines on Neighbor Annoyance: ANoise Operations of Wind Turbines on Neighbor Annoyance: A

  11. Management and Conservation Article Behavioral Responses of Bats to Operating Wind Turbines

    E-Print Network [OSTI]

    Holberton, Rebecca L.

    Management and Conservation Article Behavioral Responses of Bats to Operating Wind Turbines JASON W used thermal infrared (TIR) cameras to assess the flight behavior of bats at wind turbines because turbines. We recorded nightly 9-hour sessions of TIR video of operating turbines from which we assessed

  12. OPERATIONAL MODAL ANALYSIS AND WAVELET TRANSFORMATION FOR DAMAGE IDENTIFICATION IN WIND TURBINE BLADES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    OPERATIONAL MODAL ANALYSIS AND WAVELET TRANSFORMATION FOR DAMAGE IDENTIFICATION IN WIND TURBINE turbine blade. A trail- ing edge debonding was introduced to a SSP 34 m blade mounted on a test rig. Op-frequency modes. KEYWORDS : Wind Turbine Blades, Debonding, Wavelet Transformation, Operational Modal Analysis

  13. Operational-Condition-Independent Criteria Dedicated to Monitoring Wind Turbine Generators: Preprint

    SciTech Connect (OSTI)

    Yang, W.; Sheng, S.; Court, R.

    2012-08-01

    To date the existing wind turbine condition monitoring technologies and commercially available systems have not been fully accepted for improving wind turbine availability and reducing their operation and maintenance costs. One of the main reasons is that wind turbines are subject to constantly varying loads and operate at variable rotational speeds. As a consequence, the influences of turbine faults and the effects of varying load and speed are coupled together in wind turbine condition monitoring signals. So, there is an urgent need to either introduce some operational condition de-coupling procedures into the current wind turbine condition monitoring techniques or develop a new operational condition independent wind turbine condition monitoring technique to maintain high turbine availability and achieve the expected economic benefits from wind. The purpose of this paper is to develop such a technique. In the paper, three operational condition independent criteria are developed dedicated for monitoring the operation and health condition of wind turbine generators. All proposed criteria have been tested through both simulated and practical experiments. The experiments have shown that these criteria provide a solution for detecting both mechanical and electrical faults occurring in wind turbine generators.

  14. Energy 101: Wind Turbines

    ScienceCinema (OSTI)

    None

    2013-05-29

    See how wind turbines generate clean electricity from the power of the wind. Highlighted are the various parts and mechanisms of a modern wind turbine.

  15. Energy 101: Wind Turbines

    SciTech Connect (OSTI)

    None

    2011-01-01

    See how wind turbines generate clean electricity from the power of the wind. Highlighted are the various parts and mechanisms of a modern wind turbine.

  16. How Does a Wind Turbine Work? | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    How Does a Wind Turbine Work? How Does a Wind Turbine Work? How does a wind turbine work? Previous Next Wind turbines operate on a simple principle. The energy in the wind turns...

  17. Model Predictive Control Wind Turbines

    E-Print Network [OSTI]

    Model Predictive Control of Wind Turbines Martin Klauco Kongens Lyngby 2012 IMM-MSc-2012-65 #12;Summary Wind turbines are the biggest part of the green energy industry. Increasing interest control strategies. Control strategy has a significant impact on the wind turbine operation on many levels

  18. LiDAR observations of offshore winds at future wind turbine operating heights

    E-Print Network [OSTI]

    at the Horns Rev offshore wind farm. The influence of atmospheric stability on the surface layer wind shear of offshore wind farms in the coming years. In contrast with the situation over land, the knowledge turbine manufacturers and wind farm developers, although the offshore environment represents other

  19. Investigation of Response Amplitude Operators for Floating Offshore Wind Turbines: Preprint

    SciTech Connect (OSTI)

    Ramachandran, G. K. V.; Robertson, A.; Jonkman, J. M.; Masciola, M. D.

    2013-07-01

    This paper examines the consistency between response amplitude operators (RAOs) computed from WAMIT, a linear frequency-domain tool, to RAOs derived from time-domain computations based on white-noise wave excitation using FAST, a nonlinear aero-hydro-servo-elastic tool. The RAO comparison is first made for a rigid floating wind turbine without wind excitation. The investigation is further extended to examine how these RAOs change for a flexible and operational wind turbine. The RAOs are computed for below-rated, rated, and above-rated wind conditions. The method is applied to a floating wind system composed of the OC3-Hywind spar buoy and NREL 5-MW wind turbine. The responses are compared between FAST and WAMIT to verify the FAST model and to understand the influence of structural flexibility, aerodynamic damping, control actions, and waves on the system responses. The results show that based on the RAO computation procedure implemented, the WAMIT- and FAST-computed RAOs are similar (as expected) for a rigid turbine subjected to waves only. However, WAMIT is unable to model the excitation from a flexible turbine. Further, the presence of aerodynamic damping decreased the platform surge and pitch responses, as computed by both WAMIT and FAST when wind was included. Additionally, the influence of gyroscopic excitation increased the yaw response, which was captured by both WAMIT and FAST.

  20. Diffuser Augmented Wind Turbine Analysis Code

    E-Print Network [OSTI]

    Carroll, Jonathan

    2014-05-31

    , it is necessary to develop innovative wind capturing devices that can produce energy in the locations where large conventional horizontal axis wind turbines (HAWTs) are too impractical to install and operate. A diffuser augmented wind turbine (DAWT) is one...

  1. Earthquake Response Modeling for a Parked and Operating Megawatt-Scale Wind Turbine

    SciTech Connect (OSTI)

    Prowell, I.; Elgamal, A.; Romanowitz, H.; Duggan, J. E.; Jonkman, J.

    2010-10-01

    Demand parameters for turbines, such as tower moment demand, are primarily driven by wind excitation and dynamics associated with operation. For that purpose, computational simulation platforms have been developed, such as FAST, maintained by the National Renewable Energy Laboratory (NREL). For seismically active regions, building codes also require the consideration of earthquake loading. Historically, it has been common to use simple building code approaches to estimate the structural demand from earthquake shaking, as an independent loading scenario. Currently, International Electrotechnical Commission (IEC) design requirements include the consideration of earthquake shaking while the turbine is operating. Numerical and analytical tools used to consider earthquake loads for buildings and other static civil structures are not well suited for modeling simultaneous wind and earthquake excitation in conjunction with operational dynamics. Through the addition of seismic loading capabilities to FAST, it is possible to simulate earthquake shaking in the time domain, which allows consideration of non-linear effects such as structural nonlinearities, aerodynamic hysteresis, control system influence, and transients. This paper presents a FAST model of a modern 900-kW wind turbine, which is calibrated based on field vibration measurements. With this calibrated model, both coupled and uncoupled simulations are conducted looking at the structural demand for the turbine tower. Response is compared under the conditions of normal operation and potential emergency shutdown due the earthquake induced vibrations. The results highlight the availability of a numerical tool for conducting such studies, and provide insights into the combined wind-earthquake loading mechanism.

  2. Reducing Bat Fatalities From Interactions with Operating Wind Turbines (Fact Sheet)

    SciTech Connect (OSTI)

    Lawson, M.

    2013-11-01

    One of the biggest advantages of wind energy is that, overall, it has fewer negative impacts on the environment than fossil fuel-generated energy. Most professionals in the wind industry would like to reduce the impact of energy generation on plants, animals, and their habitats. This is why the industry is highly motivated to find out why migrating bats have unexpectedly high fatality rates near operating wind farms. New research has provided quantitative data that indicates barotrauma is not a major cause of bat deaths around operating turbines.

  3. Fatigue Analysis of Wind Turbines Issued by Sandia National Laboratories, operated for the United States

    E-Print Network [OSTI]

    On the Fatigue Analysis of Wind Turbines *"f~-9,a, ,.*,. ,^__.c #12;Issued by Sandia National-0089 Unlimited Release Printed June 1999 On the Fatigue Analysis of Wind Turbines by Herbert J. Sutherland Sandia National Laboratories P.O. Box 5800 Albuquerque, New Mexico 87185-0708 Abstract Modern wind turbines

  4. Scale Models & Wind Turbines

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Turbines * Readings about Cape Wind and other offshore and onshore siting debates for wind farms * Student Worksheet * A number of scale model items: Ken, Barbie or other dolls...

  5. Wind Turbine Tribology Seminar

    Broader source: Energy.gov [DOE]

    Wind turbine reliability issues are often linked to failures of contacting components, such as bearings, gears, and actuators. Therefore, special consideration to tribological design in wind...

  6. Session: Development and application of guidelines for siting, constructing, operating and monitoring wind turbines

    SciTech Connect (OSTI)

    Manville, Albert; Hueckel, Greg

    2004-09-01

    This session at the Wind Energy and Birds/Bats workshop consisted of two presentations followed by a discussion/question and answer period. The two papers were: 'Development and Application of USFWS Guidance for Site Evaluation, Siting, Construction, Operation and Monitoring of Wind Turbines' by Albert Manville and 'Wind Power in Washington State' by Greg Hueckel. The session provided a comparison of wind project guidelines developed by the U.S. Fish and Wildlife Service (USFWS) in May 2003 and the Washington State Department of Fish and Wildlife in August 2003. Questions addressed included: is there a need or desire for uniform national or state criteria; can other states learn from Washington State's example, or from the USFWS voluntary guidelines; should there be uniform requirements/guidelines/check-lists for the siting, operation, monitoring, and mitigation to prevent or minimize avian, bat, and other wildlife impacts.

  7. Wind Turbines Benefit Crops

    ScienceCinema (OSTI)

    Takle, Gene

    2013-03-01

    Ames Laboratory associate scientist Gene Takle talks about research into the effect of wind turbines on nearby crops. Preliminary results show the turbines may have a positive effect by cooling and drying the crops and assisting with carbon dioxide uptake.

  8. Wind Turbines Benefit Crops

    SciTech Connect (OSTI)

    Takle, Gene

    2010-01-01

    Ames Laboratory associate scientist Gene Takle talks about research into the effect of wind turbines on nearby crops. Preliminary results show the turbines may have a positive effect by cooling and drying the crops and assisting with carbon dioxide uptake.

  9. Optimum propeller wind turbines

    SciTech Connect (OSTI)

    Sanderson, R.J.; Archer, R.D.

    1983-11-01

    The Prandtl-Betz-Theodorsen theory of heavily loaded airscrews has been adapted to the design of propeller windmills which are to be optimized for maximum power coefficient. It is shown that the simpler, light-loading, constant-area wake assumption can generate significantly different ''optimum'' performance and geometry, and that it is therefore not appropriate to the design of propeller wind turbines when operating in their normal range of high-tip-speed-to-wind-speed ratio. Design curves for optimum power coefficient are presented and an example of the design of a typical two-blade optimum rotor is given.

  10. 20% Wind Energy by 2030 - Chapter 2: Wind Turbine Technology...

    Office of Environmental Management (EM)

    - Chapter 2: Wind Turbine Technology Summary Slides 20% Wind Energy by 2030 - Chapter 2: Wind Turbine Technology Summary Slides Summary slides for wind turbine technology, its...

  11. Application of a wireless sensor node to health monitoring of operational wind turbine blades

    SciTech Connect (OSTI)

    Taylor, Stuart G; Farinholt, Kevin M; Park, Gyuhae; Farrar, Charles R; Todd, Michael D

    2009-01-01

    Structural health monitoring (SHM) is a developing field of research with a variety of applications including civil structures, industrial equipment, and energy infrastructure. An SHM system requires an integrated process of sensing, data interrogation and statistical assessment. The first and most important stage of any SHM system is the sensing system, which is traditionally composed of transducers and data acquisition hardware. However, such hardware is often heavy, bulky, and difficult to install in situ. Furthermore, physical access to the structure being monitored may be limited or restricted, as is the case for rotating wind turbine blades or unmanned aerial vehicles, requiring wireless transmission of sensor readings. This study applies a previously developed compact wireless sensor node to structural health monitoring of rotating small-scale wind turbine blades. The compact sensor node collects low-frequency structural vibration measurements to estimate natural frequencies and operational deflection shapes. The sensor node also has the capability to perform high-frequency impedance measurements to detect changes in local material properties or other physical characteristics. Operational measurements were collected using the wireless sensing system for both healthy and damaged blade conditions. Damage sensitive features were extracted from the collected data, and those features were used to classify the structural condition as healthy or damaged.

  12. Direct drive wind turbine

    DOE Patents [OSTI]

    Bywaters, Garrett Lee; Danforth, William; Bevington, Christopher; Stowell, Jesse; Costin, Daniel

    2006-09-19

    A wind turbine is provided that minimizes the size of the drive train and nacelle while maintaining the power electronics and transformer at the top of the tower. The turbine includes a direct drive generator having an integrated disk brake positioned radially inside the stator while minimizing the potential for contamination. The turbine further includes a means for mounting a transformer below the nacelle within the tower.

  13. Direct drive wind turbine

    DOE Patents [OSTI]

    Bywaters, Garrett; Danforth, William; Bevington, Christopher; Jesse, Stowell; Costin, Daniel

    2007-02-27

    A wind turbine is provided that minimizes the size of the drive train and nacelle while maintaining the power electronics and transformer at the top of the tower. The turbine includes a direct drive generator having an integrated disk brake positioned radially inside the stator while minimizing the potential for contamination. The turbine further includes a means for mounting a transformer below the nacelle within the tower.

  14. Direct drive wind turbine

    DOE Patents [OSTI]

    Bywaters, Garrett; Danforth, William; Bevington, Christopher; Stowell, Jesse; Costin, Daniel

    2006-07-11

    A wind turbine is provided that minimizes the size of the drive train and nacelle while maintaining the power electronics and transformer at the top of the tower. The turbine includes a direct drive generator having an integrated disk brake positioned radially inside the stator while minimizing the potential for contamination. The turbine further includes a means for mounting a transformer below the nacelle within the tower.

  15. Direct drive wind turbine

    DOE Patents [OSTI]

    Bywaters, Garrett; Danforth, William; Bevington, Christopher; Jesse, Stowell; Costin, Daniel

    2006-10-10

    A wind turbine is provided that minimizes the size of the drive train and nacelle while maintaining the power electronics and transformer at the top of the tower. The turbine includes a direct drive generator having an integrated disk brake positioned radially inside the stator while minimizing the potential for contamination. The turbine further includes a means for mounting a transformer below the nacelle within the tower.

  16. Vertical axis wind turbines

    DOE Patents [OSTI]

    Krivcov, Vladimir (Miass, RU); Krivospitski, Vladimir (Miass, RU); Maksimov, Vasili (Miass, RU); Halstead, Richard (Rohnert Park, CA); Grahov, Jurij (Miass, RU)

    2011-03-08

    A vertical axis wind turbine is described. The wind turbine can include a top ring, a middle ring and a lower ring, wherein a plurality of vertical airfoils are disposed between the rings. For example, three vertical airfoils can be attached between the upper ring and the middle ring. In addition, three more vertical airfoils can be attached between the lower ring and the middle ring. When wind contacts the vertically arranged airfoils the rings begin to spin. By connecting the rings to a center pole which spins an alternator, electricity can be generated from wind.

  17. Wind Turbine Acoustic Noise A white paper

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    Wind Turbine Acoustic Noise A white paper Prepared by the Renewable Energy Research Laboratory...................................................................... 8 Sound from Wind Turbines .............................................................................................. 10 Sources of Wind Turbine Sound

  18. How a Wind Turbine Works | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Works June 20, 2014 - 9:09am Addthis How does a wind turbine work? Previous Next Wind turbines operate on a simple principle. The energy in the wind turns two or three...

  19. Wind Turbine Blockset General Overview

    E-Print Network [OSTI]

    Wind Turbine Blockset in Saber General Overview and Description of the Models Florin Iov, Adrian Turbine Blockset in Saber Abstract. This report presents a new developed Saber Toolbox for wind turbine, optimize and design wind turbines". The report provides a quick overview of the Saber and then explains

  20. How Does a Wind Turbine Work?

    Office of Energy Efficiency and Renewable Energy (EERE)

    Wind turbines operate on a simple principle. The energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which spins a generator to...

  1. On the Fatigue Analysis of Wind Turbines

    SciTech Connect (OSTI)

    Sutherland, Herbert J.

    1999-06-01

    Modern wind turbines are fatigue critical machines that are typically used to produce electrical power from the wind. Operational experiences with these large rotating machines indicated that their components (primarily blades and blade joints) were failing at unexpectedly high rates, which led the wind turbine community to develop fatigue analysis capabilities for wind turbines. Our ability to analyze the fatigue behavior of wind turbine components has matured to the point that the prediction of service lifetime is becoming an essential part of the design process. In this review paper, I summarize the technology and describe the ''best practices'' for the fatigue analysis of a wind turbine component. The paper focuses on U.S. technology, but cites European references that provide important insights into the fatigue analysis of wind turbines.

  2. Wind turbine rotor aileron

    DOE Patents [OSTI]

    Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT)

    1994-06-14

    A wind turbine has a rotor with at least one blade which has an aileron which is adjusted by an actuator. A hinge has two portions, one for mounting a stationary hinge arm to the blade, the other for coupling to the aileron actuator. Several types of hinges can be used, along with different actuators. The aileron is designed so that it has a constant chord with a number of identical sub-assemblies. The leading edge of the aileron has at least one curved portion so that the aileron does not vent over a certain range of angles, but vents if the position is outside the range. A cyclic actuator can be mounted to the aileron to adjust the position periodically. Generally, the aileron will be adjusted over a range related to the rotational position of the blade. A method for operating the cyclic assembly is also described.

  3. Airborne Wind Turbine

    SciTech Connect (OSTI)

    2010-09-01

    Broad Funding Opportunity Announcement Project: Makani Power is developing an Airborne Wind Turbine (AWT) that eliminates 90% of the mass of a conventional wind turbine and accesses a stronger, more consistent wind at altitudes of near 1,000 feet. At these altitudes, 85% of the country can offer viable wind resources compared to only 15% accessible with current technology. Additionally, the Makani Power wing can be economically deployed in deep offshore waters, opening up a resource which is 4 times greater than the entire U.S. electrical generation capacity. Makani Power has demonstrated the core technology, including autonomous launch, land, and power generation with an 8 meter wingspan, 20 kW prototype. At commercial scale, Makani Power aims to develop a 600 kW, 28 meter wingspan product capable of delivering energy at an unsubsidized cost competitive with coal, the current benchmark for low-cost power.

  4. Tornado type wind turbines

    DOE Patents [OSTI]

    Hsu, Cheng-Ting (Ames, IA)

    1984-01-01

    A tornado type wind turbine has a vertically disposed wind collecting tower with spaced apart inner and outer walls and a central bore. The upper end of the tower is open while the lower end of the structure is in communication with a wind intake chamber. An opening in the wind chamber is positioned over a turbine which is in driving communication with an electrical generator. An opening between the inner and outer walls at the lower end of the tower permits radially flowing air to enter the space between the inner and outer walls while a vertically disposed opening in the wind collecting tower permits tangentially flowing air to enter the central bore. A porous portion of the inner wall permits the radially flowing air to interact with the tangentially flowing air so as to create an intensified vortex flow which exits out of the top opening of the tower so as to create a low pressure core and thus draw air through the opening of the wind intake chamber so as to drive the turbine.

  5. Wind turbine spoiler

    DOE Patents [OSTI]

    Sullivan, William N. (Albuquerque, NM)

    1985-01-01

    An aerodynamic spoiler system for a vertical axis wind turbine includes spoilers on the blades initially stored near the rotor axis to minimize drag. A solenoid latch adjacent the central support tower releases the spoilers and centrifugal force causes the spoilers to move up the turbine blades away from the rotor axis, thereby producing a braking effect and actual slowing of the associated wind turbine, if desired. The spoiler system can also be used as an infinitely variable power control by regulated movement of the spoilers on the blades over the range between the undeployed and fully deployed positions. This is done by the use of a suitable powered reel and cable located at the rotor tower to move the spoilers.

  6. Dynamics and Fatigue Damage of Wind Turbine Rotors

    E-Print Network [OSTI]

    6 3 RiS0-Rr512 Dynamics and Fatigue Damage of Wind Turbine Rotors during Steady Operation Peter OF WIND TURBINE ROTORS DURING STEADY OPERATION Peter Hauge Madsen, Sten Frandsen, William E. Holley-carrying capacity of a wind turbine rotor with respect to short-term strength and material fatigue are presented

  7. Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine

    SciTech Connect (OSTI)

    Hoen, Ben; Wiser, Ryan; Eckholdt, Haftan

    2010-06-23

    Neighbors living near the 3 turbine, 4.5 MW Vinalhaven, Maine wind power facility, which began operations in late 2009, have complained that the noise from the turbines is unwelcome and annoying. Fox Islands Wind, the owner of the facility, hypothesized that implementing a Noise Reduced Operation (NRO) for the turbines, which effectively limits the turbines maximum rpm and power output, would reduce the sound levels produced by the turbines, and therefore might also reduce the degree to which the neighbors report being annoyed by those sounds. To test this hypothesis in a preliminary fashion, a pilot study was conducted in early 2010, the results of which are the subject of this brief report. The study included asking near-by residents - those within roughly 3000 feet - to rate the sounds and the degree to which they were annoyed by them using logs which they filled out at multiple times during the day on as many days as were possible in the 35 day study period in February and March, 2010. Meanwhile, FIW adjusted the NRO settings of the turbines in a random fashion in the evenings during the same period, but in a pattern that the respondents were not made aware of. Ultimately, nine individuals turned in roughly 200 log entries (i.e., responses), each of which was time coded to allow testing if the response was correlated with the wind facility operating conditions at that time. The analysis of these data found small, non-statistically-significant differences in self-reported turbine loudness and annoyance ratings between the periods when the NRO was enacted and when it was not, after controlling for many of the relationships that could independently influence perceived loudness and annoyance (e.g., wind direction, time of day). Possible explanations for these small differences in self-reported turbine loudness and annoyance ratings include: the relative difference in sound output from the turbines when NRO was engaged and when it was not was small; and/or that differences in turbine sound outputs that did exist might have been masked by higher (non-turbine) wind sound levels that were coincident with NRO periods. Because this preliminary test only included a small portion of the population surrounding the turbines, the sample of self-reported ratings was itself very small. In addition, the conditions varied greatly over the study period, as described in the report that follows. Consequently, the results presented here should be considered preliminary, and further data collection and analysis are warranted. The main findings of this preliminary study are: (1) As planned, periods in which the NRO was engaged were found to have noticeably lower turbine rotational speeds (rpm), based on turbine operational data. (2) 11% of responses overall indicated that the turbines were perceived as either 'very' or 'extremely' loud at the time they were logged, and roughly two thirds of those (7% overall) indicated the sounds to be 'very' or 'extremely' annoying. (3) Self-reported turbine loudness and annoyance ratings were higher during the night and when the wind was from the North (participants in the study were located to the east and south of the turbines). (4) Self-reported turbine loudness and annoyance ratings were generally found to be lower during the NRO periods, but these observed differences are relatively small in magnitude, and are not statistically significant. (5) There is some limited evidence that high-speed surface winds mask self-reported turbine loudness and annoyance ratings. Therefore, because NRO settings are only engaged during periods of high winds, the true effects of the NRO adjustments might be diluted to some degree. (6) The results of this preliminary assessment should not be applied to the full population of homeowners near the turbines in Vinalhaven, Maine because the potentially most-sensitive individuals (those most vocal of their dislike of the turbine sounds) opted not to participate in the study, and because the study did not include the relatively large number of individuals who primarily visit the

  8. Airfoils for wind turbine

    DOE Patents [OSTI]

    Tangler, James L. (Boulder, CO); Somers, Dan M. (State College, PA)

    1996-01-01

    Airfoils for the blade of a wind turbine wherein each airfoil is characterized by a thickness in a range from 16%-24% and a maximum lift coefficient designed to be largely insensitive to roughness effects. The airfoils include a family of airfoils for a blade 15 to 25 meters in length, a family of airfoils for a blade 1 to 5 meters in length, and a family of airfoils for a blade 5 to 10 meters in length.

  9. Airfoils for wind turbine

    DOE Patents [OSTI]

    Tangler, J.L.; Somers, D.M.

    1996-10-08

    Airfoils are disclosed for the blade of a wind turbine wherein each airfoil is characterized by a thickness in a range from 16%-24% and a maximum lift coefficient designed to be largely insensitive to roughness effects. The airfoils include a family of airfoils for a blade 15 to 25 meters in length, a family of airfoils for a blade 1 to 5 meters in length, and a family of airfoils for a blade 5 to 10 meters in length. 10 figs.

  10. RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT)

    E-Print Network [OSTI]

    Bernstein, Joseph B.

    RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT) Yizhou Lu, T. M. Delorm, A. Christou of survivor functions R(t) of drive-trains, after 1 year of operation, between Offshore Wind Turbine (OWT) vs of the reliability of these 5 Types Surrogate failure rate data Onshore wind turbines (OT) 1-1.5MW CONCLUSIONS

  11. SOUND COMPLIANCE MONITORING FOR THE GAMESA WIND TURBINE

    E-Print Network [OSTI]

    Firestone, Jeremy

    SOUND COMPLIANCE MONITORING FOR THE GAMESA WIND TURBINE UD - LEWES, DELAWARE January 2011 ` #12;SOUND COMPLIANCE MONITORING FOR THE GAMESA WIND TURBINE AT THE UNIVERSITY OF DELAWARE LEWES, DELAWARE A Gamesa G90 2.0-MW wind turbine operates at the University of Delaware (UD), Lewes campus on a parcel

  12. Condition Monitoring of Wind Turbines Based on Amplitude Demodulation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Condition Monitoring of Wind Turbines Based on Amplitude Demodulation Yassine Amirat University. In order to make wind turbine reliable and competitive, it is important to reduce the operational-stationary behavior. Index Terms--Wind turbine, Fault Detection, Bearings, Signal Processing, Amplitude Modulation I

  13. Wind Turbine Safety and Function Test Report for the Mariah Windspire Wind Turbine

    SciTech Connect (OSTI)

    Huskey, A.; Bowen, A.; Jager, D.

    2010-07-01

    This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers to wind energy expansion by providing independent testing results for small wind turbines (SWT). In total, five turbines were tested at the National Wind Technology Center (NWTC) as a part of this project. Safety and function testing is one of up to five tests performed on the turbines, including power performance, duration, noise, and power-quality tests. NWTC testing results provide manufacturers with reports that may be used to meet part of small wind turbine certification requirements. The test equipment includes a Mariah Windspire wind turbine mounted on a monopole tower. L&E Machine manufactured the turbine in the United States. The inverter was manufactured separately by Technology Driven Products in the United States. The system was installed by the NWTC site operations group with guidance and assistance from Mariah Power.

  14. Wind Turbine Generator KanaKanapathipillai

    E-Print Network [OSTI]

    New South Wales, University of

    Wind Turbine Generator Noise KanaKanapathipillai Reliable and accurate measurement of wind turbine & Associates on wind turbine noise for a number of years. Treatment for Presbyopia Hooman M. Pour Presbyopia

  15. Computational Aerodynamics and Aeroacoustics for Wind Turbines

    E-Print Network [OSTI]

    Computational Aerodynamics and Aeroacoustics for Wind Turbines #12;#12;Computational Aerodynamics and Aeroacoustics for Wind Turbines Wen Zhong Shen Fluid Mechanics Department of Mechanical Engineering TECHNICAL Shen, Wen Zhong Computational Aerodynamics and Aeroacoustics for Wind Turbines Doctor Thesis Technical

  16. PowerJet Wind Turbine Project

    SciTech Connect (OSTI)

    Bartlett, Raymond J

    2008-11-30

    PROJECT OBJECTIVE The PowerJet wind turbine overcomes problems characteristic of the small wind turbines that are on the market today by providing reliable output at a wide range of wind speeds, durability, silent operation at all wind speeds, and bird-safe operation. Prime Energy�s objective for this project was to design and integrate a generator with an electrical controller and mechanical controls to maximize the generation of electricity by its wind turbine. The scope of this project was to design, construct and test a mechanical back plate to control rotational speed in high winds, and an electronic controller to maximize power output and to assist the base plate in controlling rotational speed in high winds. The test model will continue to operate beyond the time frame of the project, with the ultimate goal of manufacturing and marketing the PowerJet worldwide. Increased Understanding of Electronic & Mechanical Controls Integrated With Electricity Generator The PowerJet back plate begins to open as wind speed exceeds 13.5 mps. The pressure inside the turbine and the turbine rotational speed are held constant. Once the back plate has fully opened at approximately 29 mps, the controller begins pulsing back to the generator to limit the rotational speed of the turbine. At a wind speed in excess of 29 mps, the controller shorts the generator and brings the turbine to a complete stop. As the wind speed subsides, the controller releases the turbine and it resumes producing electricity. Data collection and instrumentation problems prevented identification of the exact speeds at which these events occur. However, the turbine, controller and generator survived winds in excess of 36 mps, confirming that the two over-speed controls accomplished their purpose. Technical Effectiveness & Economic Feasibility Maximum Electrical Output The output of electricity is maximized by the integration of an electronic controller and mechanical over-speed controls designed and tested during the course of this project. The output exceeds that of the PowerJet�s 3-bladed counterparts (see Appendix). Durability All components of the PowerJet turbine assembly�including the electronic and mechanical controls designed, manufactured and field tested during the course of this project�proved to be durable through severe weather conditions, with constant operation and no interruption in energy production. Low Cost Materials for the turbine, generator, tower, charge controllers and ancillary parts are available at reasonable prices. Fabrication of these parts is also readily available worldwide. The cost of assembling and installing the turbine is reduced because it has fewer parts and requires less labor to manufacture and assemble, making it competitively priced compared with turbines of similar output manufactured in the U.S. and Europe. The electronic controller is the unique part to be included in the turbine package. The controllers can be manufactured in reasonably-sized production runs to keep the cost below $250 each. The data logger and 24 sensors are for research only and will be unnecessary for the commercial product. Benefit To Public The PowerJet wind-electric system is designed for distributed wind generation in 3 and 4 class winds. This wind turbine meets DOE�s requirements for a quiet, durable, bird-safe turbine that eventually can be deployed as a grid-connected generator in urban and suburban settings. Results As described more fully below and illustrated in the Appendices, the goals and objectives outlined in 2060 SOPO were fully met. Electronic and mechanical controls were successfully designed, manufactured and integrated with the generator. The turbine, tower, controllers and generators operated without incident throughout the test period, surviving severe winter and summer weather conditions such as extreme temperatures, ice and sustained high winds. The electronic controls were contained in weather-proof electrical boxes and the elec

  17. Wind tunnel performance data for the Darrieus wind turbine with...

    Office of Scientific and Technical Information (OSTI)

    Wind tunnel performance data for the Darrieus wind turbine with NACA 0012 blades Citation Details In-Document Search Title: Wind tunnel performance data for the Darrieus wind...

  18. Estimation of Wind Speed in Connection to a Wind Turbine

    E-Print Network [OSTI]

    Estimation of Wind Speed in Connection to a Wind Turbine X. Ma #3; , N. K. Poulsen #3; , H. Bindner y December 20, 1995 Abstract The wind speed varies over the rotor plane of wind turbine making the wind speed on the rotor plane will be estimated by using a wind turbine as a wind measuring device

  19. Wind Turbine Manufacturers in the U. S.: Locations and Local...

    Wind Powering America (EERE)

    Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Wind Turbine Manufacturers in the U.S.: Locations and Local Impacts WINDPOWER 2010 Conference...

  20. Installing Small Wind Turbines Seminar and Workshop

    E-Print Network [OSTI]

    Seminar and Workshop Installing Small Wind Turbines Seminar and Workshop Location: Murdoch January 2011 Details for Registration and Payment: Mr Daniel Jones, National Small Wind Turbine Test: The National Small Wind Turbine Centre at Murdoch University is holding a Small Wind Turbine short training

  1. Effects of Changing Atmospheric Conditions on Wind Turbine Performance (Poster)

    SciTech Connect (OSTI)

    Clifton, A.

    2012-12-01

    Multi-megawatt, utility-scale wind turbines operate in turbulent and dynamic winds that impact turbine performance in ways that are gradually becoming better understood. This poster presents a study made using a turbulent flow field simulator (TurbSim) and a Turbine aeroelastic simulator (FAST) of the response of a generic 1.5 MW wind turbine to changing inflow. The turbine power output is found to be most sensitive to wind speed and turbulence intensity, but the relationship depends on the wind speed with respect to the turbine's rated wind speed. Shear is found to be poorly correlated to power. A machine learning method called 'regression trees' is used to create a simple model of turbine performance that could be used as part of the wind resource assessment process. This study has used simple flow fields and should be extended to more complex flows, and validated with field observations.

  2. Wind Turbine Safety and Function Test Report for the ARE 442 Wind Turbine

    SciTech Connect (OSTI)

    van Dam, J.; Baker, D.; Jager, D.

    2010-02-01

    This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, four turbines were tested at the National Wind Technology Center (NWTC) as a part of this project. Safety and function testing is one of up to five tests that were performed on the turbines, including power performance, duration, noise, and power quality tests. Test results provide manufacturers with reports that can be used for small wind turbine certification. The test equipment includes an ARE 442 wind turbine mounted on a 100-ft free-standing lattice tower. The system was installed by the NWTC Site Operations group with guidance and assistance from Abundant Renewable Energy.

  3. 36 SEPTEMBER | 2012 WiNd TURbiNE CAPACiTY

    E-Print Network [OSTI]

    Kusiak, Andrew

    contributor to this growth. The wind turbine generated energy depends on the wind potential and the turbine, the application of DEA in wind energy is new. Assessment of turbine ca- pacity in presence of faults is performed in wind energy at the University of iowa. #12;windsystemsmag.com 37 period. Of two turbines operating

  4. Parametric design of floating wind turbines

    E-Print Network [OSTI]

    Tracy, Christopher (Christopher Henry)

    2007-01-01

    As the price of energy increases and wind turbine technology matures, it is evident that cost effective designs for floating wind turbines are needed. The next frontier for wind power is the ocean, yet development in near ...

  5. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    3.2.1 Description of Test Wind Turbine . . . . . .Figure 1.2: Components of a modern wind turbine . . . . . .D.3: D.4: Wind turbine parameters . . . . . . . . . . . .

  6. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    3.2.1 Description of Test Wind Turbine . . . . . .Figure 1.2: Components of a modern wind turbine . . . . . .Wind Turbine . . . . . . . . . . . . . . . . . . . . . . .

  7. Understanding Trends in Wind Turbine Prices Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2012-01-01

    specific focus on the cost of wind turbines deployed onshoremovements inflating the cost of wind turbines imported intothe USD-denominated cost of wind turbines imported into the

  8. 5th International Meeting Wind Turbine Noise

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 5th International Meeting on Wind Turbine Noise Denver 28 ­ 30 August 2013 Wind Turbine Noise Broadband noise generated aerodynamically is the dominant noise source for a modern wind turbine(Brooks et turbines . First, a wall pressure spectral model proposed recently by Rozenberg, Robert and Moreau

  9. Effect of Surface Roughness on Wind Turbine Performance 

    E-Print Network [OSTI]

    Ehrmann, Robert Schaefer

    2014-06-25

    Wind farm operators observe production deficits as machines age. Quantifying deterioration on individual components is difficult, but one potential explanation is accumulation of blade surface roughness. Historically, wind turbine airfoils were...

  10. Airfoils for wind turbine

    DOE Patents [OSTI]

    Tangler, James L. (Boulder, CO); Somers, Dan M. (State College, PA)

    2000-01-01

    Airfoils for the tip and mid-span regions of a wind turbine blade have upper surface and lower surface shapes and contours between a leading edge and a trailing edge that minimize roughness effects of the airfoil and provide maximum lift coefficients that are largely insensitive to roughness effects. The airfoil in one embodiment is shaped and contoured to have a thickness in a range of about fourteen to seventeen percent, a Reynolds number in a range of about 1,500,000 to 2,000,000, and a maximum lift coefficient in a range of about 1.4 to 1.5. In another embodiment, the airfoil is shaped and contoured to have a thickness in a range of about fourteen percent to sixteen percent, a Reynolds number in a range of about 1,500,000 to 3,000,000, and a maximum lift coefficient in a range of about 0.7 to 1.5. Another embodiment of the airfoil is shaped and contoured to have a Reynolds in a range of about 1,500,000 to 4,000,000, and a maximum lift coefficient in a range of about 1.0 to 1.5.

  11. MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES

    E-Print Network [OSTI]

    APPENDIX A MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES #12;A-1 APPENDIX A MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES 1.0 INTRODUCTION Differential composition of wind turbines at wind energy used is the number of fatalities per wind turbine per year (Anderson et al. 1999). This metric has

  12. A Fatigue Approach to Wind Turbine Control

    E-Print Network [OSTI]

    A Fatigue Approach to Wind Turbine Control Keld Hammerum Kongens Lyngby 2006 #12;Technical to the turbulent nature of wind, the structural components of a wind turbine are exposed to highly varying loads. Therefore, fatigue damage is a major consideration when designing wind turbines. The control scheme applied

  13. Sandia Wind Turbine Loads Database

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    The Sandia Wind Turbine Loads Database is divided into six files, each corresponding to approximately 16 years of simulation. The files are text files with data in columnar format. The 424MB zipped file containing six data files can be downloaded by the public. The files simulate 10-minute maximum loads for the NREL 5MW wind turbine. The details of the loads simulations can be found in the paper: “Decades of Wind Turbine Loads Simulations”, M. Barone, J. Paquette, B. Resor, and L. Manuel, AIAA2012-1288 (3.69MB PDF). Note that the site-average wind speed is 10 m/s (class I-B), not the 8.5 m/s reported in the paper.

  14. Energy 101: Wind Turbines - 2014 Update

    ScienceCinema (OSTI)

    None

    2014-06-05

    See how wind turbines generate clean electricity from the power of wind. The video highlights the basic principles at work in wind turbines, and illustrates how the various components work to capture and convert wind energy to electricity. This updated version also includes information on the Energy Department's efforts to advance offshore wind power. Offshore wind energy footage courtesy of Vestas.

  15. Energy 101: Wind Turbines - 2014 Update

    SciTech Connect (OSTI)

    2014-05-06

    See how wind turbines generate clean electricity from the power of wind. The video highlights the basic principles at work in wind turbines, and illustrates how the various components work to capture and convert wind energy to electricity. This updated version also includes information on the Energy Department's efforts to advance offshore wind power. Offshore wind energy footage courtesy of Vestas.

  16. Radar-cross-section reduction of wind turbines. part 1.

    SciTech Connect (OSTI)

    Brock, Billy C.; Loui, Hung; McDonald, Jacob J.; Paquette, Joshua A.; Calkins, David A.; Miller, William K.; Allen, Steven E.; Clem, Paul Gilbert; Patitz, Ward E.

    2012-03-05

    In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustments, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not technically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techniques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

  17. TOWARDS LIFE-CYCLE MANAGEMENT OF WIND TURBINES BASED ON STRUCTURAL HEALTH MONITORING

    E-Print Network [OSTI]

    Stanford University

    for power generation in 83 countries, 52 of which having increased their totally installed wind energy for manufacturers, owners, and operators. Unlike conventional power plants, wind turbines represent unmanned remote and maintenance of wind turbines and, eventually, to operate wind turbines beyond their original design life

  18. An introduction to the small wind turbine project

    SciTech Connect (OSTI)

    Forsyth, T.L.

    1997-07-01

    Small wind turbines are typically used for the remote or rural areas of the world including: a village in Chile; a cabin dweller in the U.S.; a farmer who wants to water his crop; or a utility company that wants to use distributed generation to help defer building new transmission lines and distribution facilities. Small wind turbines can be used for powering communities, businesses, homes, and miscellaneous equipment to support unattended operation. This paper covers the U.S. Department of Energy/National Renewable Energy Laboratory Small Wind Turbine project, its specifications, its applications, the subcontractors and their small wind turbines concepts. 4 refs., 4 figs.

  19. Sandia Energy - Innovative Offshore Vertical-Axis Wind Turbine...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Innovative Offshore Vertical-Axis Wind Turbine Rotors Home Stationary Power Energy Conversion Efficiency Wind Energy Offshore Wind Innovative Offshore Vertical-Axis Wind Turbine...

  20. Understanding Trends in Wind Turbine Prices Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2012-01-01

    include some offshore wind turbines. That said, the factoffshore wind still accounts for a relatively small portion of Vestas’ turbine

  1. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    aerodynamics and other operational loads for a turbine, both models were developed so that the wind turbinewind turbine in response to earthquake excitation. As suggested by results here, consideration of aerodynamics andwind and earthquake loading Load Demand Earthquake Aerodynamics Case (MN-m) Parked turbine

  2. Numerical Investigation of Aerodynamic Performance and Loads of a Novel Dual Rotor Wind Turbine

    E-Print Network [OSTI]

    Hu, Hui

    Numerical Investigation of Aerodynamic Performance and Loads of a Novel Dual Rotor Wind Turbine-rotor wind turbine (DRWT) proposed by Rosenberg et al.1 Assuming that the turbine operates in isolation. Comparisons are drawn with the corresponding analyses of a com- parable conventional single-rotor wind turbine

  3. Vertical axis wind turbine airfoil

    DOE Patents [OSTI]

    Krivcov, Vladimir; Krivospitski, Vladimir; Maksimov, Vasili; Halstead, Richard; Grahov, Jurij Vasiljevich

    2012-12-18

    A vertical axis wind turbine airfoil is described. The wind turbine airfoil can include a leading edge, a trailing edge, an upper curved surface, a lower curved surface, and a centerline running between the upper surface and the lower surface and from the leading edge to the trailing edge. The airfoil can be configured so that the distance between the centerline and the upper surface is the same as the distance between the centerline and the lower surface at all points along the length of the airfoil. A plurality of such airfoils can be included in a vertical axis wind turbine. These airfoils can be vertically disposed and can rotate about a vertical axis.

  4. Bats and offshore wind turbines studied in

    E-Print Network [OSTI]

    Bats and offshore wind turbines studied in southern Scandinavia report 5571 · july 2007 #12;Bats and offshore wind turbines studied in southern Scandinavia Ingemar Ahlén Lothar Bach Hans J. Baagøe Jan Ahlén Digital publication #12;VINDVAL Report 5571 - Bats and offshore wind turbines studied in southern

  5. Computational Analysis of Shrouded Wind Turbine Configurations

    E-Print Network [OSTI]

    Alonso, Juan J.

    Computational Analysis of Shrouded Wind Turbine Configurations Aniket C. Aranake Vinod K-dimensional simulations of shrouded wind turbines are performed for selected shroud geometries. The results are compared at the highest wind speed for which the flow over the bare turbine blade stays attached. Flow fields are examined

  6. Prototype bucket foundation for wind turbines

    E-Print Network [OSTI]

    Prototype bucket foundation for wind turbines -natural frequency estimation Lars Bo Ibsen Morten bucket foundation for wind turbines -natural frequency estimation by Lars Bo Ibsen Morten Liingaard foundation for wind turbines--natural frequency estimation" is divided into four numbered sections

  7. Wind Turbine Drivetrain Condition Monitoring - An Overview (Presentation)

    SciTech Connect (OSTI)

    Sheng, S.; Yang, W.

    2013-07-01

    High operation and maintenance costs still hamper the development of the wind industry despite its quick growth worldwide. To reduce unscheduled downtime and avoid catastrophic failures of wind turbines and their components have been and will be crucial to further raise the competitiveness of wind power. Condition monitoring is one of the key tools for achieving such a goal. To enhance the research and development of advanced condition monitoring techniques dedicated to wind turbines, we present an overview of wind turbine condition monitoring, discuss current practices, point out existing challenges, and suggest possible solutions.

  8. Built Environment Wind Turbine Roadmap

    SciTech Connect (OSTI)

    Smith, J.; Forsyth, T.; Sinclair, K.; Oteri, F.

    2012-11-01

    The market currently encourages BWT deployment before the technology is ready for full-scale commercialization. To address this issue, industry stakeholders convened a Rooftop and Built-Environment Wind Turbine Workshop on August 11 - 12, 2010, at the National Wind Technology Center, located at the U.S. Department of Energy’s National Renewable Energy Laboratory in Boulder, Colorado. This report summarizes the workshop.

  9. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    studied were vertical axis wind turbines, which are nottesting of vertical axis wind turbines (VAWT). For example,vertical axis turbines (VAWTs). Gradually, as the industry matured, most design concepts standardized on horizontal axis wind turbines (

  10. Analysis of the effects of integrating wind turbines into a conventional utility: a case study. Final report

    SciTech Connect (OSTI)

    Goldenblatt, M.K.; Wegley, H.L.; Miller, A.H.

    1982-08-01

    The impact on a utility incorporating wind turbine generation due to wind speed sampling frequency, wind turbine performance model, and wind speed forecasting accuracy is examined. The utility analyzed in the study was the Los Angeles Department of Water and Power and the wind turbine assumed was the MOD-2. The sensitivity of the economic value of wind turbine generation to wind speed sampling frequency and wind turbine modeling technique is examined as well as the impact of wind forecasting accuracy on utility operation and production costs. Wind speed data from San Gorgonio Pass, California during 1979 are used to estimate wind turbine performance using four different simulation methods. (LEW)

  11. Analysis of the effects of integrating wind turbines into a conventional utility: a case study. Revised final report

    SciTech Connect (OSTI)

    Goldenblatt, M.K.; Wegley, H.L.; Miller, A.H.

    1983-03-01

    The impact on a utility incorporating wind turbine generation due to wind speed sampling frequency, wind turbine performance model, and wind speed forecasting accuracy is examined. The utility analyzed in this study was the Los Angeles Department of Water and Power, and the wind turbine assumed was the MOD-2. The sensitivity of the economic value of wind turbine generation to wind speed sampling frequency and wind turbine modeling technique is examined as well as the impact of wind forecasting accuracy on utility operation and production costs. Wind speed data from San Gorgonio Pass, California during 1979 are used to estimate wind turbine performance using four different simulation methods. (LEW)

  12. Wind Turbine Generator System Duration Test Report for the Gaia-Wind 11 kW Wind Turbine

    SciTech Connect (OSTI)

    Huskey, A.; Bowen, A.; Jager, D.

    2010-09-01

    This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, five turbines are being tested at the National Renewable Energy Laboratory's (NRELs) National Wind Technology Center (NWTC) as a part of this project. Duration testing is one of up to five tests that may be performed on the turbines, including power performance, safety and function, noise, and power quality tests. The results of the testing will provide the manufacturers with reports that may be used for small wind turbine certification. The test equipment includes a Gaia-Wind 11 kW wind turbine mounted on an 18 m monopole tower. Gaia-Wind Ltd. manufactured the turbine in Denmark, although the company is based in Scotland. The system was installed by the NWTC Site Operations group with guidance and assistance from Gaia-Wind.

  13. Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting

    E-Print Network [OSTI]

    Capps, Scott B; Zender, Charles S

    2010-01-01

    has more than 30 offshore wind farms in operation oraway to be unheard, offshore wind farms can contain larger,turbines considered, offshore wind farms consisting of the

  14. Wind Turbine Tribology Seminar - A Recap

    SciTech Connect (OSTI)

    Errichello, R.; Sheng, S.; Keller, J.; Greco, A.

    2012-02-01

    Tribology is the science and engineering of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication, and wear. It is an important phenomenon that not only impacts the design and operation of wind turbine gearboxes, but also their subsequent maintenance requirements and overall reliability. With the major growth and increasing dependency on renewable energy, mechanical reliability is an extremely important issue. The Wind Turbine Tribology Seminar was convened to explore the state-of-the-art in wind turbine tribology and lubricant technologies, raise industry awareness of a very complex topic, present the science behind each technology, and identify possible R&D areas. To understand the background of work that had already been accomplished, and to consolidate some level of collective understanding of tribology by acknowledged experts, the National Renewable Energy Laboratory (NREL), Argonne National Laboratory (ANL), and the U.S. Department of Energy (DOE) hosted a wind turbine tribology seminar. It was held at the Renaissance Boulder Flatiron Hotel in Broomfield, Colorado on November 15-17, 2011. This report is a summary of the content and conclusions. The presentations given at the meeting can be downloaded. Interested readers who were not at the meeting may wish to consult the detailed publications listed in the bibliography section, obtain the cited articles in the public domain, or contact the authors directly.

  15. Offshore Wind Turbines: Some Technical Challenges

    E-Print Network [OSTI]

    Houlsby, Guy T.

    1 Offshore Wind Turbines: Some Technical Challenges Prof. Guy Houlsby FREng Oxford University House engineers concerned with installation of offshore wind turbines. The author is Professor of Civil University Civil Engineering Offshore wind power · Scale of offshore wind power developments · Engineering

  16. Wind turbine reliability : a database and analysis approach.

    SciTech Connect (OSTI)

    Linsday, James; Briand, Daniel; Hill, Roger Ray; Stinebaugh, Jennifer A.; Benjamin, Allan S.

    2008-02-01

    The US wind Industry has experienced remarkable growth since the turn of the century. At the same time, the physical size and electrical generation capabilities of wind turbines has also experienced remarkable growth. As the market continues to expand, and as wind generation continues to gain a significant share of the generation portfolio, the reliability of wind turbine technology becomes increasingly important. This report addresses how operations and maintenance costs are related to unreliability - that is the failures experienced by systems and components. Reliability tools are demonstrated, data needed to understand and catalog failure events is described, and practical wind turbine reliability models are illustrated, including preliminary results. This report also presents a continuing process of how to proceed with controlling industry requirements, needs, and expectations related to Reliability, Availability, Maintainability, and Safety. A simply stated goal of this process is to better understand and to improve the operable reliability of wind turbine installations.

  17. Wind Turbine Towers Establish New Height Standards and Reduce...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Turbine Towers Establish New Height Standards and Reduce Cost of Wind Energy Wind Turbine Towers Establish New Height Standards and Reduce Cost of Wind Energy Case study that...

  18. Advanced controls for floating wind turbines

    E-Print Network [OSTI]

    Casanovas, Carlos (Casanovas Bermejo)

    2014-01-01

    Floating Offshore Wind Turbines (FOWT) is a technology that stands to spearhead the rapid growth of the offshore wind energy sector and allow the exploration of vast high quality wind resources over coastal and offshore ...

  19. AWEA Wind Project Operations and Maintenance and Safety Seminar

    Office of Energy Efficiency and Renewable Energy (EERE)

    The AWEA Wind Project O&M and Safety Seminar is designed for owners, operators, turbine manufactures, material suppliers, wind technicians, managers, supervisors, engineers, and occupational...

  20. Understanding Trends in Wind Turbine Prices Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2012-01-01

    Dissecting Wind Turbine Costs. ” WindStats Newsletter, vol.A. Laxson. 2006. Wind Turbine Design Cost and Scaling Model.they can impact wind turbine costs but fall mostly outside

  1. Understanding Trends in Wind Turbine Prices Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2012-01-01

    impacts on wind turbine and wind energy pricing. ReferencesProduction from a V112 Turbine Wind Plant. Prepared forBloomberg NEF”). 2011c. Wind Turbine Price Index, Issue V.

  2. Method and apparatus for wind turbine braking

    DOE Patents [OSTI]

    Barbu, Corneliu (Laguna Hills, CA); Teichmann, Ralph (Nishkayuna, NY); Avagliano, Aaron (Houston, TX); Kammer, Leonardo Cesar (Niskayuna, NY); Pierce, Kirk Gee (Simpsonville, SC); Pesetsky, David Samuel (Greenville, SC); Gauchel, Peter (Muenster, DE)

    2009-02-10

    A method for braking a wind turbine including at least one rotor blade coupled to a rotor. The method includes selectively controlling an angle of pitch of the at least one rotor blade with respect to a wind direction based on a design parameter of a component of the wind turbine to facilitate reducing a force induced into the wind turbine component as a result of braking.

  3. MODAL PARAMETER ESTIMATION FOR OPERATIONAL WIND TURBINES Emilio Di Lorenzo1, 2

    E-Print Network [OSTI]

    Boyer, Edmond

    , Bart Peeters1 , Francesco Marulo2 1 LMS, A Siemens Business, RTD Test Division, Interleuvenlaan 68-varying systems excited by loads due to the wind and to the interaction between blades, tower and drivetrain. The Multi-Blade Coordinate transformation (MBC) allows describing the dynamic interaction between

  4. Fast Wind Turbine Design via Geometric Programming

    E-Print Network [OSTI]

    Abbeel, Pieter

    Fast Wind Turbine Design via Geometric Programming Warren Hoburg and Pieter Abbeel UC Berkeley turbine aerodynamics have an underlying convex mathematical structure that these new methods can exploit the application of GP to large wind turbine design problems a promising approach. Nomenclature (·)a, (·)t axial

  5. Wind Turbine Blockset in Matlab/Simulink

    E-Print Network [OSTI]

    Wind Turbine Blockset in Matlab/Simulink General Overview and Description of the Models Florin Iov, Anca Daniela Hansen, Poul Sørensen, Frede Blaabjerg Aalborg University March 2004 #12;22 Wind Turbine turbine applications. This toolbox has been developed during the research project "Simulation Platform

  6. DOE/NREL Advanced Wind Turbine Development Program

    SciTech Connect (OSTI)

    Butterfield, C.P.; Smith, B.; Laxson, A.; Thresher, B. [National Renewable Energy Lab., Golden, CO (United States)] [National Renewable Energy Lab., Golden, CO (United States); Goldman, P. [USDOE Assistant Secretary for Conservation and Renewable Energy, Washington, DC (United States). Wind/Hydro/Ocean Technologies Div.] [USDOE Assistant Secretary for Conservation and Renewable Energy, Washington, DC (United States). Wind/Hydro/Ocean Technologies Div.

    1993-05-01

    The development of technologically advanced, high-efficiency wind turbines continues to be a high-priority activity of the US wind industry. The National Renewable Energy Laboratory (formerly the Solar Energy Research Institute), sponsored by the US Department of Energy (DOE), has initiated the Advanced Wind Turbine Program to assist the wind industry in the development of a new class of advanced wind turbines. The initial phase of the program focused on developing conceptual designs for near-term and advanced turbines. The goal of the second phase of this program is to use the experience gained over the last decade of turbine design and operation combined with the latest existing design tools to develop a turbine that will produce energy at $0.05 per kilowatt-hour (kWh) in a 5.8-m/s (13-mph) wind site. Three contracts have been awarded, and two more are under negotiation in the second phase. The third phase of the program will use new innovations and state-of-the-art wind turbine design technology to produce a turbine that will generate energy at $0.04/kWh in a 5.8-m/s wind site. Details of the third phase will be announced in early 1993.

  7. Wind Turbine Manufacturing Process Monitoring

    SciTech Connect (OSTI)

    Waseem Faidi; Chris Nafis; Shatil Sinha; Chandra Yerramalli; Anthony Waas; Suresh Advani; John Gangloff; Pavel Simacek

    2012-04-26

    To develop a practical inline inspection that could be used in combination with automated composite material placement equipment to economically manufacture high performance and reliable carbon composite wind turbine blade spar caps. The approach technical feasibility and cost benefit will be assessed to provide a solid basis for further development and implementation in the wind turbine industry. The program is focused on the following technology development: (1) Develop in-line monitoring methods, using optical metrology and ultrasound inspection, and perform a demonstration in the lab. This includes development of the approach and performing appropriate demonstration in the lab; (2) Develop methods to predict composite strength reduction due to defects; and (3) Develop process models to predict defects from leading indicators found in the uncured composites.

  8. Turbine Inflow Characterization at the National Wind Technology Center: Preprint

    SciTech Connect (OSTI)

    Clifton, A.; Schreck, S.; Scott, G.; Kelley, N.; Lundquist, J.

    2012-01-01

    Utility-scale wind turbines operate in dynamic flows that can vary significantly over timescales from less than a second to several years. To better understand the inflow to utility-scale turbines, two inflow towers were installed and commissioned at the National Renewable Energy Laboratory's (NREL) National Wind Technology Center near Boulder, Colorado, in 2011. These towers are 135 m tall and instrumented with a combination of sonic anemometers, cup anemometers, wind vanes, and temperature measurements to characterize the inflow wind speed and direction, turbulence, stability and thermal stratification to two utility-scale turbines. Herein, we present variations in mean and turbulent wind parameters with height, atmospheric stability, and as a function of wind direction that could be important for turbine operation as well as persistence of turbine wakes. Wind speed, turbulence intensity, and dissipation are all factors that affect turbine performance. Our results shown that these all vary with height across the rotor disk, demonstrating the importance of measuring atmospheric conditions that influence wind turbine performance at multiple heights in the rotor disk, rather than relying on extrapolation from lower levels.

  9. Wind Turbine Generator System Acoustic Noise Test Report for the Gaia Wind 11-kW Wind Turbine

    SciTech Connect (OSTI)

    Huskey, A.

    2011-11-01

    This report details the acoustic noise test conducted on the Gaia-Wind 11-kW wind turbine at the National Wind Technology Center. The test turbine is a two- bladed, downwind wind turbine with a rated power of 11 kW. The test turbine was tested in accordance with the International Electrotechnical Commission standard, IEC 61400-11 Ed 2.1 2006-11 Wind Turbine Generator Systems -- Part 11 Acoustic Noise Measurement Techniques.

  10. Ris-R-1532(EN) Operation and control of large wind

    E-Print Network [OSTI]

    Risø-R-1532(EN) Operation and control of large wind turbines and wind farms - Final report Poul, Henrik Madsen and Martin H. Donovan Title: Operation and control of large wind turbines and wind farms "Operation and control of large wind turbines and wind farms". The objective of the project has been

  11. Midwest Consortium for Wind Turbine Reliability and Optimization

    SciTech Connect (OSTI)

    Scott R. Dana; Douglas E. Adams; Noah J. Myrent

    2012-05-11

    This report provides an overview of the efforts aimed to establish a student focused laboratory apparatus that will enhance Purdue's ability to recruit and train students in topics related to the dynamics, operations and economics of wind turbines. The project also aims to facilitate outreach to students at Purdue and in grades K-12 in the State of Indiana by sharing wind turbine operational data. For this project, a portable wind turbine test apparatus was developed and fabricated utilizing an AirX 400W wind energy converter. This turbine and test apparatus was outfitted with an array of sensors used to monitor wind speed, turbine rotor speed, power output and the tower structural dynamics. A major portion of this project included the development of a data logging program used to display real-time sensor data and the recording and creation of output files for data post-processing. The apparatus was tested in an open field to subject the turbine to typical operating conditions and the data acquisition system was adjusted to obtain desired functionality to facilitate use for student projects in existing courses offered at Purdue University and Indiana University. Data collected using the data logging program is analyzed and presented to demonstrate the usefulness of the test apparatus related to wind turbine dynamics and operations.

  12. Dynamic response analysis of a 900 kW wind turbine subject to ground excitation

    E-Print Network [OSTI]

    Caudillo, Adrian Felix

    2012-01-01

    powered by wind energy, wind turbines themselves stillWind Energy and Earthquake Activity Wind Turbines areTested wind turbine provided courtesy of Oak Creek Energy

  13. Maximizing the Performance of Wind Turbines with Nonlinear Aeroservoelastic Power Flow Control

    E-Print Network [OSTI]

    1 Maximizing the Performance of Wind Turbines with Nonlinear Aeroservoelastic Power Flow Control by a wind turbine by operating at the edge of dynamic stall. This paper applies a novel nonlinear power flow of the first torsional mode of a nominal 5 MW rated power wind turbine blade. This model is analyzed using

  14. A Cyberinfrastructure for Integrated Monitoring and Life-Cycle Management of Wind Turbines

    E-Print Network [OSTI]

    Stanford University

    A Cyberinfrastructure for Integrated Monitoring and Life-Cycle Management of Wind Turbines Kay Abstract. Integrating structural health monitoring into life-cycle management strategies for wind turbines data) can effectively be used to capture the operational and structural behavior of wind turbines

  15. High-Order Sliding Mode Control of a DFIG-Based Wind Turbine

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    High-Order Sliding Mode Control of a DFIG-Based Wind Turbine for Power Maximization and Grid Fault tolerance of a Doubly-Fed Induction Generator (DFIG)-based Wind Turbine (WT). These variable speed systems have several advantages over the traditional wind turbine operating methods, such as the reduction

  16. A Comparative Study of Time-Frequency Representations for Fault Detection in Wind Turbine

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Comparative Study of Time-Frequency Representations for Fault Detection in Wind Turbine El of wind energy, minimization and prediction of maintenance operations in wind turbine is of key importance. In variable speed turbine generator, advanced signal processing tools are required to detect and diagnose

  17. DATA NORMALIZATION FOR FOUNDATION SHM OF AN OFFSHORE WIND TURBINE : A REAL-LIFE CASE STUDY

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    DATA NORMALIZATION FOR FOUNDATION SHM OF AN OFFSHORE WIND TURBINE : A REAL-LIFE CASE STUDY Wout the first results in the development of a SHM approach for the foun- dations of an offshore wind turbine the performance of the presented approach. KEYWORDS : Foundation Monitoring, Offshore Wind Turbine, Operational

  18. Small Wind Research Turbine: Final Report

    SciTech Connect (OSTI)

    Corbus, D.; Meadors, M.

    2005-10-01

    The Small Wind Research Turbine (SWRT) project was initiated to provide reliable test data for model validation of furling wind turbines and to help understand small wind turbine loads. This report will familiarize the user with the scope of the SWRT test and support the use of these data. In addition to describing all the testing details and results, the report presents an analysis of the test data and compares the SWRT test data to simulation results from the FAST aeroelastic simulation model.

  19. Offshore Wind Turbines Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine Addendum 2

    SciTech Connect (OSTI)

    Aker, Pamela M.; Jones, Anthony M.; Copping, Andrea E.

    2011-03-01

    Additional modeling for offshore wind turbines, for proposed floating wind platforms to be deployed by University of Maine/DeepCwind.

  20. Advanced horizontal axis wind turbines in windfarms

    SciTech Connect (OSTI)

    None, None

    2009-01-18

    The wind turbine section of the Renewable Energy Technology Characterizations describes the technical and economic status of this emerging renewable energy option for electricity supply.

  1. Wind Turbine Generator System Safety and Function Test Report for the Entegrity EW50 Wind Turbine

    SciTech Connect (OSTI)

    Smith, J.; Huskey, A.; Jager, D.; Hur, J.

    2012-11-01

    This report summarizes the results of a safety and function test that NREL conducted on the Entegrity EW50 wind turbine. This test was conducted in accordance with the International Electrotechnical Commissions' (IEC) standard, Wind Turbine Generator System Part 2: Design requirements for small wind turbines, IEC 61400-2 Ed.2.0, 2006-03.

  2. Wind Turbine Generator System Safety and Function Test Report for the Ventera VT10 Wind Turbine

    SciTech Connect (OSTI)

    Smith, J.; Huskey, A.; Jager, D.; Hur, J.

    2012-11-01

    This report summarizes the results of a safety and function test that NREL conducted on the Ventera VT10 wind turbine. This test was conducted in accordance with the International Electrotechnical Commissions' (IEC) standard, Wind Turbine Generator System Part 2: Design requirements for small wind turbines, IEC 61400-2 Ed.2.0, 2006-03.

  3. Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting

    E-Print Network [OSTI]

    Capps, Scott B; Zender, Charles S

    2010-01-01

    envisioned floating offshore wind turbines. Finally, globalfloating turbine depths. [ 32 ] The combined impact of wind turbine

  4. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    5-MW Reference Wind Turbine for Offshore System Development.for Floating Offshore Wind Turbines. Tech. no. NREL/CP-500-a Spar-type Floating Offshore Wind Turbine. Thesis. TU Delft

  5. Aero-Structural Design Investigations for Biplane Wind Turbine Blades

    E-Print Network [OSTI]

    Roth-Johnson, Perry

    2014-01-01

    14] 4C Offshore, “Offshore Wind Turbine: S7.0-171, Sam- sungblade for a 7-MW offshore wind turbine [8], and blades arefor a 6-megawatt offshore wind turbine [79, 80]. Blades are

  6. Aero-Structural Design Investigations for Biplane Wind Turbine Blades

    E-Print Network [OSTI]

    Roth-Johnson, Perry

    2014-01-01

    44] M. Hansen, Aerodynamics of wind turbines. Golden, CO:of the art in wind turbine aerodynamics and aeroelasticity,”subsonic regime of wind turbine aerodynamics in the inboard

  7. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    1985. 23. Hau, E. Wind Turbines: Fundamentals, Technologies,for Floating Offshore Wind Turbines. Tech. no. NREL/CP-500-Full-scale Floating Wind Turbine." Statoil, 14 Oct. 2009.

  8. Understanding Trends in Wind Turbine Prices Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2012-01-01

    Bloomberg NEF”). 2011c. Wind Turbine Price Index, Issue V.Hand, A. Laxson. 2006. Wind Turbine Design Cost and Scalingof a Multi-MegaWatt Wind Turbine. ” Renewable Energy, vol.

  9. Impacts of Wind Turbine Proximity on Property Values in Massachusetts

    E-Print Network [OSTI]

    Atkinson-Palombo, Carol

    2014-01-01

    of Techniques for Reduc- tion of Wind Turbine Blade Trailingon Loudness and Annoyance of Wind Turbine Noise. Acta Acus-9(2): 117-144. Impacts of Wind Turbine Proximity on Property

  10. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    s First Full-scale Floating Wind Turbine." Statoil, 14 Oct.Modeling of a Floating Wind Turbine." International Journalof an Offshore Floating Wind Turbine. Tech. no. NREL/TP-500-

  11. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    and Scope Wind energy is growing and turbines are regularlyStudy of Wind Turbines for Renewable Energy. ” NSF CMMIkW wind turbine at Oak Creek Energy Systems . . . . . . .

  12. Washington University Can the Sound Generated by Modern Wind Turbines

    E-Print Network [OSTI]

    Salt, Alec N.

    Washington University Can the Sound Generated by Modern Wind Turbines Affect the Health of Those turbines haveWind turbines have been getting biggerbeen getting bigger and bigger....and bigger.... Lars Needs Wind turbines are "green" and areWind turbines are "green" and are contributing to our energy

  13. Mixer-Ejector Wind Turbine: Breakthrough High Efficiency Shrouded Wind Turbine

    SciTech Connect (OSTI)

    2010-02-22

    Broad Funding Opportunity Announcement Project: FloDesign Wind Turbine’s innovative wind turbine, inspired by the design of jet engines, could deliver 300% more power than existing wind turbines of the same rotor diameter by extracting more energy over a larger area. FloDesign Wind Turbine’s unique shrouded design expands the wind capture area, and the mixing vortex downstream allows more energy to flow through the rotor without stalling the turbine. The unique rotor and shrouded design also provide significant opportunity for mass production and simplified assembly, enabling mid-scale turbines (approximately 100 kW) to produce power at a cost that is comparable to larger-scale conventional turbines.

  14. Wind turbine | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EAand Dalton Jump to: navigation, search Name:Wind turbine Jump to:

  15. User's manual for the vertical axis wind turbine performance...

    Office of Scientific and Technical Information (OSTI)

    User's manual for the vertical axis wind turbine performance computer code darter Citation Details In-Document Search Title: User's manual for the vertical axis wind turbine...

  16. Use of SCADA Data for Failure Detection in Wind Turbines

    SciTech Connect (OSTI)

    Kim, K.; Parthasarathy, G.; Uluyol, O.; Foslien, W.; Sheng, S.; Fleming, P.

    2011-10-01

    This paper discusses the use of existing wind turbine SCADA data for development of fault detection and diagnostic techniques for wind turbines.

  17. Argonne Researchers Shine "Light" on Origins of Wind Turbine...

    Office of Environmental Management (EM)

    Researchers Shine "Light" on Origins of Wind Turbine Bearing Failures Argonne Researchers Shine "Light" on Origins of Wind Turbine Bearing Failures September 12, 2014 - 11:34am...

  18. Upcoming Funding Opportunity to Develop Larger Wind Turbine Blades...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Upcoming Funding Opportunity to Develop Larger Wind Turbine Blades Upcoming Funding Opportunity to Develop Larger Wind Turbine Blades February 20, 2015 - 4:55pm Addthis On February...

  19. Advanced Control Design and Testing for Wind Turbines at the...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Control Design and Testing for Wind Turbines at the National Renewable Energy Laboratory: Preprint Advanced Control Design and Testing for Wind Turbines at the National Renewable...

  20. Hydrogen Storage in Wind Turbine Towers: Cost Analysis and Conceptual...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    in Wind Turbine Towers: Cost Analysis and Conceptual Design Hydrogen Storage in Wind Turbine Towers: Cost Analysis and Conceptual Design Preprint 34851.pdf More Documents &...

  1. An Exploration of Wind Energy & Wind Turbines | Department of...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    blade shape, height of turbine, etc Student worksheets are included to facilitate the design and analysis process. Learning Goals: Below are the learning targets for the wind...

  2. An exploration of wind energy and wind turbines

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    that effect wind turbine design. Explain the goals of the following lab experiments. Review what practices make for good experimental design and the need to control...

  3. 7,511,624 Wind Energy Overview: Device for monitoring the balance and integrity of wind turbine blades either in

    E-Print Network [OSTI]

    Maxwell, Bruce D.

    turbine blades either in service or as a quality control step in the manufacturing process Researchers oscillations (including imbalances and tracking variations) in wind turbine blades. This technology was tested covering the RPM rate of any wind turbine blade. This invention directly targets the operational monitoring

  4. Advanced Wind Turbine Drivetrain Concepts. Workshop Report

    SciTech Connect (OSTI)

    none,

    2010-12-01

    This report presents key findings from the Department of Energy’s Advanced Drivetrain Workshop, held on June 29-30, 2010, to assess different advanced drivetrain technologies, their relative potential to improve the state-of-the-art in wind turbine drivetrains, and the scope of research and development needed for their commercialization in wind turbine applications.

  5. Bats and offshore wind turbines studied in southern Scandinavia

    E-Print Network [OSTI]

    Bats and offshore wind turbines studied in southern Scandinavia 2005 - 2006 Bats & Wind Energy Pettersson Presented by Ingemar Ahlén #12;Bats and offshore wind turbines studied in southern Scandinavia straight towards planned offshore wind farms Red dots = Wind turbines Black dots = Planned turbines #12

  6. Lightning protection system for a wind turbine

    DOE Patents [OSTI]

    Costin, Daniel P. (Chelsea, VT); Petter, Jeffrey K. (Williston, VT)

    2008-05-27

    In a wind turbine (104, 500, 704) having a plurality of blades (132, 404, 516, 744) and a blade rotor hub (120, 712), a lightning protection system (100, 504, 700) for conducting lightning strikes to any one of the blades and the region surrounding the blade hub along a path around the blade hub and critical components of the wind turbine, such as the generator (112, 716), gearbox (708) and main turbine bearings (176, 724).

  7. Wind Turbines Electrical and Mechanical Engineering

    E-Print Network [OSTI]

    Provancher, William

    wind power. Encourage students to discuss the pros and cons of wind design. Students can find the wind? Time Required (Itemized) · Design introduction ­ 20 minutes · Student construction time o Option is created through conservation of energy! Designing a wind turbine takes a lot of ingenuity. The designer

  8. Responses of floating wind turbines to wind and wave excitation

    E-Print Network [OSTI]

    Lee, Kwang Hyun

    2005-01-01

    The use of wind power has recently emerged as a promising alternative to conventional electricity generation. However, space requirements and public pressure to place unsightly wind turbines out of visual range make it ...

  9. Wind Turbine Towers Establish New Height Standards and Reduce...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Wind Turbine Towers Establish New Height Standards and Reduce Cost of Wind Energy Wind Turbine Towers Establish New Height Standards and Reduce Cost of Wind Energy Case study that...

  10. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    Why offshore wind energy? Offshore wind turbines have theturbine will also uncover potential problems that exist with offshore wind energy.wind is a valuable source of renewable energy, as it is typically strong and steady. Turbines

  11. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    and the issues. ” Wind Energy, 7(4), 373–392. Somerville, P.wind turbine extreme loads. ” Wind Energy, 11(6), GL (2003).turbines. ” European Wind Energy Conference and Exhibition,

  12. 1Design limits and solutions for very large wind turbines Design limits and solutions for very large wind turbines

    E-Print Network [OSTI]

    Leu, Tzong-Shyng "Jeremy"

    #12;#12;1Design limits and solutions for very large wind turbines UpWind Design limits and solutions for very large wind turbines A 20 MW turbine is feasible March 2011 Supported by: #12;March 20112 Photo:Nordex #12;3Design limits and solutions for very large wind turbines Contents 1. UpWind: Summary

  13. Meteorological aspects of siting large wind turbines

    SciTech Connect (OSTI)

    Hiester, T.R.; Pennell, W.T.

    1981-01-01

    This report, which focuses on the meteorological aspects of siting large wind turbines (turbines with a rated output exceeding 100 kW), has four main goals. The first is to outline the elements of a siting strategy that will identify the most favorable wind energy sites in a region and that will provide sufficient wind data to make responsible economic evaluations of the site wind resource possible. The second is to critique and summarize siting techniques that were studied in the Department of Energy (DOE) Wind Energy Program. The third goal is to educate utility technical personnel, engineering consultants, and meteorological consultants (who may have not yet undertaken wind energy consulting) on meteorological phenomena relevant to wind turbine siting in order to enhance dialogues between these groups. The fourth goal is to minimize the chances of failure of early siting programs due to insufficient understanding of wind behavior.

  14. INFLOW AND THE FATIGUE OF THE LIST WIND TURBINE*

    E-Print Network [OSTI]

    1 INFLOW AND THE FATIGUE OF THE LIST WIND TURBINE* Herbert J. Sutherland Wind Energy Technology response data to characterize the spectrum of loads on wind turbines. A heavily instrumented Micon 65/13M turbine with SERI 8m blades is being used as the primary test turbine for this test. This turbine

  15. Influence of refraction on wind turbine noise

    E-Print Network [OSTI]

    Makarewicz, Rufin

    2013-01-01

    A semi-empirical method is applied to calculate the time-average sound level of wind turbine noise generation and propagation. Both are affected by wind shear refraction. Under upwind conditions the partially ensonified zone separates the fully ensonified zone (close to the turbine) and the shadow zone (far away from the turbine). Refraction is described in terms of the wind speed linear profile fitted to the power law profile. The rotating blades are treated as a two-dimensional circular source in the vertical plane. Inside the partially ensonified zone the effective A-weighted sound power decreases to zero when the receiver moves from the turbine toward the shadow zone. The presented results would be useful in practical applications to give a quick estimate of the effect of refraction on wind turbine noise.

  16. 756 IEEE TRANSACTIONS ON SUSTAINABLE ENERGY, VOL. 4, NO. 3, JULY 2013 Minimization of Wind Farm Operational

    E-Print Network [OSTI]

    Kusiak, Andrew

    turbines installed at a wind farm. Wind turbine index. Grid demand at time . Power generated by wind turbine at time . Expected power generated by wind turbine at time window . Average wind speed at time price at time . Power shortage (demand minus generated wind power) at time . Levelized unit operations

  17. Advanced Wind Turbine Controls Reduce Loads (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-03-01

    NREL's National Wind Technology Center provides the world's only dedicated turbine controls testing platforms.

  18. Wind Turbines and Health A Rapid Review of the Evidence

    E-Print Network [OSTI]

    Firestone, Jeremy

    1 Wind Turbines and Health A Rapid Review of the Evidence July 2010 #12;2 Wind Turbines and Health of the evidence from current literature on the issue of wind turbines and potential impacts on human health regarding wind turbines and their potential effect on human health. It is important to note that these views

  19. Loads Analysis of Several Offshore Floating Wind Turbine Concepts

    SciTech Connect (OSTI)

    Robertson, A. N.; Jonkman, J. M.

    2011-10-01

    This paper presents a comprehensive dynamic-response analysis of six offshore floating wind turbine concepts.

  20. Doctoral Position Aeroelastic Analysis of Large Wind Turbines

    E-Print Network [OSTI]

    Doctoral Position Aeroelastic Analysis of Large Wind Turbines In the research project "Aeroelastic Analysis Horizontal-axis wind turbine and numerical model. of Large Wind Turbines" funded by the Ger- man involving the in-house Finite-Element CFD code XNS to enable the simulation of wind turbines. The ability

  1. A low order model for vertical axis wind turbines

    E-Print Network [OSTI]

    Drela, Mark

    A new computational model for initial sizing and performance prediction of vertical axis wind turbines

  2. Active load control techniques for wind turbines.

    SciTech Connect (OSTI)

    van Dam, C.P.; Berg, Dale E.; Johnson, Scott J.

    2008-07-01

    This report provides an overview on the current state of wind turbine control and introduces a number of active techniques that could be potentially used for control of wind turbine blades. The focus is on research regarding active flow control (AFC) as it applies to wind turbine performance and loads. The techniques and concepts described here are often described as 'smart structures' or 'smart rotor control'. This field is rapidly growing and there are numerous concepts currently being investigated around the world; some concepts already are focused on the wind energy industry and others are intended for use in other fields, but have the potential for wind turbine control. An AFC system can be broken into three categories: controls and sensors, actuators and devices, and the flow phenomena. This report focuses on the research involved with the actuators and devices and the generated flow phenomena caused by each device.

  3. Midsize Wind Turbines for the U.S. Community Wind Market | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Midsize Wind Turbines for the U.S. Community Wind Market Midsize Wind Turbines for the U.S. Community Wind Market A presentation on the midsize wind markets, including town-owned,...

  4. 36 AUGUST | 2011 EnhancEd TurbinE

    E-Print Network [OSTI]

    Kusiak, Andrew

    36 AUGUST | 2011 EnhancEd TurbinE PErformancE moniToring comPonEnTs of wind TurbinEs are affected by asymmetric loads, variable wind speeds, and se- vere weather conditions which cause wind turbines to change their states. A typical wind turbine under- goes various states during its daily operations. The wind turbine

  5. Automatic Control of Freeboard and Turbine Operation

    E-Print Network [OSTI]

    Automatic Control of Freeboard and Turbine Operation ­ Wave Dragon, Nissum Bredning Project: Sea of Freeboard and Turbine Operation Wave Dragon, Nissum Bredning by Jens Peter Kofoed & Peter Frigaard, Aalborg.........................................................................................................................10 TURBINE PERFORMANCE DATA

  6. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    Enabling New Markets for Offshore Wind Energy." Proc. ofand Laura Parsons. Offshore Wind Energy. Washingto, DC:Challenges for Floating Offshore Wind Turbines. Tech. no.

  7. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    Enabling New Markets for Offshore Wind Energy." Proc. ofMary, and Laura Parsons. Offshore Wind Energy. Washingto,Challenges for Floating Offshore Wind Turbines. Tech. no.

  8. Advanced wind turbine design studies: Advanced conceptual study. Final report

    SciTech Connect (OSTI)

    Hughes, P.; Sherwin, R. [Atlantic Orient Corp., Norwich, VT (United States)] [Atlantic Orient Corp., Norwich, VT (United States)

    1994-08-01

    In conjunction with the US Department of Energy and the National Renewable Energy Laboratory`s Advanced Wind Turbine Program, the Atlantic Orient Corporation developed preliminary designs for the next generation of wind turbines. These 50 kW and 350 kW turbines are based upon the concept of simplicity. By adhering to a design philosophy that emphasizes simplicity, we project that these turbines will produce energy at extremely competitive rates which will unlock the potential of wind energy domestically and internationally. The program consisted of three distinct phases. First, we evaluated the operational history of the Enertech 44 series wind turbines. As a result of this evaluation, we developed, in the second phase, a preliminary design for a new 50 kW turbine for the near-term market. In the third phase, we took a clean-sheet-of-paper approach to designing a 350 kW turbine focused on the mid-1990s utility market that incorporated past experience and advanced technology.

  9. Diffuser for augmenting a wind turbine

    DOE Patents [OSTI]

    Foreman, Kenneth M. (North Bellmore, NY); Gilbert, Barry L. (Westbury, NY)

    1984-01-01

    A diffuser for augmenting a wind turbine having means for energizing the boundary layer at several locations along the diffuser walls is improved by the addition of a short collar extending radially outward from the outlet of the diffuser.

  10. Wave loads on offshore wind turbines

    E-Print Network [OSTI]

    Zhang, Yu, S.M. Massachusetts Institute of Technology

    2015-01-01

    Ocean energy is one of the most important sources of alternative energy and offshore floating wind turbines are considered viable and economical means of harnessing ocean energy. The accurate prediction of nonlinear ...

  11. Wind Turbine Drivetrain Condition Monitoring - An Overview

    SciTech Connect (OSTI)

    Sheng, S; Veers, P.

    2011-10-01

    This paper provides an overview of wind turbine drivetrain condition monitoring based on presentations from a condition monitoring workshop organized by the National Renewable Energy Laboratory in 2009 and on additional references.

  12. Flexible dynamics of floating wind turbines

    E-Print Network [OSTI]

    Luypaert, Thomas (Thomas J.)

    2012-01-01

    This work presents Tower Flex, a structural dynamics model for a coupled analysis of offshore floating wind turbines consisting of a tower, a floating platform and a mooring system. In this multi-body, linear frequency-domain ...

  13. Energy 101: Wind Turbines | Department of Energy

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    the turbine's blades measure 130 feet long. Now, what's really cool is that even a small wind farm, like this one in Wyoming, can generate enough electricity to power more than...

  14. Riso-M-2546 g Wind Turbine Test

    E-Print Network [OSTI]

    Riso-M-2546 g Wind Turbine Test Wind Matic WM 17S Troels Friis Pedersen The Test Station for Windmills Riso National Laboratory, DK-4000 Roskilde Denmark April 1986 #12;#12;RIS0-M-2546 WIND TURBINE describes standard measurements performed on a Wind-Matic WM 17S, 75 kW wind turbine. The measurements

  15. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    3.2.1 Description of Test Wind Turbine . . . . . .Figure 1.2: Components of a modern wind turbine . . . . . .Experimental and Numerical Seismic Response of a 65-kW Wind

  16. Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine

    E-Print Network [OSTI]

    Hoen, Ben

    2010-01-01

    Renewable Energy (Wind & Hydropower Technologies Program) ofRenewable Energy Wind & Hydropower Technologies Program U.S.Renewable Energy (Wind & Hydropower Technologies Program) of

  17. Passively cooled direct drive wind turbine

    DOE Patents [OSTI]

    Costin, Daniel P. (Chelsea, VT)

    2008-03-18

    A wind turbine is provided that passively cools an electrical generator. The wind turbine includes a plurality of fins arranged peripherally around a generator house. Each of the fins being oriented at an angle greater than zero degrees to allow parallel flow of air over the fin. The fin is further tapered to allow a constant portion of the fin to extend beyond the air stream boundary layer. Turbulence initiators on the nose cone further enhance heat transfer at the fins.

  18. Tutorial of Wind Turbine Control for Supporting Grid Frequency through Active Power Control: Preprint

    SciTech Connect (OSTI)

    Aho, J.; Buckspan, A.; Laks, J.; Fleming, P.; Jeong, Y.; Dunne, F.; Churchfield, M.; Pao, L.; Johnson, K.

    2012-03-01

    As wind energy becomes a larger portion of the world's energy portfolio and wind turbines become larger and more expensive, wind turbine control systems play an ever more prominent role in the design and deployment of wind turbines. The goals of traditional wind turbine control systems are maximizing energy production while protecting the wind turbine components. As more wind generation is installed there is an increasing interest in wind turbines actively controlling their power output in order to meet power setpoints and to participate in frequency regulation for the utility grid. This capability will be beneficial for grid operators, as it seems possible that wind turbines can be more effective at providing some of these services than traditional power plants. Furthermore, establishing an ancillary market for such regulation can be beneficial for wind plant owner/operators and manufacturers that provide such services. In this tutorial paper we provide an overview of basic wind turbine control systems and highlight recent industry trends and research in wind turbine control systems for grid integration and frequency stability.

  19. Economic Impacts of Wind Turbine Development in U.S. Counties

    E-Print Network [OSTI]

    J., Brown

    2012-01-01

    15 percent)). Cumulative wind turbine capacity installed inper capita income of wind turbine development (measured inour sample, cumulative wind turbine capacity on a per person

  20. NREL Small Wind Turbine Test Project: Mariah Power's Windspire Wind Turbine Test Chronology

    SciTech Connect (OSTI)

    Huskey, A.; Forsyth, T.

    2009-06-01

    This report presents a chronology of tests conducted at NREL's National Wind Technology Center on Mariah Power's Windspire 1.2-kW wind turbine and a letter of response from Mariah Power.

  1. Wind Turbine Generator System Power Performance Test Report for the Entegrity EW50 Wind Turbine

    SciTech Connect (OSTI)

    Smith, J.; Huskey, A.; Jager, D.; Hur, J.

    2011-05-01

    Report on the results of the power performance test that the National Renewable Energy Laboratory (NREL) conducted on Entegrity Wind System Inc.'s EW50 small wind turbine.

  2. Wake Flow Simulations for a Mid-Sized Rim Driven Wind Turbine

    SciTech Connect (OSTI)

    Rob O. Hovsapian; Various

    2014-06-01

    The onshore land where wind farms with conventional wind turbines can be places is limited by various factors including a requirement for relatively high wind speed for turbines' efficient operations. Where such a requirement cannot be met, mid-and small-sized turbines can be a solution. In the current paper simulations for near and for wakes behind a mid-sized Rim Driven Wind Turbine developed by Keuka Energy LLC is analyzed. The purposes of this study is to better understand the wake structure for more efficient wind farm planning. Simulations are conducted with the commercial CFD software STARCCM+

  3. Wind energy, with an annual growth of about 30%, represents one of the fastest growing renewable energy sources. Continuous long-term monitoring of wind turbines can greatly reduce maintenance

    E-Print Network [OSTI]

    Stanford University

    renewable energy sources. Continuous long-term monitoring of wind turbines can greatly reduce maintenance the profitability of wind turbines. A decentralized wind turbine monitoring system has been developed and installed on a 500 kW wind turbine in Germany. During its operation, temporary malfunctions of the installed sensing

  4. Characterizing Inflow Conditions Across the Rotor Disk of a Utility-Scale Wind Turbine (Poster)

    SciTech Connect (OSTI)

    Clifton, A.; Lundquist, J. K.; Kelley, N.; Scott, G.; Jager, D.; Schreck, S.

    2012-01-01

    Multi-megawatt utility-scale wind turbines operate in a turbulent, thermally-driven atmosphere where wind speed and air temperature vary with height. Turbines convert the wind's momentum into electrical power, and so changes in the atmosphere across the rotor disk influence the power produced by the turbine. To characterize the inflow into utility scale turbines at the National Wind Technology Center (NWTC) near Boulder, Colorado, NREL recently built two 135-meter inflow monitoring towers. This poster introduces the towers and the measurements that are made, showing some of the data obtained in the first few months of operation in 2011.

  5. Jet spoiler arrangement for wind turbine

    DOE Patents [OSTI]

    Cyrus, Jack D. (Corrales, NM); Kadlec, Emil G. (Albuquerque, NM); Klimas, Paul C. (Albuquerque, NM)

    1985-01-01

    An air jet spoiler arrangement is provided for a Darrieus-type vertical axis wind-powered turbine. Air is drawn into hollow turbine blades through air inlets at the ends thereof and is ejected in the form of air jets through small holes or openings provided along the lengths of the blades. The air jets create flow separation at the surfaces of the turbine blades, thereby inducing stall conditions and reducing the output power. A feedback control unit senses the power output of the turbine and controls the amount of air drawn into the air inlets accordingly.

  6. Jet spoiler arrangement for wind turbine

    DOE Patents [OSTI]

    Cyrus, J.D.; Kadlec, E.G.; Klimas, P.C.

    1983-09-15

    An air jet spoiler arrangement is provided for a Darrieus-type vertical axis wind-powered turbine. Air is drawn into hollow turbine blades through air inlets at the end thereof and is ejected in the form of air jets through small holes or openings provided along the lengths of the blades. The air jets create flow separation at the surfaces of the turbine blades, thereby including stall conditions and reducing the output power. A feedback control unit senses the power output of the turbine and controls the amount of air drawn into the air inlets accordingly.

  7. AWEA O&M Recommended Practices Series Part VII: Wind Turbine Gear Lubricant Flushing Procedures

    Broader source: Energy.gov [DOE]

    The AWEA Operations and Maintenance Recommended Practice 101 was developed to provide guidance to the wind industry regarding proper methods of wind turbine gearbox flushing and oil conversion...

  8. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    to reduce the cost of all future floating wind turbines andwind turbine is an important factor in the design of these structures, reducing the cost

  9. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    wind turbine. ” Report No. Riso-R-1500(EN), Risø Nationalwind turbine. ” Report No. Riso-R-1500(EN), Risø National

  10. Xi an Nordex Wind Turbine Co Ltd aka Xi an Weide Wind Power Equipment...

    Open Energy Info (EERE)

    Xi an Nordex Wind Turbine Co Ltd aka Xi an Weide Wind Power Equipment Co Ltd Jump to: navigation, search Name: Xi'an Nordex Wind Turbine Co Ltd (aka Xi'an Weide Wind Power...

  11. Collegiate Wind Competition Turbines go Blade-to-Blade in Wind...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Collegiate Wind Competition Turbines go Blade-to-Blade in Wind Tunnel Tests at WINDPOWER Collegiate Wind Competition Turbines go Blade-to-Blade in Wind Tunnel Tests at WINDPOWER...

  12. Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine

    E-Print Network [OSTI]

    Hoen, Ben

    2010-01-01

    Administration (NOAA) buoy in Penobscot Bay roughly tenleaves on the trees). NOAA buoy number F01: West Penobscotdataset. Table 1: Turbine, Buoy, and Respondent Descriptive

  13. Alstom 3-MW Wind Turbine Installed at NWTC (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2011-09-01

    The 3-MW Alstom wind turbine was installed at NREL's NWTC in October 2010. Test data will be used to validate advanced turbine design and analysis tools. NREL signed a Cooperative Research and Development Agreement with Alstom in 2010 to conduct certification testing on the company's 3-MW ECO 100 wind turbine and to validate models of Alstom's unique drivetrain concept. The turbine was installed at NREL's National Wind Technology Center (NWTC) in October 2010 and engineers began certification testing in 2011. Tests to be conducted by NREL include a power quality test to finalize the International Electrotechnical Commission (IEC) requirements for type certification of the 60-Hz unit. The successful outcome of this test will enable Alstom to begin commercial production of ECO 100 in the United States. NREL also will obtain additional measurements of power performance, acoustic noise, and system frequency to complement the 50 Hz results previously completed in Europe. After NREL completes the certification testing on the ECO 100, it will conduct long-term testing to validate gearbox performance to gain a better understanding of the machine's unique ALSTOM PURE TORQUE{trademark} drivetrain concept. In conventional wind turbines, the rotor is supported by the shaft-bearing gearbox assembly. Rotor loads are partially transmitted to the gearbox and may reduce gearbox reliability. In the ALSTOM PURE TORQUE concept, the rotor is supported by a cast frame running through the hub, which transfers bending loads directly to the tower. Torque is transmitted to the shaft through an elastic coupling at the front of the hub. According to Alstom, this system will increase wind turbine reliability and reduce operation and maintenance costs by isolating the gearbox from rotor loads. Gearbox reliability has challenged the wind energy industry for more than two decades. Gearbox failures require expensive and time-consuming replacement, significantly increasing the cost of wind plant operation while reducing the plant's power output and revenue. To solve gearbox reliability issues, NREL launched a Gearbox Reliability Collaborative (GRC) in 2006 and brought together the world's leading turbine manufacturers, consultants, and experts from more than 30 companies and organizations. GRC's goal was to validate the typical design process-from wind turbine system loads to bearing ratings-through a comprehensive dynamometer and field-test program. Design analyses will form a basis for improving reliability of future designs and retrofit packages. Through its study of Alstom's Eco 100 gearbox, NREL can compare its GRC model gearbox with Alstom's and add the results to the GRC database, which is helping to advance more reliable wind turbine technology.

  14. Variable diameter wind turbine rotor blades

    DOE Patents [OSTI]

    Jamieson, Peter McKeich; Hornzee-Jones, Chris; Moroz, Emilian M.; Blakemore, Ralph W.

    2005-12-06

    A system and method for changing wind turbine rotor diameters to meet changing wind speeds and control system loads is disclosed. The rotor blades on the wind turbine are able to adjust length by extensions nested within or containing the base blade. The blades can have more than one extension in a variety of configurations. A cable winching system, a hydraulic system, a pneumatic system, inflatable or elastic extensions, and a spring-loaded jack knife deployment are some of the methods of adjustment. The extension is also protected from lightning by a grounding system.

  15. Impact of Increasing Distributed Wind Power and Wind Turbine Siting on Rural Distribution Feeder Voltage Profiles: Preprint

    SciTech Connect (OSTI)

    Allen, A.; Zhang, Y. C.; Hodge, B. M.

    2013-09-01

    Many favorable wind energy resources in North America are located in remote locations without direct access to the transmission grid. Building transmission lines to connect remotely-located wind power plants to large load centers has become a barrier to increasing wind power penetration in North America. By connecting utility-sized megawatt-scale wind turbines to the distribution system, wind power supplied to consumers could be increased greatly. However, the impact of including megawatt-scale wind turbines on distribution feeders needs to be studied. The work presented here examined the impact that siting and power output of megawatt-scale wind turbines have on distribution feeder voltage. This is the start of work to present a general guide to megawatt-scale wind turbine impact on the distribution feeder and finding the amount of wind power that can be added without adversely impacting the distribution feeder operation, reliability, and power quality.

  16. Wind Turbines and Health A Rapid Review of the Evidence

    E-Print Network [OSTI]

    Firestone, Jeremy

    1 Wind Turbines and Health A Rapid Review of the Evidence July 2010 #12;2 Wind Turbines and Health of the evidence from current literature on the issue of wind turbines and potential impacts on human health: There are no direct pathological effects from wind farms and that any potential impact on humans can be minimised

  17. Dynamic Simulation of DFIG Wind Turbines on FPGA Boards

    E-Print Network [OSTI]

    Zambreno, Joseph A.

    Dynamic Simulation of DFIG Wind Turbines on FPGA Boards Hao Chen, Student Member, IEEE, Song Sun is a friction coefficient. The wind turbine model is based on the relation between the upstream wind speed V w + 1 where p is the air density; Rw is the wind turbine radius; cp (A, (3) is the performance

  18. Wind Turbine Test \\^ind Matic WM 15S

    E-Print Network [OSTI]

    00 ·2 V. v/ RisoM-2481 Wind Turbine Test \\^ind Matic WM 15S Troels Friis Pedersent The Test Station for Windmills Riso National Laboratory, DK-4000 Roskilde, Denmark July 1986 #12;#12;RIS0-M-2481 WIND TURBINE describes standard measurements performed on a Wind-Matic WM 15S, 55 kW wind turbine. The measurements

  19. innovati nNREL Computer Models Integrate Wind Turbines with

    E-Print Network [OSTI]

    innovati nNREL Computer Models Integrate Wind Turbines with Floating Platforms Far off the shores for today's seabed-mounted offshore wind turbines. For the United States to tap into these vast offshore wind energy resources, wind turbines must be mounted on floating platforms to be cost effective

  20. Quantifying the hurricane risk to offshore wind turbines

    E-Print Network [OSTI]

    Jaramillo, Paulina

    Quantifying the hurricane risk to offshore wind turbines Stephen Rosea , Paulina Jaramilloa,1. Turbine tower buckling has been observed in typhoons, but no offshore wind turbines have yet been built be destroyed by hurricanes in an offshore wind farm. We apply this model to estimate the risk to offshore wind

  1. Load attenuating passively adaptive wind turbine blade

    DOE Patents [OSTI]

    Veers, Paul S.; Lobitz, Donald W.

    2003-01-07

    A method and apparatus for improving wind turbine performance by alleviating loads and controlling the rotor. The invention employs the use of a passively adaptive blade that senses the wind velocity or rotational speed, and accordingly modifies its aerodynamic configuration. The invention exploits the load mitigation prospects of a blade that twists toward feather as it bends. The invention includes passively adaptive wind turbine rotors or blades with currently preferred power control features. The apparatus is a composite fiber horizontal axis wind-turbine blade, in which a substantial majority of fibers in the blade skin are inclined at angles of between 15 and 30 degrees to the axis of the blade, to produces passive adaptive aeroelastic tailoring (bend-twist coupling) to alleviate loading without unduly jeopardizing performance.

  2. Load attenuating passively adaptive wind turbine blade

    DOE Patents [OSTI]

    Veers, Paul S. (Albuquerque, NM); Lobitz, Donald W. (Albuquerque, NM)

    2003-01-01

    A method and apparatus for improving wind turbine performance by alleviating loads and controlling the rotor. The invention employs the use of a passively adaptive blade that senses the wind velocity or rotational speed, and accordingly modifies its aerodynamic configuration. The invention exploits the load mitigation prospects of a blade that twists toward feather as it bends. The invention includes passively adaptive wind turbine rotors or blades with currently preferred power control features. The apparatus is a composite fiber horizontal axis wind-turbine blade, in which a substantial majority of fibers in the blade skin are inclined at angles of between 15 and 30 degrees to the axis of the blade, to produces passive adaptive aeroelastic tailoring (bend-twist coupling) to alleviate loading without unduly jeopardizing performance.

  3. Wind Turbine Micropitting Workshop: A Recap

    SciTech Connect (OSTI)

    Sheng, S.

    2010-02-01

    Micropitting is a Hertzian fatigue phenomenon that affects many wind turbine gearboxes, and it affects the reliability of the machines. With the major growth and increasing dependency on renewable energy, mechanical reliability is an extremely important issue. The U.S. Department of Energy has made a commitment to improving wind turbine reliability and the National Renewable Energy Laboratory (NREL) has started a gearbox reliability project. Micropitting as an issue that needed attention came to light through this effort. To understand the background of work that had already been accomplished, and to consolidate some level of collective understanding of the issue by acknowledged experts, NREL hosted a wind turbine micropitting workshop, which was held at the National Wind Technology Center in Boulder, Colorado, on April 15 and 16, 2009.

  4. 2014 Sandia Wind Turbine Blade Workshop

    Broader source: Energy.gov [DOE]

    The U.S. Energy Department's Sandia National Laboratories will host its 2014 Sandia Wind Turbine Blade Workshop at the Marriott Pyramid North in Albuquerque, New Mexico. The workshop provides a unique, blade focused collaborative forum that will bring together wind energy leaders from industry, academia, and government. Stay tuned for updates. Information regarding past Wind Workshops can be found at: http://windworkshops.sandia.gov/.

  5. 2011_AWEA_Small_Wind_Turbine_Market_Report.pdf | Department of...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    11AWEASmallWindTurbineMarketReport.pdf 2011AWEASmallWindTurbineMarketReport.pdf 2011AWEASmallWindTurbineMarketReport.pdf 2011AWEASmallWindTurbineMarketRepor...

  6. SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES damage in real size structural components of offshore wind turbines. KEYWORDS : Damage detection, Offshore wind turbines, Numerical response simulation. INTRODUCTION Offshore wind turbines are exposed

  7. Adaptive pitch control for variable speed wind turbines

    DOE Patents [OSTI]

    Johnson, Kathryn E. (Boulder, CO); Fingersh, Lee Jay (Westminster, CO)

    2012-05-08

    An adaptive method for adjusting blade pitch angle, and controllers implementing such a method, for achieving higher power coefficients. Average power coefficients are determined for first and second periods of operation for the wind turbine. When the average power coefficient for the second time period is larger than for the first, a pitch increment, which may be generated based on the power coefficients, is added (or the sign is retained) to the nominal pitch angle value for the wind turbine. When the average power coefficient for the second time period is less than for the first, the pitch increment is subtracted (or the sign is changed). A control signal is generated based on the adapted pitch angle value and sent to blade pitch actuators that act to change the pitch angle of the wind turbine to the new or modified pitch angle setting, and this process is iteratively performed.

  8. Full-scale wind turbine rotor aerodynamics research

    SciTech Connect (OSTI)

    Simms, D A; Butterfield, C P

    1994-11-01

    The United States Department of Energy and the National Renewable Energy Laboratory (NREL) are conducting research to improve wind turbine technology at the NREL National Wind Technology Center (NWTC). One program, the Combined Experiment, has focused on making measurements needed to understand aerodynamic and structural responses of horizontal-axis wind turbines (HAWT). A new phase of this program, the Unsteady Aerodynamics Experiment, will focus on quantifying unsteady aerodynamic phenomena prevalent in stall-controlled HAWTs. Optimally twisted blades and innovative instrumentation and data acquisition systems will be used in these tests. Data can now be acquired and viewed interactively during turbine operations. This paper describes the NREL Unsteady Aerodynamics Experiment and highlights planned future research activities.

  9. Smart Structures and Systems, Vol. 6, No. 3 (2010) 000-000 1 Structural monitoring of wind turbines using wireless

    E-Print Network [OSTI]

    Sweetman, Bert

    2010-01-01

    Smart Structures and Systems, Vol. 6, No. 3 (2010) 000-000 1 Structural monitoring of wind turbines such as wind turbines is becoming increasingly critical; however acquisition of the dynamic output data can are installed in three operational turbines in order to demonstrate their efficacy in this unique operational

  10. Wind Turbine Towers for Greater Hub Heights Why higher wind turbine tower can contribute to increase energy

    E-Print Network [OSTI]

    McCalley, James D.

    towers represent 26% of the total WTG (Wind Turbine Generator) cost #12;Why concrete towerWind Turbine Towers for Greater Hub Heights Why higher wind turbine tower can contribute to increase energy output? · Energy output is proportional to the cube of wind velocity, 100m towers (versus

  11. Methods and apparatus for reducing peak wind turbine loads

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw

    2007-02-13

    A method for reducing peak loads of wind turbines in a changing wind environment includes measuring or estimating an instantaneous wind speed and direction at the wind turbine and determining a yaw error of the wind turbine relative to the measured instantaneous wind direction. The method further includes comparing the yaw error to a yaw error trigger that has different values at different wind speeds and shutting down the wind turbine when the yaw error exceeds the yaw error trigger corresponding to the measured or estimated instantaneous wind speed.

  12. Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    include some offshore wind turbines. That said, the factoffshore wind still accounts for a relatively small portion of Vestas’ turbine

  13. Wind Turbine Generator System Duration Test Report for the Mariah Power Windspire Wind Turbine

    SciTech Connect (OSTI)

    Huskey, A.; Bowen, A.; Jager, D.

    2010-05-01

    This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, five turbines are being tested at the National Wind Technology Center (NWTC) as a part of the first round of this project. Duration testing is one of up to five tests that may be performed on the turbines. Other tests include power performance, safety and function, noise, and power quality tests. NWTC testing results provide manufacturers with reports that may be used to meet part of small wind turbine certification requirements. This duration test report focuses on the Mariah Power Windspire wind turbine.

  14. Methods of making wind turbine rotor blades

    DOE Patents [OSTI]

    Livingston, Jamie T. (Pensacola, FL); Burke, Arthur H. E. (Gulf Breeze, FL); Bakhuis, Jan Willem (Nijverdal, NL); Van Breugel, Sjef (Enschede, NL); Billen, Andrew (Daarlerveen, NL)

    2008-04-01

    A method of manufacturing a root portion of a wind turbine blade includes, in an exemplary embodiment, providing an outer layer of reinforcing fibers including at least two woven mats of reinforcing fibers, providing an inner layer of reinforcing fibers including at least two woven mats of reinforcing fibers, and positioning at least two bands of reinforcing fibers between the inner and outer layers, with each band of reinforcing fibers including at least two woven mats of reinforcing fibers. The method further includes positioning a mat of randomly arranged reinforcing fibers between each pair of adjacent bands of reinforcing fibers, introducing a polymeric resin into the root potion of the wind turbine blade, infusing the resin through the outer layer, the inner layer, each band of reinforcing fibers, and each mat of random reinforcing fibers, and curing the resin to form the root portion of the wind turbine blade.

  15. A doubly-fed permanent magnet generator for wind turbines

    E-Print Network [OSTI]

    Thomas, Andrew J. (Andrew Joseph), 1981-

    2004-01-01

    Optimum extraction of energy from a wind turbine requires that turbine speed vary with wind speed. Existing solutions to produce constant-frequency electrical output under windspeed variations are undesirable due to ...

  16. Multi-hazard Reliability Assessment of Offshore Wind Turbines 

    E-Print Network [OSTI]

    Mardfekri Rastehkenari, Maryam 1981-

    2012-12-04

    A probabilistic framework is developed to assess the structural reliability of offshore wind turbines. Probabilistic models are developed to predict the deformation, shear force and bending moment demands on the support structure of wind turbines...

  17. United States Launches First Grid-Connected Offshore Wind Turbine...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    United States Launches First Grid-Connected Offshore Wind Turbine United States Launches First Grid-Connected Offshore Wind Turbine August 22, 2013 - 12:00am Addthis Leveraging an...

  18. Distributed Wind Market Report: Small Turbines Lead to Big Growth...

    Energy Savers [EERE]

    Distributed Wind Market Report: Small Turbines Lead to Big Growth in Exports Distributed Wind Market Report: Small Turbines Lead to Big Growth in Exports August 18, 2014 - 12:13pm...

  19. Reduced Order Structural Modeling of Wind Turbine Blades 

    E-Print Network [OSTI]

    Jonnalagadda, Yellavenkatasunil

    2011-10-21

    Conventional three dimensional structural analysis methods prove to be expensive for the preliminary design of wind turbine blades. However, wind turbine blades are large slender members with complex cross sections. They can be accurately modeled...

  20. In Conjunction with Applied Mathematics Institute Wind Turbine Aerodynamics: Some

    E-Print Network [OSTI]

    Yu, Xinwei

    , that developed small wind turbine technology which he started after many years teaching at the University Springer on-line journal. His book Small Wind Turbines was published by Springer in 2011. #12;

  1. NREL Collaborates to Improve Wind Turbine Technology (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-01-01

    NREL's Gearbox Reliability Collaborative leads to wind turbine gearbox reliability, lowering the cost of energy. Unintended gearbox failures have a significant impact on the cost of wind farm operations. In 2007, the National Renewable Energy Laboratory (NREL) initiated the Gearbox Reliability Collaborative (GRC), which follows a multi-pronged approach based on a collaborative of manufacturers, owners, researchers, and consultants. The project combines analysis, field testing, dynamometer testing, condition monitoring, and the development and population of a gearbox failure database. NREL and other GRC partners have been able to identify shortcomings in the design, testing, and operation of wind turbines that contribute to reduced gearbox reliability. In contrast to private investigations of these problems, GRC findings are quickly shared among GRC participants, including many wind turbine manufacturers and equipment suppliers. Ultimately, the findings are made public for use throughout the wind industry. This knowledge will result in increased gearbox reliability and an overall reduction in the cost of wind energy. Project essentials include the development of two redesigned and heavily instrumented representative gearbox designs. Field and dynamometer tests are conducted on the gearboxes to build an understanding of how selected loads and events translate into bearing and gear response. The GRC evaluates and validates current wind turbine, gearbox, gear and bearing analytical tools/models, develops new tools/models, and recommends improvements to design and certification standards, as required. In addition, the GRC is investigating condition monitoring methods to improve turbine reliability. Gearbox deficiencies are the result of many factors, and the GRC team recommends efficient and cost-effective improvements in order to expand the industry knowledge base and facilitate immediate improvements in the gearbox life cycle.

  2. SNL Researchers Assess Wind Turbine Blade Inspection and Repair...

    Broader source: Energy.gov (indexed) [DOE]

    also inform how blade inspections are conducted at manufacturing facilities and wind farms, thereby improving maintenance and repair procedures for wind turbine blades. SNL is...

  3. State of the Art in Floating Wind Turbine Design Tools

    SciTech Connect (OSTI)

    Cordle, A.; Jonkman, J.

    2011-10-01

    This paper presents an overview of the simulation codes available to the offshore wind industry that are capable of performing integrated dynamic calculations for floating offshore wind turbines.

  4. Titan propels GE wind turbine research into new territory | ornl...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Titan propels GE wind turbine research into new territory January 17, 2014 The amount of global electricity supplied by wind, the world's fastest growing energy source, is expected...

  5. Sandia Energy - Siting: Wind Turbine/Radar Interference Mitigation...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Mitigation (TSPEAR & IFT&E) Home Stationary Power Energy Conversion Efficiency Wind Energy Siting and Barrier Mitigation Siting: Wind TurbineRadar Interference...

  6. Methods and apparatus for rotor load control in wind turbines

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw

    2006-08-22

    A wind turbine having a rotor, at least one rotor blade, and a plurality of generators, of which a first generator is configured to provide power to an electric grid and a second generator is configured to provide power to the wind turbine during times of grid loss. The wind turbine is configured to utilize power provided by the second generator to reduce loads on the wind turbine during times of grid loss.

  7. Modal Dynamics of Large Wind Turbines with Different Support Structures

    SciTech Connect (OSTI)

    Bir, G.; Jonkman, J.

    2008-07-01

    This paper presents modal dynamics of floating-platform-supported and monopile-supported offshore wind turbines.

  8. Establishment of Small Wind Turbine Regional Test Centers (Presentation)

    SciTech Connect (OSTI)

    Sinclair, K.

    2011-09-16

    This presentation offers an overview of the Regional Test Centers project for Small Wind Turbine testing and certification.

  9. Structural responses and power output of a wind turbine are strongly affected by the wind field acting on the wind turbine. Knowledge about the wind field and its

    E-Print Network [OSTI]

    Stanford University

    ABSTRACT Structural responses and power output of a wind turbine are strongly affected by the wind affect the power output and structural responses of a wind turbine. Wind field characteristics are conventionally described by time averaged features, such as mean wind speed, turbulence intensity and power

  10. Amplitude modulation of wind turbine noise

    E-Print Network [OSTI]

    Makarewicz, Rufin

    2013-01-01

    Due to swish and thump amplitude modulation, the noise of wind turbines cause more annoyance than other environmental noise of the same average level. The wind shear accounts for the thump modulation (van den Berg effect). Making use of the wind speed measurements at the hub height, as well as at the top and the bottom of the rotor disc (Fig.1), the non-standard wind profile is applied. It causes variations in the A-weighted sound pressure level, LpA. The difference between the maximum and minimum of LpA characterizes thump modulation (Fig.2).

  11. A Simplified Morphing Blade for Horizontal Axis Wind Turbines

    E-Print Network [OSTI]

    Boyer, Edmond

    A Simplified Morphing Blade for Horizontal Axis Wind Turbines Weijun WANG , St´ephane CARO, Fouad salinas@hotmail.com The aim of designing wind turbine blades is to improve the power capture ability by adjusting the twist of the blade's root and tip. To evaluate the performance of wind turbine blades

  12. Stochastic Analysis of Wind Turbine Power Curves Edgar Anahua

    E-Print Network [OSTI]

    Peinke, Joachim

    Stochastic Analysis of Wind Turbine Power Curves Edgar Anahua Oldenburg 2007 Zur Homepage der Dissertation #12;#12;Stochastic Analysis of Wind Turbine Power Curves Edgar Anahua Von der Fakult¨at f the wind turbine's power per- formance directly from high frequency fluctuating measurements. In particular

  13. AIAA980057 RELATING TURBULENCE TO WIND TURBINE BLADE LOADS

    E-Print Network [OSTI]

    Sweetman, Bert

    AIAA­98­0057 RELATING TURBULENCE TO WIND TURBINE BLADE LOADS: PARAMETRIC STUDY WITH MULTIPLE that is most useful in estimating fatigue loads on wind turbine blades. The histograms of rainflow counted for flapwise loads on three horizontal axis wind tur­ bines(HAWTs). In the case of two of these turbines

  14. EFFECTS OF FIBER WAVINESS ON COMPOSITES FOR WIND TURBINE BLADES

    E-Print Network [OSTI]

    EFFECTS OF FIBER WAVINESS ON COMPOSITES FOR WIND TURBINE BLADES J.F. Mandell D.D. Samborsky and L Composite materials of interest for wind turbine blades use relatively low cost fibers, resins and processes WORDS: Composite Materials, Fiber Waviness, Compressive Strength #12;1. INTRODUCTION Wind turbine blades

  15. PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN

    E-Print Network [OSTI]

    Sweetman, Bert

    1 PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN Lance Manuel1 Paul S-4020 ABSTRACT International standards for wind turbine certification depend on finding long-term fatigue load loads. #12;2 INTRODUCTION Design constraints for wind turbine structures fall into either extreme load

  16. AIAA-2001-0047 PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE

    E-Print Network [OSTI]

    Sweetman, Bert

    AIAA-2001-0047 1 PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN Lance 94305-4020 ABSTRACT International standards for wind turbine certification depend on finding long. INTRODUCTION Design constraints for wind turbine structures fall into either extreme load or fatigue categories

  17. AIAA-2004-1184 AN AEROACOUSTIC ANALYSIS OF WIND TURBINES*

    E-Print Network [OSTI]

    AIAA-2004-1184 1 AN AEROACOUSTIC ANALYSIS OF WIND TURBINES* Philip J. Morris, Lyle N. Long computational aeroacoustic methods that are being applied to predict the noise radiated by wind turbines. Since the wind turbine noise problem is very challenging, only some of the important noise sources and mechanisms

  18. Wind turbine impacts on HF radar ocean surface measurements in

    E-Print Network [OSTI]

    Wyatt, Lucy

    Wind turbine impacts on HF radar ocean surface measurements in Liverpool Bay Alice Robinson School. The characterisation of the wind turbine interference is assessed and the radar cross section estimated. The modulation with wind turbine interference in a HF radar footprint are made. #12;Contents Contents iv List of Tables vii

  19. AIAA-2001-0044 Extreme Load Estimation for Wind Turbines

    E-Print Network [OSTI]

    AIAA-2001-0044 Extreme Load Estimation for Wind Turbines: Issues and Opportunities for Improved design load estimation procedures for wind turbines often do not accurately treat the statistical nature of loads. Current practice for wind turbine load analysis is reviewed. The authors

  20. Cambridge Danehy Park Wind Turbine Preliminary Project Assessment

    E-Print Network [OSTI]

    Cambridge Danehy Park Wind Turbine Preliminary Project Assessment Overview MIT Wind Energy Projects Impact Community Impact Financial Analysis Turbine Evaluation Set For the full report, please visit: http 4 / 25 2.5 / 25 Rated Wind Speed (m/s) 13 10 14.5 ~15 12 The above turbines were chosen to provide

  1. ACOUSTIC STUDY OF THE UD / GAMESA WIND TURBINE PROJECT

    E-Print Network [OSTI]

    Firestone, Jeremy

    ACOUSTIC STUDY OF THE UD / GAMESA WIND TURBINE PROJECT LEWES, DELAWARE January 2009 #12;ACOUSTIC STUDY OF THE UNIVERSITY OF DELAWARE / GAMESA WIND TURBINE PROJECT LEWES, DELAWARE Prepared for SUMMARY The University of Delaware (UD), Lewes proposes to locate a Gamesa G90 2.0MW wind turbine

  2. innovati nWind Turbine Design Innovations Drive Industry Transformation

    E-Print Network [OSTI]

    innovati nWind Turbine Design Innovations Drive Industry Transformation For more than 20 years. Tackling Turbine Blade Inefficiencies In 1984, NREL researchers began investigating problems with wind turbine blade designs. Inefficiency was a significant barrier to lowering the cost of wind energy

  3. Dynamic wind turbine models in power system simulation tool

    E-Print Network [OSTI]

    Dynamic wind turbine models in power system simulation tool DIgSILENT Anca D. Hansen, Florin Iov Iov, Poul Sørensen, Nicolaos Cutululis, Clemens Jauch, Frede Blaabjerg Title: Dynamic wind turbine system simulation tool PowerFactory DIgSILENT for different wind turbine concepts. It is the second

  4. Ris-R-1209(EN) European Wind Turbine Testing

    E-Print Network [OSTI]

    Risø-R-1209(EN) European Wind Turbine Testing Procedure Developments Task 1: Measurement Method to Verify Wind Turbine Performance Character- istics Raymond Hunter RES Task coordinator Troels Friis assessment and wind turbine power performance testing. A standards maintenance team is revising the current

  5. Vortex Lattice Modelling of Winglets on Wind Turbine Blades

    E-Print Network [OSTI]

    Vortex Lattice Modelling of Winglets on Wind Turbine Blades Mads Døssing Risø-R-1621(EN) Risø Title: Vortex Lattice Modelling of Winglets on Wind Turbine Blades Departments: Wind Energy Department turbines can be increased by the use of winglets without increasing the swept area. This makes them

  6. Mechanisms of amplitude modulation in wind turbine , A. J. Bullmoreb

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Mechanisms of amplitude modulation in wind turbine noise M. Smitha , A. J. Bullmoreb , M. M. Candb produced by wind turbines is inherently time varying. This amplitude modulation is normally due The environmental noise impact of wind turbine generators has to be assessed when planning new installations

  7. LIGHTNING EXPOSURE OF WIND TURBINES University of Toronto

    E-Print Network [OSTI]

    Lehn, Peter W.

    LIGHTNING EXPOSURE OF WIND TURBINES Dale Dolan University of Toronto e-mail: dale@ecf.utoronto.ca Abstract This paper applies the electrogeometric model of lightning exposure to a wind turbine to compute. For a typical 45 m wind turbine, the probability of being struck by a downward negative flash, as predicted

  8. Potential Flow Modelling for Wind Turbines Shane Cline

    E-Print Network [OSTI]

    Victoria, University of

    Potential Flow Modelling for Wind Turbines by Shane Cline B.Sc., University of Toledo, 2003 M means, without the permission of the author. #12;ii Potential Flow Modelling for Wind Turbines by Shane potential flow methods are a promising alternative to mainstream wind turbine aerodynamics tools

  9. Ris-R-1352(EN) Models for Wind Turbines

    E-Print Network [OSTI]

    Risø-R-1352(EN) Models for Wind Turbines ­ a Collection Andreas Baumgart Gunner C. Larsen, Morten H is to supply new approaches to stability investigations of wind turbines. The author's opinion #12;Contents 1 Preface 5 2 Author's Notes 7 3 Theory of Rods applied to Wind Turbine Blades 9 3

  10. Detection of aeroacoustic sound sources on aircraft and wind turbines

    E-Print Network [OSTI]

    Twente, Universiteit

    Detection of aeroacoustic sound sources on aircraft and wind turbines Stefan Oerlemans #12;Detection of aeroacoustic sound sources on aircraft and wind turbines S. Oerlemans Thesis University;DETECTION OF AEROACOUSTIC SOUND SOURCES ON AIRCRAFT AND WIND TURBINES PROEFSCHRIFT ter verkrijging van de

  11. Taming Hurricanes With Arrays of Offshore Wind Turbines

    E-Print Network [OSTI]

    Firestone, Jeremy

    Taming Hurricanes With Arrays of Offshore Wind Turbines Mark Z. Jacobson Cristina Archer, Willet #12;Representation of a vertically-resolved wind turbine in model Lines are model layers) or 50 m/s (destruction) speed. Can Walls of Offshore Wind Turbines Dissipate Hurricanes? #12;Katrina

  12. Development of Wind Turbines Prototyping Software Under Matlab/Simulink

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    204 1 Development of Wind Turbines Prototyping Software Under Matlab/Simulink® Through present the development of a wind turbine prototyping software under Matlab/Simulink® through and the end of 1999, around 75% of all new grid-connected wind turbines worldwide were installed in Europe [3

  13. Scour around an offshore wind turbine W.F. Louwersheimer

    E-Print Network [OSTI]

    Langendoen, Koen

    Scour around an offshore wind turbine MSc Thesis W.F. Louwersheimer January, 2007 Delft University #12;Scour around an offshore wind turbine Delft University of Technology Ballast Nedam - Egmond iii Scour around an offshore wind turbine W.F. Louwersheimer Student number 1067419 January, 2007

  14. Duration Test Report for the Entegrity EW50 Wind Turbine

    SciTech Connect (OSTI)

    Smith, J.; Huskey, A.; Jager, D.; Hur, J.

    2012-12-01

    This report summarizes the results of a duration test that NREL conducted on the Entegrity EW50 wind turbine. This test was conducted in accordance with the International Electrotechnical Commissions' (IEC) standard, Wind Turbine Generator System Part 2: Design requirements for small wind turbines, IEC 61400-2 Ed.2.0, 2006-03.

  15. Collegiate Wind Competition Turbines go Blade-to-Blade in Wind...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Turbines go Blade-to-Blade in Wind Tunnel Tests at WINDPOWER Collegiate Wind Competition Turbines go Blade-to-Blade in Wind Tunnel Tests at WINDPOWER March 28, 2014 - 5:11pm...

  16. Effectiveness of Changing Wind Turbine Cut-in Speed to Reduce Bat Fatalities at Wind Facilities

    SciTech Connect (OSTI)

    Manuela M. P. Huso; John P. Hayes

    2009-04-01

    This report details an experiment on the effectiveness of changing wind turbine cut-in speed on reducing bat fatality from wind turbines at the Casselman Wind Project in Somerset County, Pennsylvania.

  17. WIND TURBINE SITING IN AN URBAN ENVIRONMENT: THE HULL, MA 660 KW TURBINE

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    1 WIND TURBINE SITING IN AN URBAN ENVIRONMENT: THE HULL, MA 660 KW TURBINE J. F. Manwell, J. G. Mc turbine at Windmill Point in Hull, Massachusetts represents a high point in the long history of wind, through the installation of a 40 kW Enertech machine in the 1980's to the installation of the new turbine

  18. Wind Turbine Generator System Power Quality Test Report for the Gaia Wind 11-kW Wind Turbine

    SciTech Connect (OSTI)

    Curtis, A.; Gevorgian, V.

    2011-07-01

    This report details the power quality test on the Gaia Wind 11-kW Wind Turbine as part of the U.S. Department of Energy's Independent Testing Project. In total five turbines are being tested as part of the project. Power quality testing is one of up to five test that may be performed on the turbines including power performance, safety and function, noise, and duration tests. The results of the testing provide manufacturers with reports that may be used for small wind turbine certification.

  19. Built-Environment Wind Turbine Roadmap

    SciTech Connect (OSTI)

    Smith, J.; Forsyth, T.; Sinclair, K.; Oteri, F.

    2012-11-01

    Although only a small contributor to total electricity production needs, built-environment wind turbines (BWTs) nonetheless have the potential to influence the public's consideration of renewable energy, and wind energy in particular. Higher population concentrations in urban environments offer greater opportunities for project visibility and an opportunity to acquaint large numbers of people to the advantages of wind projects on a larger scale. However, turbine failures will be equally visible and could have a negative effect on public perception of wind technology. This roadmap provides a framework for achieving the vision set forth by the attendees of the Built-Environment Wind Turbine Workshop on August 11 - 12, 2010, at the U.S. Department of Energy's National Renewable Energy Laboratory. The BWT roadmap outlines the stakeholder actions that could be taken to overcome the barriers identified. The actions are categorized as near-term (0 - 3 years), medium-term (4 - 7 years), and both near- and medium-term (requiring immediate to medium-term effort). To accomplish these actions, a strategic approach was developed that identifies two focus areas: understanding the built-environment wind resource and developing testing and design standards. The authors summarize the expertise and resources required in these areas.

  20. EIS-0006: Wind Turbine Generator System, Block Island, Rhode Island

    Broader source: Energy.gov [DOE]

    The U.S. Department of Energy prepared this EIS to evaluate the environmental impacts of installing and operating a large experimental wind turbine, designated the MOD-OA, which is proposed to be installed on a knoll in Rhode Island's New Meadow Hill Swamp, integrated with the adjacent Block Island Power Company power plant and operated to supply electricity to the existing utility network.

  1. Root region airfoil for wind turbine

    DOE Patents [OSTI]

    Tangler, James L. (Boulder, CO); Somers, Dan M. (State College, PA)

    1995-01-01

    A thick airfoil for the root region of the blade of a wind turbine. The airfoil has a thickness in a range from 24%-26% and a Reynolds number in a range from 1,000,000 to 1,800,000. The airfoil has a maximum lift coefficient of 1.4-1.6 that has minimum sensitivity to roughness effects.

  2. Wooden wind turbine blade manufacturing process

    DOE Patents [OSTI]

    Coleman, Clint (Warren, VT)

    1986-01-01

    A wooden wind turbine blade is formed by laminating wood veneer in a compression mold having the exact curvature needed for one side of the blade, following which the other side of the blade is ground flat along its length but twisted with respect to the blade axis.

  3. Redesign of a wind turbine hub

    E-Print Network [OSTI]

    Hunter-Jones, Bridget I

    2014-01-01

    The current designs of wind turbine hubs contain many faults. The slew ring bearing that connects the blade to the hub takes on a large bending moment that in many cases causes the joints to fail and the blade to break ...

  4. Power Performance Test Report for the SWIFT Wind Turbine

    SciTech Connect (OSTI)

    Mendoza, I.; Hur, J.

    2012-12-01

    This report summarizes the results of a power performance test that NREL conducted on the SWIFT wind turbine. This test was conducted in accordance with the International Electrotechnical Commission's (IEC) standard, Wind Turbine Generator Systems Part 12: Power Performance Measurements of Electricity Producing Wind Turbines, IEC 61400-12-1 Ed.1.0, 2005-12. However, because the SWIFT is a small turbine as defined by IEC, NREL also followed Annex H that applies to small wind turbines. In these summary results, wind speed is normalized to sea-level air density.

  5. Wind/Wave Misalignment in the Loads Analysis of a Floating Offshore Wind Turbine: Preprint

    SciTech Connect (OSTI)

    Barj, L.; Stewart, S.; Stewart, G.; Lackner, M.; Jonkman, J.; Robertson, A.

    2014-02-01

    Wind resources far from the shore and in deeper seas have encouraged the offshore wind industry to look into floating platforms. The International Electrotechnical Commission (IEC) is developing a new technical specification for the design of floating offshore wind turbines that extends existing design standards for land-based and fixed-bottom offshore wind turbines. The work summarized in this paper supports the development of best practices and simulation requirements in the loads analysis of floating offshore wind turbines by examining the impact of wind/wave misalignment on the system loads under normal operation. Simulations of the OC3-Hywind floating offshore wind turbine system under a wide range of wind speeds, significant wave heights, peak-spectral periods and wind/wave misalignments have been carried out with the aero-servo-hydro-elastic tool FAST [4]. The extreme and fatigue loads have been calculated for all the simulations. The extreme and fatigue loading as a function of wind/wave misalignment have been represented as load roses and a directional binning sensitivity study has been carried out. This study focused on identifying the number and type of wind/wave misalignment simulations needed to accurately capture the extreme and fatigue loads of the system in all possible metocean conditions considered, and for a down-selected set identified as the generic US East Coast site. For this axisymmetric platform, perpendicular wind and waves play an important role in the support structure and including these cases in the design loads analysis can improve the estimation of extreme and fatigue loads. However, most structural locations see their highest extreme and fatigue loads with aligned wind and waves. These results are specific to the spar type platform, but it is expected that the results presented here will be similar to other floating platforms.

  6. Duration Test Report for the Viryd CS8 Wind Turbine

    SciTech Connect (OSTI)

    Roadman, J.; Murphy, M.; van Dam, J.

    2013-06-01

    This report summarizes the results of a duration noise test that the National Renewable Energy Laboratory (NREL) conducted on the Viryd CS8 wind turbine. This test was conducted in accordance with Clause 9.4 of the International Electrotechnical Commission's (IEC) standard, Wind turbines - Part 2: Design requirements for small wind turbines, IEC 61400-2 Ed. 2.0:2006-03. NREL researchers evaluated the turbine based on structural integrity and material degradation, quality of environmental protection, and dynamic behavior.

  7. Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine

    E-Print Network [OSTI]

    Hoen, Ben

    2010-01-01

    Analysis in Vinalhaven, Maine Ben Hoen, Haftan Eckholdt, andAnalysis in Vinalhaven, Maine Prepared for the Office ofturbine, 4.5 MW Vinalhaven, Maine wind power facility, which

  8. Wind Turbine Generator System Acoustic Noise Test Report for the ARE 442 Wind Turbine

    SciTech Connect (OSTI)

    Huskey, A.; van Dam, J.

    2010-11-01

    This test was conducted on the ARE 442 as part of the U.S. Department of Energy's (DOE's) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, five turbines are being tested at the National Wind Technology Center (NWTC) as a part of this project. Acoustic noise testing is one of up to five tests that may be performed on the turbines, including duration, safety and function, power performance, and power quality tests. The acoustic noise test was conducted to the IEC 61400-11 Edition 2.1.

  9. IMPLEMENTATION OF WIND TURBINE CONTROLLERS W.E.Leithead

    E-Print Network [OSTI]

    Duffy, Ken

    significantly reduce the power transients at controller start-up. The relation to anti-wind-up is noted. The standard commercial design of wind turbine is a horizontal-axis grid-connected up-wind machine of wind turbines, which are presently being developed, will include large-scale designs with a rating

  10. Ris-R-1111(EN) Ultimate Loading of Wind Turbines

    E-Print Network [OSTI]

    Risø-R-1111(EN) Ultimate Loading of Wind Turbines Gunner Chr. Larsen, Knut Ronold, Hans E-R-1111(EN) 2 Abstract An extreme loading study has been conducted comprising a general wind climate analysis as well as a wind turbine reliability study. In the wind climate analysis, the distribution

  11. Nonlinear Control of a Wind Turbine Sven Creutz Thomsen

    E-Print Network [OSTI]

    ratio P e [W ] ­ Power generated by generator P r [W ] ­ Mechanical power absorbed from the wind R r [mNonlinear Control of a Wind Turbine Sven Creutz Thomsen Kongens Lyngby 2006 #12; Technical describes analysis of various nonlinear control methods for controlling a wind turbine. High speed wind

  12. Wind Farm Simulations Using a Full Rotor Model for Wind Turbines

    E-Print Network [OSTI]

    Mavripli, Dimitri J.

    Wind Farm Simulations Using a Full Rotor Model for Wind Turbines Jay Sitaraman Dimitri Mavriplis model for the wind turbines. The analysis scheme combines several technologies, viz. unstructured mesh Wind turbine aeromechanics represents a complex problem that spans several disparate spatial

  13. Response of a Vertical Axis Wind Turbine to Time Varying Wind Conditions found within the Urban

    E-Print Network [OSTI]

    Tullis, Stephen

    Response of a Vertical Axis Wind Turbine to Time Varying Wind Conditions found within the Urban, 2010 PP 389­401 389 ABSTRACT Experimental testing of a vertical axis wind turbine within the urban of the turbine. Temporal variation of the wind with respect to the direction and velocity fluctuations

  14. WIND-TUNNEL STUDY ON AERODYNAMIC PERFORMANCE OF SMALL VERTICAL-AXIS WIND TURBINES

    E-Print Network [OSTI]

    Leu, Tzong-Shyng "Jeremy"

    1 WIND-TUNNEL STUDY ON AERODYNAMIC PERFORMANCE OF SMALL VERTICAL-AXIS WIND TURBINES J. J. Miau*1 were carried out to study the aerodynamic performance of three vertical axis wind turbines (VAWTs vertical-axis wind turbines (VAWT) have attracted a great deal of attention, because of their potential

  15. Probabilistic fatigue methodology and wind turbine reliability

    SciTech Connect (OSTI)

    Lange, C.H. [Stanford Univ., CA (United States)

    1996-05-01

    Wind turbines subjected to highly irregular loadings due to wind, gravity, and gyroscopic effects are especially vulnerable to fatigue damage. The objective of this study is to develop and illustrate methods for the probabilistic analysis and design of fatigue-sensitive wind turbine components. A computer program (CYCLES) that estimates fatigue reliability of structural and mechanical components has been developed. A FORM/SORM analysis is used to compute failure probabilities and importance factors of the random variables. The limit state equation includes uncertainty in environmental loading, gross structural response, and local fatigue properties. Several techniques are shown to better study fatigue loads data. Common one-parameter models, such as the Rayleigh and exponential models are shown to produce dramatically different estimates of load distributions and fatigue damage. Improved fits may be achieved with the two-parameter Weibull model. High b values require better modeling of relatively large stress ranges; this is effectively done by matching at least two moments (Weibull) and better by matching still higher moments. For this purpose, a new, four-moment {open_quotes}generalized Weibull{close_quotes} model is introduced. Load and resistance factor design (LRFD) methodology for design against fatigue is proposed and demonstrated using data from two horizontal-axis wind turbines. To estimate fatigue damage, wind turbine blade loads have been represented by their first three statistical moments across a range of wind conditions. Based on the moments {mu}{sub 1}{hor_ellipsis}{mu}{sub 3}, new {open_quotes}quadratic Weibull{close_quotes} load distribution models are introduced. The fatigue reliability is found to be notably affected by the choice of load distribution model.

  16. Variability of wind power near Oklahoma City and implications for siting of wind turbines

    SciTech Connect (OSTI)

    Kessler, E.; Eyster, R.

    1987-09-01

    Data from five sites near Oklahoma City were examined to assess wind power availability. Wind turbines of identical manufacture were operated at three of the sites, one of which was also equipped with anemometers on a 100-ft tower. Comprehensive anemometric data were available from the other two sites. The study indicates that the average wind speed varies substantially over Oklahoma's rolling plains, which have often been nominally regarded as flat for purposes of wind power generation. Average wind differences may be as much as 5 mph at 20 ft above ground level, and 7 mph at 100 ft above ground level for elevation differences of about 200 ft above mean sea level, even in the absence of substantial features of local terrain. Local altitude above mean sea level seems to be as influential as the shape of local terrain in determining the average wind speed. The wind turbine used at a meteorologically instrumented site in the study produced the power expected from it for the wind regime in which it was situated. The observed variations of local wind imply variations in annual kWh of as much as a factor of four between identical turbines located at similar heights above ground level in shallow valleys and on hilltops or elevated extended flat areas. 17 refs., 39 figs., 11 tabs.

  17. SMART wind turbine rotor. Data analysis and conclusions

    SciTech Connect (OSTI)

    Berg, Jonathan Charles; Barone, Matthew Franklin; Yoder, Nathanael C.

    2014-01-01

    The Wind Energy Technologies department at Sandia National Laboratories has developed and field tested a wind turbine rotor with integrated trailing-edge flaps designed for active control of the rotor aerodynamics. The SMART Rotor project was funded by the Wind and Water Power Technologies Office of the U.S. Department of Energy (DOE) and was conducted to demonstrate active rotor control and evaluate simulation tools available for active control research. This report documents the data post-processing and analysis performed to date on the field test data. Results include the control capability of the trailing edge flaps, the combined structural and aerodynamic damping observed through application of step actuation with ensemble averaging, direct observation of time delays associated with aerodynamic response, and techniques for characterizing an operating turbine with active rotor control.

  18. Investigation of Various Wind Turbine Drivetrain Condition Monitoring Techniques

    SciTech Connect (OSTI)

    Sheng, S.; Oyague, F.; Butterfield, S.

    2010-08-01

    The wind industry has experienced premature turbine component failures during the past years. With the increase in turbine size, these failures, especially those found in the major drivetrain components, i.e. main shaft, gearbox, and generator, have become extremely costly. Given that the gearbox is the most costly component in the drivetrain to fix, the National Renewable Energy Laboratory (NREL) initiated the Gearbox Reliability Collaborative (GRC) to determine the causes for premature gearbox failures and subsequently, recommend improvements to gearbox design, manufacture, and operational practices. The GRC has two identical test gearboxes, which are planned for a dynamometer and a field test, respectively.

  19. Combined Experiment Phase 1. [Horizontal axis wind turbines: wind tunnel testing versus field testing

    SciTech Connect (OSTI)

    Butterfield, C.P.; Musial, W.P.; Simms, D.A.

    1992-10-01

    How does wind tunnel airfoil data differ from the airfoil performance on an operating horizontal axis wind turbine (HAWT) The National Renewable Energy laboratory has been conducting a comprehensive test program focused on answering this question and understanding the basic fluid mechanics of rotating HAWT stall aerodynamics. The basic approach was to instrument a wind rotor, using an airfoil that was well documented by wind tunnel tests, and measure operating pressure distributions on the rotating blade. Based an the integrated values of the pressure data, airfoil performance coefficients were obtained, and comparisons were made between the rotating data and the wind tunnel data. Care was taken to the aerodynamic and geometric differences between the rotating and the wind tunnel models. This is the first of two reports describing the Combined Experiment Program and its results. This Phase I report covers background information such as test setup and instrumentation. It also includes wind tunnel test results and roughness testing.

  20. NREL Controllable Grid Interface for Testing MW-Scale Wind Turbine

    Office of Scientific and Technical Information (OSTI)

    Controllable Grid Interface for Testing MW-Scale Wind Turbine Generators (Poster) McDade, M.; Gevorgian, V.; Wallen, R.; Erdman, W. 17 WIND ENERGY WIND TURBINE TESTING;...

  1. Vertical axis wind turbine acoustics

    E-Print Network [OSTI]

    Pearson, Charlie

    2014-04-08

    due to the political support for renewable energy and the introduction of Feed In Tariffs, which pay home owners for generating their own electricity. Due to their ability to respond quickly to changing wind conditions, small-scale vertical axis...

  2. Dynamic Models for Wind Turbines and Wind Power Plants

    SciTech Connect (OSTI)

    Singh, M.; Santoso, S.

    2011-10-01

    The primary objective of this report was to develop universal manufacturer-independent wind turbine and wind power plant models that can be shared, used, and improved without any restrictions by project developers, manufacturers, and engineers. Manufacturer-specific models of wind turbines are favored for use in wind power interconnection studies. While they are detailed and accurate, their usages are limited to the terms of the non-disclosure agreement, thus stifling model sharing. The primary objective of the work proposed is to develop universal manufacturer-independent wind power plant models that can be shared, used, and improved without any restrictions by project developers, manufacturers, and engineers. Each of these models includes representations of general turbine aerodynamics, the mechanical drive-train, and the electrical characteristics of the generator and converter, as well as the control systems typically used. To determine how realistic model performance is, the performance of one of the models (doubly-fed induction generator model) has been validated using real-world wind power plant data. This work also documents selected applications of these models.

  3. Aero-Structural Design Investigations for Biplane Wind Turbine Blades

    E-Print Network [OSTI]

    Roth-Johnson, Perry

    2014-01-01

    of figures Land-based and offshore wind energy resource ofFigure 1.1: Land-based and offshore wind energy resource of14] 4C Offshore, “Offshore Wind Turbine: S7.0-171, Sam- sung

  4. Understanding Trends in Wind Turbine Prices Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2012-01-01

    installed wind project costs in the U.S. fell by 14.4% onperiod, reported wind project costs in the U.S. actuallyto the average cost of wind turbines in the US through 2008.

  5. NREL Releases RFP for Distributed Wind Turbine Competitiveness Improvement Projects

    Broader source: Energy.gov [DOE]

    In support of DOE's efforts to further develop distributed wind technology, NREL's National Wind Technology Center has released a Request for Proposal for the following Distributed Wind Turbine Competitiveness Improvement Projects on the Federal Business

  6. Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    consequent impacts on wind turbine and wind energy pricing.Bloomberg NEF”). 2011c. Wind Turbine Price Index, Issue V.Understanding Trends in Wind Turbine Prices Over the Past

  7. Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    impacts on wind turbine and wind energy pricing. ReferencesProduction from a V112 Turbine Wind Plant. Prepared forBloomberg NEF”). 2011c. Wind Turbine Price Index, Issue V.

  8. Vertical-axis wind turbines -- The current status of an old technology

    SciTech Connect (OSTI)

    Berg, D.E.

    1996-12-31

    Vertical-axis wind turbine technology is not well understood, even though the earliest wind machines rotated about a vertical axis. The operating environment of a vertical-axis wind turbine is quite complex, but detailed analysis capabilities have been developed and verified over the last 30 years. Although vertical-axis technology has not been widely commercialized, it exhibits both advantages and disadvantages compared to horizontal-axis technology, and in some applications, it appears to offer significant advantages.

  9. continuum mechanics inviscid fluids Efficiency of a Wind Turbine

    E-Print Network [OSTI]

    continuum mechanics inviscid fluids Efficiency of a Wind Turbine In this problem, we will determine the maximal possible power that can be extracted from a wind turbine. We imagine the following setup. Consider a tube of cross-sectional area A, with incident gas velocity v. We place some turbine

  10. Design Loads for Wind Turbines using the Environmental Contour Method

    E-Print Network [OSTI]

    Manuel, Lance

    Design Loads for Wind Turbines using the Environmental Contour Method Korn Saranyasoontorn, TX 78712 When interest is in establishing ultimate design loads for wind turbines such that a service). The parametric conditional load distri- butions require extensive turbine response simulations over the entire

  11. Danehy Park Wind Turbine Project Preliminary Assessment Report

    E-Print Network [OSTI]

    Danehy Park Wind Turbine Project Preliminary Assessment Report Danehy Park Project Group Wind turbine. Katherine Dykes and Sungho Lee for their leadership, guidance, and feedback. #12;1 Introduction sensors were mounted is marked with a yellow star. #12;2 Turbine Evaluation Set This report evaluates

  12. Ris R1024EN Design of the Wind Turbine

    E-Print Network [OSTI]

    Ris R1024EN Design of the Wind Turbine Airfoil Family RIS AXX Kristian S. Dahl, Peter Fuglsang Ris National Laboratory, Roskilde, Denmark December 1998 #12;Abstract A method for design of wind turbine turbine. The airfoils are designed to have maximum lift-drag ratio until just below stall, a design lift

  13. Offshore Series Wind Turbine Variable Hub heights & rotor diameters

    E-Print Network [OSTI]

    Firestone, Jeremy

    3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters and providing longer turbine life GE's unique electronics provide transmission efficiencies and enable harmonious function within the local grid Allows wind turbines to stay on line generating power, even during

  14. Grid Simulator for Testing a Wind Turbine on Offshore Floating Platform

    SciTech Connect (OSTI)

    Gevorgian, V.

    2012-02-01

    An important aspect of such offshore testing of a wind turbine floating platform is electrical loading of the wind turbine generator. An option of interconnecting the floating wind turbine with the onshore grid via submarine power cable is limited by many factors such as costs and associated environmental aspects (i.e., an expensive and lengthy sea floor study is needed for cable routing, burial, etc). It appears to be a more cost effective solution to implement a standalone grid simulator on a floating platform itself for electrical loading of the test wind turbine. Such a grid simulator must create a stable fault-resilient voltage and frequency bus (a micro grid) for continuous operation of the test wind turbine. In this report, several electrical topologies for an offshore grid simulator were analyzed and modeled.

  15. Offshore Wind Turbines - Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine: Environmental Effects of Offshore Wind Energy Development

    SciTech Connect (OSTI)

    Aker, Pamela M.; Jones, Anthony M.; Copping, Andrea E.

    2010-11-23

    Deep C Wind, a consortium headed by the University of Maine will test the first U.S. offshore wind platforms in 2012. In advance of final siting and permitting of the test turbines off Monhegan Island, residents of the island off Maine require reassurance that the noise levels from the test turbines will not disturb them. Pacific Northwest National Laboratory, at the request of the University of Maine, and with the support of the U.S. Department of Energy Wind Program, modeled the acoustic output of the planned test turbines.

  16. Wind turbine reliability database update.

    SciTech Connect (OSTI)

    Peters, Valerie A.; Hill, Roger Ray; Stinebaugh, Jennifer A.; Veers, Paul S.

    2009-03-01

    This report documents the status of the Sandia National Laboratories' Wind Plant Reliability Database. Included in this report are updates on the form and contents of the Database, which stems from a fivestep process of data partnerships, data definition and transfer, data formatting and normalization, analysis, and reporting. Selected observations are also reported.

  17. NREL: Wind Research - Small Wind Turbine Development

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines lightGeospatialDevelopment of Marine andDrivetrainsNewSite Wind

  18. Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting

    E-Print Network [OSTI]

    Capps, Scott B; Zender, Charles S

    2010-01-01

    envisioned floating offshore wind turbines. Finally, global35 ] For the three turbines considered, offshore wind farmsusable wind power is evaluated for modern offshore turbine

  19. Wear Analysis of Wind Turbine Gearbox Bearings

    SciTech Connect (OSTI)

    Blau, Peter Julian; Walker, Larry R; Xu, Hanbing; Parten, Randy J; Qu, Jun; Geer, Tom

    2010-04-01

    The objective of this effort was to investigate and characterize the nature of surface damage and wear to wind turbine gearbox bearings returned from service in the field. Bearings were supplied for examination by S. Butterfield and J. Johnson of the National Wind Technology Center (NREL), Boulder, Colorado. Studies consisted of visual examination, optical and electron microscopy, dimensional measurements of wear-induced macro-scale and micro-scale features, measurements of macro- and micro-scale hardness, 3D imaging of surface damage, studies of elemental distributions on fracture surfaces, and examinations of polished cross-sections of surfaces under various etched and non-etched conditions.

  20. Westwind Wind Turbines | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OFAMERICA'SHeavyAgencyTendo New EnergyWindState GridWind Turbines Jump to:

  1. Root region airfoil for wind turbine

    DOE Patents [OSTI]

    Tangler, J.L.; Somers, D.M.

    1995-05-23

    A thick airfoil is described for the root region of the blade of a wind turbine. The airfoil has a thickness in a range from 24%--26% and a Reynolds number in a range from 1,000,000 to 1,800,000. The airfoil has a maximum lift coefficient of 1.4--1.6 that has minimum sensitivity to roughness effects. 3 Figs.

  2. EA-2004: Seneca Nation of Indians Wind Turbine Project, Cattaraugus...

    Broader source: Energy.gov (indexed) [DOE]

    funding to the Seneca Nation of Indians, to design, permit, and construct a 1.7-megawatt wind turbine on Tribal common lands in the Cattaraugus Territory, New York. The turbine...

  3. DOE Seeking Proposals to Advance Distributed Wind Turbine Technology...

    Broader source: Energy.gov (indexed) [DOE]

    Project (CIP). The CIP aims to help U.S. manufacturers of small and mid-sized wind turbines with rotor swept areas up to 1,000 square meters improve their turbine designs...

  4. NREL: Awards and Honors - North Wind 100/20 Wind Turbine

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    North Wind 10020 Wind Turbine Developers: Gerry Nix and Brian Smith, National Renewable Energy Laboratory; Johnathan Lynch, Clint Coleman, Garrett Bywaters, and Rob Roland,...

  5. Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1

    E-Print Network [OSTI]

    Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1 , Gabriele Michalke2) wind turbines address primarily the design of DFIG wind turbine control with special focus on power strategy for DFIG wind turbines, which enhances the fault ride-through capability of DFIG wind turbines

  6. Aalborg Universitet Harmonic Analysis of Offshore Wind Farms with Full Converter Wind Turbines

    E-Print Network [OSTI]

    Bak, Claus Leth

    Aalborg Universitet Harmonic Analysis of Offshore Wind Farms with Full Converter Wind Turbines Analysis of Offshore Wind Farms with Full Converter Wind Turbines. In Proceeding of the 8th International.aau.dk on: juli 06, 2015 #12; Abstract--This paper presents the harmonic analysis of offshore wind farm (OWF

  7. Power optimization of wind farms by curtailment of upwind turbines

    E-Print Network [OSTI]

    Power optimization of wind farms by curtailment of upwind turbines Simon Kirkeby Wessel Kongens is shown to increase the total power production of wind farms of dierent size and shape. Several methods by curtailing upwind turbines. It is shown that the annual power production for a square wind farm consisting

  8. Wind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation

    E-Print Network [OSTI]

    Wind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation Clemens Jauch Risø National Laboratory Wind Energy Department P.O. Box 49 DK-4000 Roskilde, Denmark clemens.jauch@risoe.dk Abstract: In this paper it is investigated how active-stall wind turbines can contribute to the stabilisation of the power

  9. Offshore Series Wind Turbine Variable Hub heights & rotor diameters

    E-Print Network [OSTI]

    Firestone, Jeremy

    3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters-savings feature, considering the rigors of offshore power generation. The 3.6 MW offshore wind turbine also, for both on and offshore use. Special features include... As the world's first commercially available wind

  10. Wave Models for Offshore Wind Turbines Puneet Agarwal

    E-Print Network [OSTI]

    Manuel, Lance

    Wave Models for Offshore Wind Turbines Puneet Agarwal§ and Lance Manuely Department of Civil. These wave modeling assumptions do not adequately represent waves in shallow waters where most offshore wind for estimating loads on the support structure (monopile) of an offshore wind turbine. We use a 5MW utility

  11. Extreme Loads for an Offshore Wind Turbine using Statistical

    E-Print Network [OSTI]

    Manuel, Lance

    Extreme Loads for an Offshore Wind Turbine using Statistical Extrapolation from Limited Field Data,itiscommontoeithercarry out extensive simulation studies or undertake a field measurement campaign. At the Blyth offshore wind here is to estimate extreme loads for an offshore wind turbine for which the environmental and load

  12. Structural Monitoring of Wind Turbines using Wireless Sensor Networks

    E-Print Network [OSTI]

    Sweetman, Bert

    1 Structural Monitoring of Wind Turbines using Wireless Sensor Networks R. Andrew Swartz1 , Jerome becomes more critical. Wind power has tremendous potential to provide renewable energy without reliance on traditional fossil fuel technologies. Conditional monitoring of wind turbines can help to avert unplanned

  13. Structural Monitoring of Wind Turbines using Wireless Sensor Networks

    E-Print Network [OSTI]

    Lynch, Jerome P.

    1 Structural Monitoring of Wind Turbines using Wireless Sensor Networks R. Andrew Swartz1, Jerome P becomes more critical. Wind power has tremendous potential to provide renewable energy without reliance on traditional fossil fuel technologies. Conditional monitoring of wind turbines can help to avert unplanned

  14. The Effect of Wind Speed and Electric Rates On Wind Turbine Economics

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    The Effect of Wind Speed and Electric Rates On Wind Turbine Economics Economics of wind power by the theoretical maximum energy production if the generator were running at its rated power all the year turbine Rated Power per turbine: assumption 1,500 kW C Availability assumption 97% D 8,760 hrs/year E

  15. 2/16/2014 Can You Charge Your Mobile With Wind Turbine? -TechTxr http://www.techtxr.com/can-charge-mobile-wind-turbine/ 1/7

    E-Print Network [OSTI]

    Chiao, Jung-Chih

    Turbine? | February 9, 2014 Wind Energy Wind Mill Wind Power Wind Mobile About Wind Power Wind2/16/2014 Can You Charge Your Mobile With Wind Turbine? - TechTxr http://www.techtxr.com/can-charge-mobile-wind News Gaming Consoles Enter Search Terms search Navigate to ... Can You Charge Your Mobile With Wind

  16. Plasma Aerodynamic Control Effectors for Improved Wind Turbine Performance

    SciTech Connect (OSTI)

    Mehul P. Patel; Srikanth Vasudevan; Robert C. Nelson; Thomas C. Corke

    2008-08-01

    Orbital Research Inc is developing an innovative Plasma Aerodynamic Control Effectors (PACE) technology for improved performance of wind turbines. The PACE system is aimed towards the design of "smart" rotor blades to enhance energy capture and reduce aerodynamic loading and noise using flow-control. The PACE system will provide ability to change aerodynamic loads and pitch distribution across the wind turbine blade without any moving surfaces. Additional benefits of the PACE system include reduced blade structure weight and complexity that should translate into a substantially reduced initial cost. During the Phase I program, the ORI-UND Team demonstrated (proof-of-concept) performance improvements on select rotor blade designs using PACE concepts. Control of both 2-D and 3-D flows were demonstrated. An analytical study was conducted to estimate control requirements for the PACE system to maintain control during wind gusts. Finally, independent laboratory experiments were conducted to identify promising dielectric materials for the plasma actuator, and to examine environmental effects (water and dust) on the plasma actuator operation. The proposed PACE system will be capable of capturing additional energy, and reducing aerodynamic loading and noise on wind turbines. Supplementary benefits from the PACE system include reduced blade structure weight and complexity that translates into reduced initial capital costs.

  17. Published in Proceedings of the XL2003 (Response of Structures to Extreme Loading) Conference, Toronto, August 2003. EFFICIENT MODELS FOR WIND TURBINE EXTREME LOADS

    E-Print Network [OSTI]

    Manuel, Lance

    , Toronto, August 2003. EFFICIENT MODELS FOR WIND TURBINE EXTREME LOADS USING INVERSE RELIABILITY K, USA ABSTRACT The reliability of wind turbines against extreme loads is the focus of this study loads for a 600kW three-bladed horizontal-axis wind turbine. Only operating loads ­ here, flapwise (out

  18. ACOUSTIC STUDY OF THE UD / GAMESA WIND TURBINE PROJECT

    E-Print Network [OSTI]

    Firestone, Jeremy

    /s). Maximum sound power is first produced by the wind turbine at the design wind speed. The study at or above 4.2 m/s) and 108.4 dBA for the design wind condition (hub height winds at or above 9.7 m average sound levels are in the range of 34 to 56 dBA. · The maximum wind turbine sound level under design

  19. Superconductivity for Large Scale Wind Turbines

    SciTech Connect (OSTI)

    R. Fair; W. Stautner; M. Douglass; R. Rajput-Ghoshal; M. Moscinski; P. Riley; D. Wagner; J. Kim; S. Hou; F. Lopez; K. Haran; J. Bray; T. Laskaris; J. Rochford; R. Duckworth

    2012-10-12

    A conceptual design has been completed for a 10MW superconducting direct drive wind turbine generator employing low temperature superconductors for the field winding. Key technology building blocks from the GE Wind and GE Healthcare businesses have been transferred across to the design of this concept machine. Wherever possible, conventional technology and production techniques have been used in order to support the case for commercialization of such a machine. Appendices A and B provide further details of the layout of the machine and the complete specification table for the concept design. Phase 1 of the program has allowed us to understand the trade-offs between the various sub-systems of such a generator and its integration with a wind turbine. A Failure Modes and Effects Analysis (FMEA) and a Technology Readiness Level (TRL) analysis have been completed resulting in the identification of high risk components within the design. The design has been analyzed from a commercial and economic point of view and Cost of Energy (COE) calculations have been carried out with the potential to reduce COE by up to 18% when compared with a permanent magnet direct drive 5MW baseline machine, resulting in a potential COE of 0.075 $/kWh. Finally, a top-level commercialization plan has been proposed to enable this technology to be transitioned to full volume production. The main body of this report will present the design processes employed and the main findings and conclusions.

  20. User's manual for the vertical axis wind turbine performance...

    Office of Scientific and Technical Information (OSTI)

    Technical Report: User's manual for the vertical axis wind turbine performance computer code darter Citation Details In-Document Search Title: User's manual for the vertical axis...

  1. Statistics Show Bearing Problems Cause the Majority of Wind Turbine...

    Broader source: Energy.gov (indexed) [DOE]

    database. According to the latest statistics from the database, the majority of wind turbine gearbox failures (76%) are caused by the bearings. Axial cracks that form on...

  2. Sandia Energy - Senator Bingaman Tells Sandia Wind Turbine Blade...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    turbine design, blade and rotor testing, manufacturing and inspection, distributed wind technology, and water power. Bingaman said a diversity of U.S. energy sources at a...

  3. United States Launches First Grid-Connected Offshore Wind Turbine...

    Broader source: Energy.gov (indexed) [DOE]

    an EERE investment, the University of Maine deployed the nation's first grid-connected offshore floating wind turbine prototype off the coast of Castine, Maine. The university...

  4. Supercomputer Helps Design Wind Turbines | ornl.gov

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Ridge National Laboratory have been researching, developing and testing materials in freezing conditions. By developing more efficient materials for wind turbines, researchers can...

  5. Wind Turbine Interactions with Birds, Bats, and their Habitats...

    Office of Environmental Management (EM)

    Birds, Bats, and their Habitats: A Summary of Research Results and Priority Questions Wind Turbine Interactions with Birds, Bats, and their Habitats: A Summary of Research...

  6. Barr Engineering Statement of Methodology Rosemount Wind Turbine...

    Energy Savers [EERE]

    Barr Engineering Statement of Methodology Rosemount Wind Turbine Simulations by Truescape Visual Reality, DOEEA-1791 (May 2010) Barr Engineering Statement of Methodology Rosemount...

  7. WINDExchange Webinar: Small and Distributed Wind Turbine Update

    Broader source: Energy.gov [DOE]

    Save the date for this free webinar presenting an overview of recent news and updates pertaining to small and distributed wind turbines.

  8. Wind Turbine Pitch Optimization Benjamin Biegel Morten Juelsgaard Matt Kraning Stephen Boyd Jakob Stoustrup

    E-Print Network [OSTI]

    Wind Turbine Pitch Optimization Benjamin Biegel Morten Juelsgaard Matt Kraning Stephen Boyd Jakob-controlled wind tur- bine. When placed in a wind field, the turbine experiences several mechanical loads, which measurements, with no knowledge of the wind field or wind turbine model. I. INTRODUCTION Wind turbines

  9. IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines

    E-Print Network [OSTI]

    Tullis, Stephen

    IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines (VAWT) is being studied at McMaster University using(VAWT) is being studied at McMaster University using a prototype wind turbine provided bya prototype wind turbine provided

  10. Dynamic response analysis of a 900 kW wind turbine subject to ground excitation

    E-Print Network [OSTI]

    Caudillo, Adrian Felix

    2012-01-01

    Simulations of Wind Turbine Dynamics Including Soil-Modeling the Wind Turbine . . . . . . . . . . . . 5.2.2 SoilFigure 5.3: A “wind turbine” built in a modified version of

  11. Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    movements inflating the cost of wind turbines imported intoto the average cost of wind turbines in the US through 2008.specific focus on the cost of wind turbines deployed onshore

  12. Impacts of Providing Inertial Response on Dynamic Loads of Wind Turbine Drivetrains: Preprint

    SciTech Connect (OSTI)

    Girsang, I. P.; Dhupia, J.; Singh, M.; Gevorgian, V.; Muljadi, E.; Jonkman, J.

    2014-09-01

    There has been growing demand from the power industry for wind power plants to support power system operations. One such requirement is for wind turbines to provide ancillary services in the form of inertial response. When the grid frequency drops, it is essential for wind turbine generators (WTGs) to inject kinetic energy stored in their inertia into the grid to help arrest the frequency decline. However, the impacts of inertial response on the structural loads of the wind turbine have not been given much attention. To bridge this gap, this paper utilizes a holistic model for both fixed-speed and variable-speed WTGs by integrating the aeroelastic wind turbine model in FAST, developed by the National Renewable Energy Laboratory, with the electromechanical drivetrain model in SimDriveline and SimPowerSystems.

  13. Final Technical Report Recovery Act: Online Nonintrusive Condition Monitoring and Fault Detection for Wind Turbines

    SciTech Connect (OSTI)

    Wei Qiao

    2012-05-29

    The penetration of wind power has increased greatly over the last decade in the United States and across the world. The U.S. wind power industry installed 1,118 MW of new capacity in the first quarter of 2011 alone and entered the second quarter with another 5,600 MW under construction. By 2030, wind energy is expected to provide 20% of the U.S. electricity needs. As the number of wind turbines continues to grow, the need for effective condition monitoring and fault detection (CMFD) systems becomes increasingly important [3]. Online CMFD is an effective means of not only improving the reliability, capacity factor, and lifetime, but it also reduces the downtime, energy loss, and operation and maintenance (O&M) of wind turbines. The goal of this project is to develop novel online nonintrusive CMFD technologies for wind turbines. The proposed technologies use only the current measurements that have been used by the control and protection system of a wind turbine generator (WTG); no additional sensors or data acquisition devices are needed. Current signals are reliable and easily accessible from the ground without intruding on the wind turbine generators (WTGs) that are situated on high towers and installed in remote areas. Therefore, current-based CMFD techniques have great economic benefits and the potential to be adopted by the wind energy industry. Specifically, the following objectives and results have been achieved in this project: (1) Analyzed the effects of faults in a WTG on the generator currents of the WTG operating at variable rotating speed conditions from the perspective of amplitude and frequency modulations of the current measurements; (2) Developed effective amplitude and frequency demodulation methods for appropriate signal conditioning of the current measurements to improve the accuracy and reliability of wind turbine CMFD; (3) Developed a 1P-invariant power spectrum density (PSD) method for effective signature extraction of wind turbine faults with characteristic frequencies in the current or current demodulated signals, where 1P stands for the shaft rotating frequency of a WTG; (4) Developed a wavelet filter for effective signature extraction of wind turbine faults without characteristic frequencies in the current or current demodulated signals; (5) Developed an effective adaptive noise cancellation method as an alternative to the wavelet filter method for signature extraction of wind turbine faults without characteristic frequencies in the current or current demodulated signals; (6) Developed a statistical analysis-based impulse detection method for effective fault signature extraction and evaluation of WTGs based on the 1P-invariant PSD of the current or current demodulated signals; (7) Validated the proposed current-based wind turbine CMFD technologies through extensive computer simulations and experiments for small direct-drive WTGs without gearboxes; and (8) Showed, through extensive experiments for small direct-drive WTGs, that the performance of the proposed current-based wind turbine CMFD technologies is comparable to traditional vibration-based methods. The proposed technologies have been successfully applied for detection of major failures in blades, shafts, bearings, and generators of small direct-drive WTGs. The proposed technologies can be easily integrated into existing wind turbine control, protection, and monitoring systems and can be implemented remotely from the wind turbines being monitored. The proposed technologies provide an alternative to vibration-sensor-based CMFD. This will reduce the cost and hardware complexity of wind turbine CMFD systems. The proposed technologies can also be combined with vibration-sensor-based methods to improve the accuracy and reliability of wind turbine CMFD systems. When there are problems with sensors, the proposed technologies will ensure proper CMFD for the wind turbines, including their sensing systems. In conclusion, the proposed technologies offer an effective means to achieve condition-based smart maintenance for wind turbines and have a gre

  14. Wind Turbine Gearbox Oil Filtration and Condition Monitoring

    SciTech Connect (OSTI)

    Sheng, Shuangwen

    2015-10-25

    This is an invited presentation for a pre-conference workshop, titled advances and opportunities in lubrication: wind turbine, at the 2015 Society of Tribologists and Lubrication Engineers (STLE) Tribology Frontiers Conference held in Denver, CO. It gives a brief overview of wind turbine gearbox oil filtration and condition monitoring by highlighting typical industry practices and challenges. The presentation starts with an introduction by covering recent growth of global wind industry, reliability challenges, benefits of oil filtration and condition monitoring, and financial incentives to conduct wind operation and maintenance research, which includes gearbox oil filtration and condition monitoring work presented herein. Then, the presentation moves on to oil filtration by stressing the benefits of filtration, discussing typical main- and offline-loop practices, highlighting important factors considered when specifying a filtration system, and illustrating real-world application challenges through a cold-start example. In the next section on oil condition monitoring, a discussion on oil sample analysis, oil debris monitoring, oil cleanliness measurements and filter analysis is given based on testing results mostly obtained by and at NREL, and by pointing out a few challenges with oil sample analysis. The presentation concludes with a brief touch on future research and development (R and D) opportunities. It is hoping that the information presented can inform the STLE community to start or redirect their R and D work to help the wind industry advance.

  15. Aero-Structural Design Investigations for Biplane Wind Turbine Blades

    E-Print Network [OSTI]

    Roth-Johnson, Perry

    2014-01-01

    3 Aero-structural investigation of biplane wind turbine5 Aero-structural analysis of a full 100-meter biplane windP. Roth-Johnson, R. Wirz, “Aero-structural investigation of

  16. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    N. A. (2002). “Design challenges in international wind powerN. A. (2002). “Design challenges in international wind powerwind into electrical power. Early turbines explored many di?erent design

  17. Utility-Scale Wind Turbines | Open Energy Information

    Open Energy Info (EERE)

    turbines as greater than 1 megawatt. This technology class includes land-based and offshore wind projects. 1 Learn more about utility-scale wind at the links below....

  18. Aero-Structural Design Investigations for Biplane Wind Turbine Blades

    E-Print Network [OSTI]

    Roth-Johnson, Perry

    2014-01-01

    of figures Land-based and offshore wind energy resource ofsamsung-s7.0-171, 2012. Accessed: [14] 4C Offshore, “Offshore Wind Turbine: S7.0-171, Sam- sung Heavy

  19. Wind Turbine Towers Establish New Height Standards and Reduce...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    enabled Wind Tower Systems to develop the Space Frame tower, a new concept for wind turbine towers. Instead of a solid steel tube, the Space Frame tower consists of a highly...

  20. Lessons Learned: Milwaukee’s Wind Turbine Project

    Office of Energy Efficiency and Renewable Energy (EERE)

    U.S. Department of Energy Community and Renewable Energy Success Stories webinar series titled Wind Energy in Urban Environments. This presentation describes a mid-size wind turbine installation near downtown Milwaukee, Wisconsin.

  1. New IRS Rules for Small and Medium Wind Turbines

    Broader source: Energy.gov [DOE]

    The Small Wind Certification Council (SWCC) will host a webinar on how certification is being used to meet the new Internal Revenue Service (IRS) requirements for small and medium wind turbines...

  2. Rotationally sampled wind characteristics and correlations with MOD-OA wind turbine response

    SciTech Connect (OSTI)

    George, R.L.; Connell, J.R.

    1984-09-01

    This report presents results of a comprehensive wind and wind turbine measurement program: the Clayton, New Mexico, vertical plane array/MOD-OA project. In this experiment, the turbulent wind was measured for a large array of fixed anemometers located two blade diameters upwind of a 200-kW horizontal-axis wind turbine (HAWT). Simultaneously, key wind turbine response parameters were also measured. The first of two major objectives of this experiment was to determine the turbulent wind, rotationally sampled to emulate the motion of the wind turbine blade, for the range of different wind speeds and stability classes actually experienced by the wind turbine. The second major objective was to correlate this rotationally sampled wind with the wind turbine blade stress and power, in order to assess the usefulness of the wind measurements for wind turbine loads testing a prediction. Time series of rotationally sampled winds and wind turbine blade bending moments and power were converted to frequency spectra using Fourier transform techniques. These spectra were used as the basis for both qualitative and quantitative comparisons among the various cases. A quantitative comparison between the rotationally sampled wind input and blade bending response was made, using the Fourier spectra to estimate the blade transfer function. These transfer functions were then used to calculate an approximate damping coefficient for the MOD-OA fiberglass blade.

  3. NREL Software Aids Offshore Wind Turbine Designs (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2013-10-01

    NREL researchers are supporting offshore wind power development with computer models that allow detailed analyses of both fixed and floating offshore wind turbines. While existing computer-aided engineering (CAE) models can simulate the conditions and stresses that a land-based wind turbine experiences over its lifetime, offshore turbines require the additional considerations of variations in water depth, soil type, and wind and wave severity, which also necessitate the use of a variety of support-structure types. NREL's core wind CAE tool, FAST, models the additional effects of incident waves, sea currents, and the foundation dynamics of the support structures.

  4. Multi-piece wind turbine rotor blades and wind turbines incorporating same

    DOE Patents [OSTI]

    Moroz; Emilian Mieczyslaw (San Diego, CA) [San Diego, CA

    2008-06-03

    A multisection blade for a wind turbine includes a hub extender having a pitch bearing at one end, a skirt or fairing having a hole therethrough and configured to mount over the hub extender, and an outboard section configured to couple to the pitch bearing.

  5. Technical Assessment for the CPC FD-7x-1500 Wind Turbine located at Tooele Army Base, Tooele Utah

    SciTech Connect (OSTI)

    Robert J. Turk; Kurt S. Myers; Jason W. Bush

    2012-08-01

    The CPC FD-7x-1500 Wind Turbine was installed with funding from the Energy Conservation Investment Program (ECIP). Since its installation, the turbine has been plagued with multiple operational upsets causing unacceptable down time. In an effort to reduce down time, the Army Corps of Engineers requested the Idaho National Laboratory conduct an assessment of the turbine to determine its viability as an operational turbine.

  6. Wind turbine ring/shroud drive system

    DOE Patents [OSTI]

    Blakemore, Ralph W.

    2005-10-04

    A wind turbine capable of driving multiple electric generators having a ring or shroud structure for reducing blade root bending moments, hub loads, blade fastener loads and pitch bearing loads. The shroud may further incorporate a ring gear for driving an electric generator. In one embodiment, the electric generator may be cantilevered from the nacelle such that the gear on the generator drive shaft is contacted by the ring gear of the shroud. The shroud also provides protection for the gearing and aids in preventing gear lubricant contamination.

  7. Applied Materials Wind Turbine | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoop IncIowaWisconsin: EnergyYork Jump| OpenExploration At TheWind Turbine Jump to:

  8. Jet spoiler arrangement for wind turbine (Patent) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Patent: Jet spoiler arrangement for wind turbine Citation Details In-Document Search Title: Jet spoiler arrangement for wind turbine An air jet spoiler arrangement is provided for...

  9. Future of Condition Monitoring for Wind Turbines | OpenEI Community

    Open Energy Info (EERE)

    Future of Condition Monitoring for Wind Turbines > Posts by term > Future of Condition Monitoring for Wind Turbines Content Group Activity By term Q & A Feeds Term: Floating...

  10. Wind Turbine Blade Flow Fields and Prospects for Active Aerodynamic Control: Preprint

    SciTech Connect (OSTI)

    Schreck, S.; Robinson, M.

    2007-08-01

    This paper describes wind turbine flow fields that can cause adverse aerodynamic loading and can impact active aerodynamic control methodologies currently contemplated for wind turbine applications.

  11. Testing and Modeling of a 3-MW Wind Turbine Using Fully Coupled Simulation Codes (Poster)

    SciTech Connect (OSTI)

    LaCava, W.; Guo, Y.; Van Dam, J.; Bergua, R.; Casanovas, C.; Cugat, C.

    2012-06-01

    This poster describes the NREL/Alstom Wind testing and model verification of the Alstom 3-MW wind turbine located at NREL's National Wind Technology Center. NREL,in collaboration with ALSTOM Wind, is studying a 3-MW wind turbine installed at the National Wind Technology Center(NWTC). The project analyzes the turbine design using a state-of-the-art simulation code validated with detailed test data. This poster describes the testing and the model validation effort, and provides conclusions about the performance of the unique drive train configuration used in this wind turbine. The 3-MW machine has been operating at the NWTC since March 2011, and drive train measurements will be collected through the spring of 2012. The NWTC testing site has particularly turbulent wind patterns that allow for the measurement of large transient loads and the resulting turbine response. This poster describes the 3-MW turbine test project, the instrumentation installed, and the load cases captured. The design of a reliable wind turbine drive train increasingly relies on the use of advanced simulation to predict structural responses in a varying wind field. This poster presents a fully coupled, aero-elastic and dynamic model of the wind turbine. It also shows the methodology used to validate the model, including the use of measured tower modes, model-to-model comparisons of the power curve, and mainshaft bending predictions for various load cases. The drivetrain is designed to only transmit torque to the gearbox, eliminating non-torque moments that are known to cause gear misalignment. Preliminary results show that the drivetrain is able to divert bending loads in extreme loading cases, and that a significantly smaller bending moment is induced on the mainshaft compared to a three-point mounting design.

  12. Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    A. Zervos. 2011a. “Wind Energy. ” In IPCC Special Report onconsequent impacts on wind turbine and wind energy pricing.References American Wind Energy Association (AWEA). 2011.

  13. Control of Wind Turbines for Power Regulation and

    E-Print Network [OSTI]

    Control of Wind Turbines for Power Regulation and Load Reduction Juan Jose Garcia Quirante Kongens@imm.dtu.dk www.imm.dtu.dk #12;#12;#12;Abstract This thesis describes the design of controllers for power regulation and load reduction and their ensemble in a variable-speed wind turbine. The power regulation

  14. A Simplified Morphing Blade for Horizontal Axis Wind Turbines

    E-Print Network [OSTI]

    Recanati, Catherine

    by adjusting the twist of the blade's root and tip. To evaluate the performance of wind turbine blades of the NREL Phase VI wind turbine is taken as a reference blade and has a fixed pitch. The optimization was evalu- ated for three types of blade, namely, morphing blade, blade with pitch control and fixed pitch

  15. Optimization of a Small Passive Wind Turbine Generator with Multiobjective Genetic Algorithms

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    : Multiobjective Optimization, Genetic Algorithms, Wind Energy, Vertical Axis Wind Turbine hal-00763673,version1 #12;2.2. The Wind Turbine Characteristics A Savonius Vertical Axis Wind Turbine of radius R = 0.5 mOptimization of a Small Passive Wind Turbine Generator with Multiobjective Genetic Algorithms A

  16. Influence of wind characteristics on turbine performance Ioannis Antoniou (1)

    E-Print Network [OSTI]

    Influence of wind characteristics on turbine performance Ioannis Antoniou (1) , Rozenn Wagner (1 (2) , Peder Enevoldsen (2) , Leo Thesbjerg (3) (1): Wind Energy Department, Risø): Siemens Wind Power (3): Vestas Wind Systems A/S Summary The uncertainty of power performance measurements

  17. Duration Test Report for the Ventera VT10 Wind Turbine

    SciTech Connect (OSTI)

    Smith, J.; Huskey, A.; Jager, D.; Hur, J.

    2013-06-01

    This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small wind turbines. Five turbines were tested at the National Wind Technology Center (NWTC) at the National Renewable Energy Laboratory (NREL) as a part of round one of this project. Duration testing is one of up to five tests that may be performed on the turbines, including power performance, safety and function, noise, and power quality. Test results will provide manufacturers with reports that can be used to fulfill part of the requirements for small wind turbine certification. The test equipment included a grid-connected Ventera Energy Corporation VT10 wind turbine mounted on an 18.3-m (60-ft) self-supporting lattice tower manufactured by Rohn.

  18. Understanding Trends in Wind Turbine Prices Over the Past Decade

    SciTech Connect (OSTI)

    Bolinger, Mark; Wiser, Ryan

    2011-10-26

    Taking a bottom-up approach, this report examines seven primary drivers of wind turbine prices in the United States, with the goal of estimating the degree to which each contributed to the doubling in turbine prices from 2002 through 2008, as well as the subsequent decline in prices through 2010 (our analysis does not extend into 2011 because several of these drivers are best gauged on a full-year basis due to seasonality issues). The first four of these drivers can be considered, at least to some degree, endogenous influences – i.e., those that are largely within the control of the wind industry – and include changes in: 1) Labor costs, which have historically risen during times of tight turbine supply; 2) Warranty provisions, which reflect technology performance and reliability, and are most often capitalized in turbine prices; 3) Turbine manufacturer profitability, which can impact turbine prices independently of costs; and 4) Turbine design, which for the purpose of this analysis is principally manifested through increased turbine size. The other three drivers analyzed in this study can be considered exogenous influences, in that they can impact wind turbine costs but fall mostly outside of the direct control of the wind industry. These exogenous drivers include changes in: 5) Raw materials prices, which affect the cost of inputs to the manufacturing process; 6) Energy prices, which impact the cost of manufacturing and transporting turbines; and 7) Foreign exchange rates, which can impact the dollar amount paid for turbines and components imported into the United States.

  19. Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting

    E-Print Network [OSTI]

    Capps, Scott B; Zender, Charles S

    2010-01-01

    multi?megawatt wind turbine, Renewable Energy, Matthews, J.wind turbines in Europe and North America, Renewable Energy,wind power poten- tial on Hong Kong islands—An analysis of wind power and wind turbine characteristics, Renewable Energy,

  20. Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    Dissecting Wind Turbine Costs. ” WindStats Newsletter, vol.A. Laxson. 2006. Wind Turbine Design Cost and Scaling Model.driven down wind energy costs (for a brief survey of the

  1. Intimate Emptiness: The Flint Hills Wind Turbine Controversy

    E-Print Network [OSTI]

    Graham, Howard Russell

    2008-07-28

    wind turbine sites across the state. 21 In 2000, wind research revealed that the ?Sunflower State ranked near the top in the country for wind-energy potential;? 22 in 2001, the Montezuma Project in Gray County, near Dodge City, Kansas? first wind..., and their argument. My first chapter locates the Flint Hills, explains why they are unique, discovers the reason wind developers wanted to site turbines in the Hills, and introduces the wind controversy. I draw on a number of secondary sources to help position...

  2. CgWind: A high-order accurate simulation tool for wind turbines and wind farms

    SciTech Connect (OSTI)

    Chand, K K; Henshaw, W D; Lundquist, K A; Singer, M A

    2010-02-22

    CgWind is a high-fidelity large eddy simulation (LES) tool designed to meet the modeling needs of wind turbine and wind park engineers. This tool combines several advanced computational technologies in order to model accurately the complex and dynamic nature of wind energy applications. The composite grid approach provides high-quality structured grids for the efficient implementation of high-order accurate discretizations of the incompressible Navier-Stokes equations. Composite grids also provide a natural mechanism for modeling bodies in relative motion and complex geometry. Advanced algorithms such as matrix-free multigrid, compact discretizations and approximate factorization will allow CgWind to perform highly resolved calculations efficiently on a wide class of computing resources. Also in development are nonlinear LES subgrid-scale models required to simulate the many interacting scales present in large wind turbine applications. This paper outlines our approach, the current status of CgWind and future development plans.

  3. A Computational Framework for Life-Cycle Management of Wind Turbines incorporating Structural Health Monitoring

    E-Print Network [OSTI]

    Stanford University

    , the worldwide clean energy investments, having more than doubled in the past five years, have reached a new portion is due to maintenance and operation of wind energy systems. Cost-efficient maintenance of wind turbines and reducing the life-cycle costs significantly. This paper presents a life

  4. Lifting system and apparatus for constructing wind turbine towers

    DOE Patents [OSTI]

    Livingston, Tracy; Schrader, Terry; Goldhardt, James; Lott, James

    2011-02-01

    The disclosed invention is utilized for mounting a wind turbine and blade assembly on the upper end of a wind turbine tower. The invention generally includes a frame or truss that is pivotally secured to the top bay assembly of the tower. A transverse beam is connected to the frame or truss and extends fore of the tower when the frame or truss is in a first position and generally above the tower when in a second position. When in the first position, a wind turbine or blade assembly can be hoisted to the top of the tower. The wind turbine or blade assembly is then moved into position for mounting to the tower as the frame or truss is pivoted to a second position. When the turbine and blade assembly are secured to the tower, the frame or truss is disconnected from the tower and lowered to the ground.

  5. Safety and Function Test Report for the SWIFT Wind Turbine

    SciTech Connect (OSTI)

    Mendoza, I.; Hur, J.

    2013-01-01

    This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. Three turbines where selected for testing at the National Wind Technology Center (NWTC) as a part of round two of the Small Wind Turbine Independent Testing project. Safety and Function testing is one of up to 5 tests that may be performed on the turbines. Other tests include power performance, duration, noise, and power quality. The results of the testing will provide the manufacturers with reports that may be used for small wind turbine certification.

  6. Duration Test Report for the SWIFT Wind Turbine

    SciTech Connect (OSTI)

    Mendoza, I.; Hur, J.

    2013-01-01

    This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. Three turbines where selected for testing at the National Wind Technology Center (NWTC) as a part of round two of the Small Wind Turbine Independent Testing project. Duration testing is one of up to 5 tests that may be performed on the turbines. Other tests include power performance, safety and function, noise, and power quality. The results of the testing will provide the manufacturers with reports that may be used for small wind turbine certification.

  7. WIND TURBINE DRIVETRAIN TEST FACILITY DATA ACQUISITION SYSTEM

    SciTech Connect (OSTI)

    Mcintosh, J.

    2012-01-03

    The Wind Turbine Drivetrain Test Facility (WTDTF) is a state-of-the-art industrial facility used for testing wind turbine drivetrains and generators. Large power output wind turbines are primarily installed for off-shore wind power generation. The facility includes two test bays: one to accommodate turbine nacelles up to 7.5 MW and one for nacelles up to 15 MW. For each test bay, an independent data acquisition system (DAS) records signals from various sensors required for turbine testing. These signals include resistance temperature devices, current and voltage sensors, bridge/strain gauge transducers, charge amplifiers, and accelerometers. Each WTDTF DAS also interfaces with the drivetrain load applicator control system, electrical grid monitoring system and vibration analysis system.

  8. PHYSICAL REVIEW E 88, 042146 (2013) Uncovering wind turbine properties through two-dimensional stochastic modeling of wind dynamics

    E-Print Network [OSTI]

    Peinke, Joachim

    2013-01-01

    PHYSICAL REVIEW E 88, 042146 (2013) Uncovering wind turbine properties through two, such as the rated speed of the wind turbine or the descriptive wind speed statistics, can be related to the equations describing the evolution of power production and wind speed at single wind turbines. DOI: 10

  9. FATIGUE RESISTANT FIBERGLASS LAMINATES FOR WIND TURBINE BLADES (published for Wind Energy 1996, ASME, pp. 46-51)

    E-Print Network [OSTI]

    FATIGUE RESISTANT FIBERGLASS LAMINATES FOR WIND TURBINE BLADES (published for Wind Energy 1996/MSU database to lifetime prediction as described in Ref. [1]. INTRODUCTION Most U.S. fiberglass wind turbine

  10. "Comparative Environmental Assessment of Conventional Materials and Wood for the Fabrication of Wind Turbine Blades"

    E-Print Network [OSTI]

    Mountziaris, T. J.

    of Wind Turbine Blades" Yashira M. Valentín Feliciano Mentor: Peggi Clouston Graduate Student: Rachel Koh of the turbine blades. Wind turbine blades are commonly made of carbon fiber and fiberglass, which are materials wind energy demands, wood is being evaluated for incorporation into wind turbine blades, since

  11. Infrasound, the Ear and Wind Turbines Alec N. Salt, Ph.D.

    E-Print Network [OSTI]

    Salt, Alec N.

    Infrasound, the Ear and Wind Turbines Alec N. Salt, Ph.D. Department of Otolaryngology there happens to be a castle nearby). #12;Wind turbines haveWind turbines have been getting biggerbeen getting MegaWatts(MW) Total Installed Change by year 3% of US Energy Needs Wind turbines are "green" and are

  12. The Potential Health Impact of Wind Turbines Chief Medical Officer of Health (CMOH) Report

    E-Print Network [OSTI]

    Firestone, Jeremy

    The Potential Health Impact of Wind Turbines Chief Medical Officer of Health (CMOH) Report May 2010) of Ontario in response to public health concerns about wind turbines, particularly related to noise. Assisted by wind turbines. The review concludes that while some people living near wind turbines report symptoms

  13. Can Wind Turbines be Bad for You? Alec N. Salt, Ph.D.

    E-Print Network [OSTI]

    Salt, Alec N.

    Can Wind Turbines be Bad for You? Alec N. Salt, Ph.D. Department of Otolaryngology there happens to be a castle nearby). #12;Wind turbines haveWind turbines have been getting biggerbeen getting MegaWatts(MW) Total Installed Change by year 3% of US Energy Needs Wind turbines are "green" and are

  14. Design, Analysis, and Learning Control of a Fully Actuated Micro Wind Turbine

    E-Print Network [OSTI]

    Tedrake, Russ

    Design, Analysis, and Learning Control of a Fully Actuated Micro Wind Turbine J. Zico Kolter of renewable energy, and improvements to wind turbine design and control can have a significant impact a actuated micro wind turbine intended for research purposes. While most academic work on wind turbine

  15. 58:164 Fundamentals of Wind Turbines (ME:4164:0001)

    E-Print Network [OSTI]

    Kusiak, Andrew

    58:164 ­ Fundamentals of Wind Turbines (ME:4164:0001) Syllabus P. Barry Butler 111 Jessup Hall The University of Iowa Iowa City, IA January, 2012 #12;2 Spring 2012 58:164 ­ Fundamentals of Wind Turbines mechanics and mechanical systems to wind turbine engineering. Fundamentals of horizontal-axis wind turbines

  16. Simulation of large-amplitude motion of floating wind turbines using conservation of momentum

    E-Print Network [OSTI]

    Sweetman, Bert

    Simulation of large-amplitude motion of floating wind turbines using conservation of momentum Lei equations of motion (EOMs) of a floating wind turbine system using the theorem of conservation of angular wind turbine dynamics software FAST. The concept of highly compliant floating wind turbines

  17. Wind turbine rotor hub and teeter joint

    DOE Patents [OSTI]

    Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT); Jankowski, Joseph (Stowe, VT)

    1994-10-11

    A rotor hub is provided for coupling a wind turbine rotor blade and a shaft. The hub has a yoke with a body which is connected to the shaft, and extension portions which are connected to teeter bearing blocks, each of which has an aperture. The blocks are connected to a saddle which envelops the rotor blade by one or two shafts which pass through the apertures in the bearing blocks. The saddle and blade are separated by a rubber interface which provides for distribution of stress over a larger portion of the blade. Two teeter control mechanisms, which may include hydraulic pistons and springs, are connected to the rotor blade and to the yoke at extension portions. These control mechanisms provide end-of-stroke damping, braking, and stiffness based on the teeter angle and speed of the blade.

  18. Atmospheric Stability Impacts on Power Curves of Tall Wind Turbines - An Analysis of a West Coast North American Wind Farm

    SciTech Connect (OSTI)

    Wharton, S; Lundquist, J K

    2010-02-22

    Tall wind turbines, with hub heights at 80 m or above, can extract large amounts of energy from the atmosphere because they are likely to encounter higher wind speeds, but they face challenges given the complex nature of wind flow and turbulence at these heights in the boundary layer. Depending on whether the boundary layer is stable, neutral, or convective, the mean wind speed, direction, and turbulence properties may vary greatly across the tall turbine swept area (40 to 120 m AGL). This variability can cause tall turbines to produce difference amounts of power during time periods with identical hub height wind speeds. Using meteorological and power generation data from a West Coast North American wind farm over a one-year period, our study synthesizes standard wind park observations, such as wind speed from turbine nacelles and sparse meteorological tower observations, with high-resolution profiles of wind speed and turbulence from a remote sensing platform, to quantify the impact of atmospheric stability on power output. We first compare approaches to defining atmospheric stability. The standard, limited, wind farm operations enable the calculation only of a wind shear exponent ({alpha}) or turbulence intensity (I{sub U}) from cup anemometers, while the presence at this wind farm of a SODAR enables the direct observation of turbulent kinetic energy (TKE) throughout the turbine rotor disk. Additionally, a nearby research meteorological station provided observations of the Obukhov length, L, a direct measure of atmospheric stability. In general, the stability parameters {alpha}, I{sub U}, and TKE are in high agreement with the more physically-robust L, with TKE exhibiting the best agreement with L. Using these metrics, data periods are segregated by stability class to investigate power performance dependencies. Power output at this wind farm is highly correlated with atmospheric stability during the spring and summer months, while atmospheric stability exerts little impact on power output during the winter and autumn periods. During the spring and summer seasons, power output for a given wind speed was significantly higher during stable conditions and significantly lower during strongly convective conditions: power output differences approached 20% between stable and convective regimes. The dependency of stability on power output was apparent only when both turbulence and the shape of the wind speed profile were considered. Turbulence is one of the mechanisms by which atmospheric stability affects a turbine's power curve at this particular site, and measurements of turbulence can yield actionable insights into wind turbine behavior.

  19. Sutherland, Wind Energy 2002, ASME/AIAA AIAA-2002-0065 INFLOW AND THE FATIGUE OF THE LIST WIND TURBINE*

    E-Print Network [OSTI]

    TURBINE* Herbert J. Sutherland Wind Energy Technology Department Sandia National Laboratory Albuquerque on wind turbines. A heavily instrumented Micon 65/13M turbine with SERI 8m blades is being used as the primary test turbine for this test. This turbine is located in Bushland, TX, a test site that exposes

  20. RESEARCH ARTICLE Dynamic wind loads and wake characteristics of a wind turbine

    E-Print Network [OSTI]

    Hu, Hui

    installed in onshore or/and offshore wind farms in order to meet the 20% electricity generation goal. WindRESEARCH ARTICLE Dynamic wind loads and wake characteristics of a wind turbine model in an atmospheric boundary layer wind Hui Hu · Zifeng Yang · Partha Sarkar Received: 16 August 2011 / Revised: 1

  1. Aalborg Universitet Methodologies for Wind Turbine and STATCOM Integration in Wind Power Plant

    E-Print Network [OSTI]

    Bak, Claus Leth

    Aalborg Universitet Methodologies for Wind Turbine and STATCOM Integration in Wind Power Plant Integration in Wind Power Plant Models for Harmonic Resonances Assessment. In Proceedings of the 14th Wind Integration Workshop: International Workshop on Large-Scale Integration of Wind Power into Power Systems

  2. Power control of a wind farm with active stall wind turbines and AC grid connection

    E-Print Network [OSTI]

    Power control of a wind farm with active stall wind turbines and AC grid connection Anca D. Hansen1 on the wind farm level. The ability of active stall wind farms with AC grid connection to regulate the power, is therefore directed towards optimising the integration of large wind farms within the electrical power grid

  3. Fast Verification of Wind Turbine Power Summary of Project Results

    E-Print Network [OSTI]

    Fast Verification of Wind Turbine Power Curves: Summary of Project Results by: Cameron Brown ­ s in the FastWind project. Several methods of estimating the power curve uncertainty were developed, it was found to be sensitive to the coherence of high frequency wind speed and power measurements

  4. Nonlinear Control of a Wind Turbine Sven Creutz Thomsen

    E-Print Network [OSTI]

    generated by generator Pr [W] - Mechanical power absorbed from the wind Rr [m] - Radius of rotors Tg [Nm to generator Tsr [Nm] - Generator torque transfered to rotor v [m/s] - Effective wind speed vf [mNonlinear Control of a Wind Turbine Sven Creutz Thomsen Kongens Lyngby 2006 #12;Technical

  5. Sparkr Blade Test Centre Static tests of wind turbine blades

    E-Print Network [OSTI]

    Sparkær Blade Test Centre Static tests of wind turbine blades Static blade tests are performed down- and up-wind direction, and in the rotor thrust direction and opposite to that, respectively-4000 Roskilde Denmark www.risoe.dk Wind Energy Department Sparkær Blade test Centre vea@risoe.dk Tel

  6. Assessing Novel Foundation Options for Offshore Wind Turbines

    E-Print Network [OSTI]

    Byrne, Byron

    Assessing Novel Foundation Options for Offshore Wind Turbines B.W. Byrne, BE(Hons), BCom, MA, DPhil G.T. Houlsby, MA, DSc, FREng, FICE Oxford University, UK SYNOPSIS Offshore wind farms, and of these wind power is the only one to be exploited on a commercial scale at present. Three major offshore

  7. Offshore Code Comparison Collaboration within IEA Wind Task 23: Phase IV Results Regarding Floating Wind Turbine Modeling; Preprint

    SciTech Connect (OSTI)

    Jonkman, J.; Larsen, T.; Hansen, A.; Nygaard, T.; Maus, K.; Karimirad, M.; Gao, Z.; Moan, T.; Fylling, I.

    2010-04-01

    Offshore wind turbines are designed and analyzed using comprehensive simulation codes that account for the coupled dynamics of the wind inflow, aerodynamics, elasticity, and controls of the turbine, along with the incident waves, sea current, hydrodynamics, and foundation dynamics of the support structure. This paper describes the latest findings of the code-to-code verification activities of the Offshore Code Comparison Collaboration, which operates under Subtask 2 of the International Energy Agency Wind Task 23. In the latest phase of the project, participants used an assortment of codes to model the coupled dynamic response of a 5-MW wind turbine installed on a floating spar buoy in 320 m of water. Code predictions were compared from load-case simulations selected to test different model features. The comparisons have resulted in a greater understanding of offshore floating wind turbine dynamics and modeling techniques, and better knowledge of the validity of various approximations. The lessons learned from this exercise have improved the participants' codes, thus improving the standard of offshore wind turbine modeling.

  8. Wind turbine having a direct-drive drivetrain

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2011-02-22

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  9. Wind turbine/generator set and method of making same

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2013-06-04

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  10. RELIABILITY BASED DESIGN OF FIXED FOUNDATION WIND TURBINES

    SciTech Connect (OSTI)

    Nichols, R.

    2013-10-14

    Recent analysis of offshore wind turbine foundations using both applicable API and IEC standards show that the total load demand from wind and waves is greatest in wave driven storms. Further, analysis of overturning moment loads (OTM) reveal that impact forces exerted by breaking waves are the largest contributor to OTM in big storms at wind speeds above the operating range of 25 m/s. Currently, no codes or standards for offshore wind power generators have been adopted by the Bureau of Ocean Energy Management Regulation and Enforcement (BOEMRE) for use on the Outer Continental Shelf (OCS). Current design methods based on allowable stress design (ASD) incorporate the uncertainty in the variation of loads transferred to the foundation and geotechnical capacity of the soil and rock to support the loads is incorporated into a factor of safety. Sources of uncertainty include spatial and temporal variation of engineering properties, reliability of property measurements applicability and sufficiency of sampling and testing methods, modeling errors, and variability of estimated load predictions. In ASD these sources of variability are generally given qualitative rather than quantitative consideration. The IEC 61400‐3 design standard for offshore wind turbines is based on ASD methods. Load and resistance factor design (LRFD) methods are being increasingly used in the design of structures. Uncertainties such as those listed above can be included quantitatively into the LRFD process. In LRFD load factors and resistance factors are statistically based. This type of analysis recognizes that there is always some probability of failure and enables the probability of failure to be quantified. This paper presents an integrated approach consisting of field observations and numerical simulation to establish the distribution of loads from breaking waves to support the LRFD of fixed offshore foundations.

  11. Yaw dynamics of horizontal axis wind turbines

    SciTech Connect (OSTI)

    Hansen, A.C. (Utah Univ., Salt Lake City, UT (United States))

    1992-05-01

    Designers of a horizontal axis wind turbine yaw mechanism are faced with a difficult decision. They know that if they elect to use a yaw- controlled rotor then the system will suffer increased initial cost and increased inherent maintenance and reliability problems. On the other hand, if they elect to allow the rotor to freely yaw they known they will have to account for unknown and random, though bounded, yaw rates. They will have a higher-risk design to trade-off against the potential for cost savings and reliability improvement. The risk of a yaw-free system could be minimized if methods were available for analyzing and understanding yaw behavior. The complexity of yaw behavior has, until recently, discouraged engineers from developing a complete yaw analysis method. The objectives of this work are to (1) provide a fundamental understanding of free-yaw mechanics and the design concepts most effective at eliminating yaw problems, and (2) provide tested design tools and guidelines for use by free-yaw wind systems manufacturers. The emphasis is on developing practical and sufficiently accurate design methods.

  12. Investigation of Various Wind Turbine Drivetrain Condition Monitoring Techniques (Presentation)

    SciTech Connect (OSTI)

    Sheng, S.

    2011-08-01

    This presentation was given at the 2011 Wind Turbine Reliability Workshop sponsored by Sandia National Laboratories in Albuquerque, NM on August 2-3, 2011. It discusses work for the Gearbox Reliability Collaborative including downtime caused by turbine subsystems, annual failure frequency of turbine subsystems, cost benefits of condition monitoring (CM), the Gearbox Reliability Collaborative's condition monitoring approach and rationale, test setup, and results and observations.

  13. SMART Wind Turbine Rotor: Design and Field Test

    SciTech Connect (OSTI)

    Berg, Jonathan C.; Resor, Brian R.; Paquette, Joshua A.; White, Jonathan R.

    2014-01-29

    This report documents the design, fabrication, and testing of the SMART Rotor. This work established hypothetical approaches for integrating active aerodynamic devices (AADs) into the wind turbine structure and controllers.

  14. SNL Wake Imaging System Solves Wind Turbine Wake Formation Mysteries...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    A white van parked further downwind and to the side houses the receiver camera optics that capture images of the wind turbine's trailing tip vortices. Helping to Settle a...

  15. Experimental and theoretical study of horizontal-axis wind turbines

    E-Print Network [OSTI]

    Anderson, Michael Broughton

    1981-10-20

    An experimental and theoretical study of horizontal-axis wind turbines is undertaken. The theoretical analyses cover the four major areas of aerodynamics, turbulence. aeroelasticity and blade optimisation. EXisting aerodynamic theories based...

  16. Coupled Dynamic Analysis of Multiple Unit Floating Offshore Wind Turbine 

    E-Print Network [OSTI]

    Bae, Yoon Hyeok

    2013-04-23

    In the present study, a numerical simulation tool has been developed for the rotor-floater-tether coupled dynamic analysis of Multiple Unit Floating Offshore Wind Turbine (MUFOWT) in the time domain including aero-blade-tower dynamics and control...

  17. Design of wind turbines with Ultra-High Performance Concrete

    E-Print Network [OSTI]

    Jammes, François-Xavier

    2009-01-01

    Ultra-High Performance Concrete (UHPC) has proven an asset for bridge design as it significantly reduces costs. However, UHPC has not been applied yet to wind turbine technology. Design codes do not propose any recommendations ...

  18. Vertical axis wind turbine with continuous blade angle adjustment

    E-Print Network [OSTI]

    Weiss, Samuel Bruce

    2010-01-01

    The author presents a concept for a vertical axis wind turbine that utilizes each blade's entire rotational cycle for power generation. Each blade has its own vertical axis of rotation and is constrained to rotate at the ...

  19. Wind Turbine Inspection Technology Reaches New Heights | GE Global...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Home > Edison's Desk > Wind Turbine Inspection Technology Reaches New Heights Click to email this to a friend (Opens in new window) Share on Facebook (Opens in new window) Click to...

  20. Superconducting generators for large off shore wind turbines 

    E-Print Network [OSTI]

    Keysan, Ozan

    2014-06-30

    This thesis describes four novel superconducting machine concepts, in the pursuit of finding a suitable design for large offshore wind turbines. The designs should be reliable, modular and light-weight. The main novelty ...

  1. ECO ROTR - The Future of Wind Turbines | GE Global Research

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    our domes of different sizes and then stuck these domes on the center of the small wind turbine and ran our experiments at different tunnel air speeds. The picture of the...

  2. DWEA Webinar: IRS Guidance for Small Wind Turbines

    Broader source: Energy.gov [DOE]

    The U.S. Internal Revenue Service (IRS) has issued Notice 2015-4 providing new performance and quality standards of small wind turbines – defined as having a nameplate capacity of up to 100 kW – in...

  3. Performance Study and Optimization of the Zephergy Wind Turbine 

    E-Print Network [OSTI]

    Soodavi, Moein

    2013-12-04

    There are many problems associated with small wind turbines, such as small Reynolds number and poor starting performance, that make them much more expensive than the large ones per unit power. New technologies are needed to improve the quality...

  4. Full Life Wind Turbine Gearbox Lubricating Fluids

    SciTech Connect (OSTI)

    Lutz, Glenn A.; Jungk, Manfred; Bryant, Jonathan J.; Lauer, Rebecca S.; Chobot, Anthony; Mayer, Tyler; Palmer, Shane; Kauffman, Robert E.

    2012-02-28

    Industrial gear box lubricants typically are hydrocarbon based mineral oils with considerable amounts of additives to overcome the lack of base fluid properties like wear protection, oxidation stability, load carrying capacity, low temperature solidification and drop of viscosity at higher temperatures. For today's wind turbine gearboxes, the requirements are more severe and synthetic hydrocarbon oils are used to improve on this, but all such hydrocarbon based lubricants require significant amounts of Extreme Pressure (EP) additives to meet performance requirements. Perfluoropolyether (PFPE) fluids provide load carrying capacity as an inherent property. During the course of the project with the main tasks of 'Establish a Benchmark', 'Lubricant Evaluation', 'Full Scale Gearbox Trial' and 'Economic Evaluation', the PAO Reference oil exhibited significant changes after laboratory gear testing, in service operation in the field and full scale gearbox trial. Four hydrocarbon base oils were selected for comparison in the benchmarking exercise and showed variation with respect to meeting the requirements for the laboratory micro-pitting tests, while the PFPE fluid exceeded the requirements even with the material taken after the full scale gear box trial. This is remarkable for a lubricant without EP additives. Laboratory bearing tests performed on the PFPE fluids before and after the full scale gear box trial showed the results met requirements for the industry standard. The PFPE fluid successfully completed the full scale gear box test program which included baseline and progressive staged load testing. The evaluation of gears showed no micro-pitting or objectionable wear. By the final stage, lubricant film thickness had been reduced to just 21% of its original value, this was by design and resulted in a lambda ratio of well below 1. This test design scenario of a low lambda ratio is a very undesirable lubrication condition for real world but creates the ability to test the lubricating fluids performance under the most extreme conditions. The PAO Reference oil also passed its testing without any noticeable deterioration of the gear surface. However the PAO Reference oil was replaced midway through the progressive loading, as the lubricant was burned in an attempt to raise the sump temperature to the same levels as for the PFPE. Both materials experienced a decrease of viscosity during their respective run times. The viscosity index decreased for the PAO there while there was a slight increase for the PFPE. FZG laboratory gear tests and measurements of the drive motor's current during the full scale gear box trial were made to characterize the relative efficiency between the PFPE fluid and the PAO Reference oil. In the FZG laboratory efficiency test, the PFPE fluids show much higher churning losses due to their higher viscosity and density. The analysis seems to show that the efficiency correlates better to dynamic viscosity than any other of the measured metrics such as film thickness. In load stages where the load, speed and temperature are similar, the PFPE fluid has a greater film thickness and theoretical gear protection, but requires a larger current for the drive motor than the PAO. However in load stages where the film thickness is the same, the PFPE fluid's reduced dynamic viscosity gives it a slight efficiency advantage relative to the PAO reference oil. Ultimately, many factors such as temperature, rotational speed, and fluid viscosity combine in a complex fashion to influence the results. However, the PFPE's much lower change of viscosity with respect to temperature, allows variations in designing an optimum viscosity to balance efficiency versus gear protection. Economic analysis was done using Cost of Energy calculations. The results vary from 5.3% for a 'Likely Case' to 16.8% for a 'Best Case' scenario as potential cost improvement by using PFPE as the gearbox lubricating fluid. It is important to note the largest portion of savings comes in Levelized Replacement Cost, which is dictated by the assumption on gearb

  5. Impact of DFIG wind turbines on transient stability of power systems a review

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    Impact of DFIG wind turbines on transient stability of power systems ­ a review Authors Na Abstract of wind farms are using variable speed wind turbines equipped with doubly-fed induction generators (DFIG) due to their advantages over other wind turbine generators. Therefore, the analysis of wind power

  6. Computational analysis of shrouded wind turbine configurations using a 3-dimensional RANS solver

    E-Print Network [OSTI]

    Alonso, Juan J.

    October 2014 Available online Keywords: Wind energy Shrouded wind turbines DAWT CFD Transition model a b presently confronting the widespread adoption of wind energy is cost. Improvements in wind turbineComputational analysis of shrouded wind turbine configurations using a 3-dimensional RANS solver

  7. DOE/SNL-TTU scaled wind farm technology facility : research opportunities for study of turbine-turbine interaction.

    SciTech Connect (OSTI)

    Barone, Matthew Franklin; White, Jonathan

    2011-09-01

    The proposed DOE/Sandia Scaled Wind Farm Technology Facility (SWiFT) hosted by Texas Tech University at Reese Technology Center in Lubbock, TX, will provide a facility for experimental study of turbine-turbine interaction and complex wind farm aerodynamics. This document surveys the current status of wind turbine wake and turbine-turbine interaction research, identifying knowledge and data gaps that the proposed test site can potentially fill. A number of turbine layouts is proposed, allowing for up to ten turbines at the site.

  8. Wind Tunnel Aerodynamic Tests of Six Airfoils for Use on Small Wind Turbines; Period of Performance: October 31, 2002--January 31, 2003

    SciTech Connect (OSTI)

    Selig, M. S.; McGranahan, B. D.

    2004-10-01

    Wind Tunnel Aerodynamic Tests of Six Airfoils for Use on Small Wind Turbinesrepresents the fourth installment in a series of volumes documenting the ongoing work of th University of Illinois at Urbana-Champaign Low-Speed Airfoil Tests Program. This particular volume deals with airfoils that are candidates for use on small wind turbines, which operate at low Reynolds numbers.

  9. Prediction, operations, and condition monitoring in wind energy Andrew Kusiak a,*, Zijun Zhang b

    E-Print Network [OSTI]

    Kusiak, Andrew

    Review Prediction, operations, and condition monitoring in wind energy Andrew Kusiak a,*, Zijun 2013 Available online 23 August 2013 Keywords: Wind energy Wind speed prediction Wind turbine control Condition monitoring and fault detection a b s t r a c t Recent developments in wind energy research

  10. Multivariate analysis and prediction of wind turbine response to varying wind field characteristics based on machine learning

    E-Print Network [OSTI]

    Stanford University

    Multivariate analysis and prediction of wind turbine response to varying wind field characteristics characteristics have a significant impact on the structural response and the lifespan of wind turbines. This paper presents a machine learning approach towards analyzing and predicting the response of wind turbine

  11. Dual-Axis Resonance Testing of Wind Turbine Blades

    Energy Innovation Portal (Marketing Summaries) [EERE]

    2014-07-28

    Wind turbine blades must undergo strength and fatigue testing in order to be rated and marketed appropriately. Presently, wind turbine blades are fatigue-tested in the flapwise direction and in the edgewise direction independently. This testing involves placing the blades through 1 to 10 million or more load or fatigue cycles, which may take 3 to 12 months or more to complete for each tested direction. There is a need for blade testing techniques that are less expensive to use and require...

  12. Impact of Coherent Turbulence on Wind Turbine Aeroelastic Response and Its Simulation: Preprint

    SciTech Connect (OSTI)

    Kelley, N. D.; Jonkman, B. J.; Scott, G. N.; Bialasiewicz, J. T.; Redmond, L. S.

    2005-08-01

    In this paper, we present a brief overview of our recent research results regarding the impact of organized or coherent inflow turbulence on the dynamic response of operating wind turbines. Previous field experimentation has demonstrated that the greatest structural fatigue damage tends to occur during the nighttime hours from coherent turbulence that develops in the stable, nocturnal atmospheric boundary layer. We have found that under such conditions, intense vertical wind shear and temperature gradients create resonant flow fields that are capable of imparting short-period loading and vibrational energy as wind turbine rotor blades pass through regions of organized or coherent turbulence. This energy is subsequently propagated throughout the remainder of the structure, where it is often locally dissipated. We also briefly discuss our recent progress in developing a numerical simulation that includes such coherent inflow conditions that can be used to excite wind turbine design codes.

  13. Rotor Speed Dependent Yaw Control of Wind Turbines Based on Empirical Data

    SciTech Connect (OSTI)

    Kragh, K. A.; Fleming, P. A.

    2012-01-01

    When extracting energy from the wind using horizontal-axis upwind wind turbines, a primary condition for maximum power yield is the ability to align the rotor axis with the dominating wind direction. Attempts have been made to improve yaw alignment by applying advanced measurement techniques such as LIDARs. This study is focused at assessing the current performance of an operating turbine and exploring how the yaw alignment can be improved using existing measurements. By analyzing available turbine and met mast data a correction scheme for the original yaw alignment system is synthesized. The correction scheme is applied and it is seen that with the correction scheme in place, the power yield below rated is raised 1-5 percent. Furthermore, results indicate that blade load variations are decreased when the correction scheme is applied. The results are associated with uncertainties due to the amount of available data and the wind site climate. Further work should be focused at gathering more experimental data.

  14. Wind Scanner: A full-scale Laser Facility for Wind and Turbulence Measurements around large Wind Turbines

    E-Print Network [OSTI]

    Wind Scanner: A full-scale Laser Facility for Wind and Turbulence Measurements around large Wind Turbines Torben Mikkelsen, Jakob Mann and Michael Courtney Wind Energy Department, Risø National Laboratory:Torben.Mikkelsen@Risoe.dk Summary RISØ DTU has started to build a newly designed laser-based lidar scanning facility for remote wind

  15. Wind Turbine Shutdowns and Upgrades in Denmark: Timing Decisions and the Impact of Government Policy

    E-Print Network [OSTI]

    Lin, C.-Y. Cynthia

    Wind Turbine Shutdowns and Upgrades in Denmark: Timing Decisions and the Impact of Government structural econometric model of wind turbine owners' decisions about whether and when to add new turbines to a pre-existing stock, scrap an existing turbine, or replace old turbines with newer versions (i

  16. Advanced Control Design and Field Testing for Wind Turbines at the National Renewable Energy Laboratory: Preprint

    SciTech Connect (OSTI)

    Hand, M. M.; Johnson, K. E.; Fingersh, L. J.; Wright, A. D.

    2004-05-01

    Utility-scale wind turbines require active control systems to operate at variable rotational speeds. As turbines become larger and more flexible, advanced control algorithms become necessary to meet multiple objectives such as speed regulation, blade load mitigation, and mode stabilization. At the same time, they must maximize energy capture. The National Renewable Energy Laboratory has developed control design and testing capabilities to meet these growing challenges.

  17. IEEE TRANSACTIONS ON RELIABILITY, VOL. 59, NO. 2, JUNE 2010 393 Optimal Maintenance Strategies for Wind Turbine

    E-Print Network [OSTI]

    Ding, Yu

    . Considering today's trend of large-scale wind farms, and their long distance from operation centers, the cost for Wind Turbine Systems Under Stochastic Weather Conditions Eunshin Byon, Student Member, IEEE, Lewis Ntaimo, and Yu Ding, Member, IEEE Abstract--We examine optimal repair strategies for wind tur- bines

  18. Turbine Reliability and Operability Optimization through the use of Direct Detection Lidar Final Technical Report

    SciTech Connect (OSTI)

    Johnson, David K; Lewis, Matthew J; Pavlich, Jane C; Wright, Alan D; Johnson, Kathryn E; Pace, Andrew M

    2013-02-01

    The goal of this Department of Energy (DOE) project is to increase wind turbine efficiency and reliability with the use of a Light Detection and Ranging (LIDAR) system. The LIDAR provides wind speed and direction data that can be used to help mitigate the fatigue stress on the turbine blades and internal components caused by wind gusts, sub-optimal pointing and reactionary speed or RPM changes. This effort will have a significant impact on the operation and maintenance costs of turbines across the industry. During the course of the project, Michigan Aerospace Corporation (MAC) modified and tested a prototype direct detection wind LIDAR instrument; the resulting LIDAR design considered all aspects of wind turbine LIDAR operation from mounting, assembly, and environmental operating conditions to laser safety. Additionally, in co-operation with our partners, the National Renewable Energy Lab and the Colorado School of Mines, progress was made in LIDAR performance modeling as well as LIDAR feed forward control system modeling and simulation. The results of this investigation showed that using LIDAR measurements to change between baseline and extreme event controllers in a switching architecture can reduce damage equivalent loads on blades and tower, and produce higher mean power output due to fewer overspeed events. This DOE project has led to continued venture capital investment and engagement with leading turbine OEMs, wind farm developers, and wind farm owner/operators.

  19. Method and apparatus for wind turbine air gap control

    DOE Patents [OSTI]

    Grant, James Jonathan; Bagepalli, Bharat Sampathkumaran; Jansen, Patrick Lee; DiMascio, Paul Stephen; Gadre, Aniruddha Dattatraya; Qu, Ronghai

    2007-02-20

    Methods and apparatus for assembling a wind turbine generator are provided. The wind turbine generator includes a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis, a rotor rotatable about the generator longitudinal axis wherein the rotor includes a plurality of magnetic elements coupled to a radially outer periphery of the rotor such that an airgap is defined between the stator windings and the magnetic elements and the plurality of magnetic elements including a radially inner periphery having a first diameter. The wind turbine generator also includes a bearing including a first member in rotatable engagement with a radially inner second member, the first member including a radially outer periphery, a diameter of the radially outer periphery of the first member being substantially equal to the first diameter, the rotor coupled to the stator through the bearing such that a substantially uniform airgap is maintained.

  20. Estimation of Seismic Load Demand for a Wind Turbine in the Time Domain: Preprint

    SciTech Connect (OSTI)

    Prowell, I.; Elgamal, A.; Uang, C.; Jonkman, J.

    2010-03-01

    Turbines installed in seismically active regions such as the Pacific Rim or the Mediterranean must consider loads induced by base shaking from an earthquake. To account for this earthquake risk, current International Electrotechnical Commission (IEC) certification requirements provide a simplified method for calculating seismic loads which is intended to be conservative. Through the addition of capabilities, it is now possible to simulate earthquake loading of a wind turbine in conjunction other load sources such as wind and control system behavior using the FAST code. This paper presents a comparison of three earthquake loading scenarios of the National Renewable Energy Laboratory (NREL) offshore 5-MW baseline wind turbine: idling; continued operation through an earthquake; and an emergency shutdown initiated by an earthquake. Using a set of 22 earthquake records, simulations are conducted for each load case. A summary of the resulting tower moment demand is presented to assess the influence of operational state on the resulting structural demand.

  1. A Stochastic DEVS Wind Turbine Component Model for Wind Farm Simulation

    E-Print Network [OSTI]

    Ding, Yu

    . Many wind farms are located in remote areas or offshore and are therefore, less accessible. FurtherA Stochastic DEVS Wind Turbine Component Model for Wind Farm Simulation Eduardo P´erez, Lewis 3131 TAMU, College Station, TX 77843, USA. eduardopr@tamu.edu and ntaimo@tamu.edu Keywords: Wind farm

  2. SAR-BASED WIND CLIMATOLOGY FOR WIND TURBINES Merete Bruun Christiansen(1)

    E-Print Network [OSTI]

    SAR-BASED WIND CLIMATOLOGY FOR WIND TURBINES Merete Bruun Christiansen(1) , Charlotte Bay Hasager(1) , Donald Thompson(2) , Lars Boye Hansen(3) (1) Wind Energy Department, Risø National Laboratory, Technical, Denmark ABSTRACT Wind fields extracted from synthetic aperture radar (SAR) imagery are used to analyze

  3. Modelling of offshore wind turbine wakes with the wind farm program FLaP

    E-Print Network [OSTI]

    Heinemann, Detlev

    Modelling of offshore wind turbine wakes with the wind farm program FLaP Bernhard Lange(1) , Hans from the Danish offshore wind farm Vindeby. Vertical wake profiles and mean turbulence intensities are not modelled satisfactorily. Keywords: Offshore, wind farm, wake model, Vindeby, turbulence intensity

  4. Does the infrasound from wind turbines affect the inner ear? Alec N. Salt1

    E-Print Network [OSTI]

    Salt, Alec N.

    Does the infrasound from wind turbines affect the inner ear? Alec N. Salt1 1 Washington University turbines adversely affects human health. The unweighted spectrum of wind turbine noise slowly rises (needing over 120 dB SPL to detect 2 Hz) it is claimed that infrasound generated by wind turbines is below

  5. Energy Based Methods in Wind Turbine Control CeSOS Highlights and AMOS Visions

    E-Print Network [OSTI]

    Nørvåg, Kjetil

    Energy Based Methods in Wind Turbine Control CeSOS Highlights and AMOS Visions Morten D. Pedersen 1 / 26 #12;This talk 1 Background 2 Understanding the Wind Turbine 3 Nonlinear Turbine Modeling 4;Background The Problem Previously stable wind turbine systems began exhibiting resonant behavior when put

  6. RIS0-M-2242 ANALYSIS OF DATA FROM THE GEDSER WIND TURBINE 1977-1979

    E-Print Network [OSTI]

    RIS0-M-2242 ANALYSIS OF DATA FROM THE GEDSER WIND TURBINE 1977-1979 P. Lundsager, S. Frandsen, C on the data from the Gedser wind turbine measurements, made during 1977 to 1979. The report contains chap turbine with modern Danish, Swedish and American experimental wind turbines, based on published data. UDC

  7. M. Bahrami ENSC 283 (S 11) Wind Turbine Project 1 ENSC 283 Project

    E-Print Network [OSTI]

    Bahrami, Majid

    and the vertical-axis wind turbine (VAWT) in Figure 2-b. The designation simply depends on the axis of rotationM. Bahrami ENSC 283 (S 11) Wind Turbine Project 1 ENSC 283 Project Assigned date: Feb. 23, 2011 family), but also important are those which extract energy form the fluid such as turbines. Wind turbines

  8. Concepts for Wind Turbine Sound Mitigation Page 1 of 16 AWEA Windpower 2013

    E-Print Network [OSTI]

    McCalley, James D.

    for wind turbine sound generation starting at the turbine source and ending at the receptor. Figure 1 sources of sound generated by a wind turbine are mechanical noise and aerodynamic noise. Mechanical noiseConcepts for Wind Turbine Sound Mitigation Page 1 of 16 AWEA Windpower 2013 Chicago, IL May 6

  9. Advanced Wind Turbine Program Next Generation Turbine Development Project: June 17, 1997--April 30, 2005

    SciTech Connect (OSTI)

    GE Wind Energy, LLC

    2006-05-01

    This document reports the technical results of the Next Generation Turbine Development Project conducted by GE Wind Energy LLC. This project is jointly funded by GE and the U.S. Department of Energy's National Renewable Energy Laboratory.The goal of this project is for DOE to assist the U.S. wind industry in exploring new concepts and applications of cutting-edge technology in pursuit of the specific objective of developing a wind turbine that can generate electricity at a levelized cost of energy of $0.025/kWh at sites with an average wind speed of 15 mph (at 10 m height).

  10. Design of Wind Turbines in an Area with Tropical Cyclones Niels-Erik Clausen, niels-erik.clausen@risoe.dk, Sren Ott, Niels-Jacob Tarp-Johansen, Per Nrgrd and

    E-Print Network [OSTI]

    Design of Wind Turbines in an Area with Tropical Cyclones Niels-Erik Clausen, niels and cost of wind turbines is influenced by a combination of fatigue and extreme loads and the applied design codes. In general wind turbines are designed for 20 years of operation using design standards

  11. First U.S. Grid-Connected Offshore Wind Turbine Installed Off...

    Broader source: Energy.gov (indexed) [DOE]

    Composites Center partnered with Maine Maritime Academy and Cianbro to launch a deepwater offshore floating wind turbine near Bangor. When the turbine was turned on and electricity...

  12. EVALUATION OF HAND LAY-UP AND RESIN TRANSFER MOLDING IN COMPOSITE WIND TURBINE BLADE MANUFACTURING

    E-Print Network [OSTI]

    EVALUATION OF HAND LAY-UP AND RESIN TRANSFER MOLDING IN COMPOSITE WIND TURBINE BLADE MANUFACTURING..........................................................................................................1 Hand Lay-up in Turbine Blade Fabrication

  13. Vibration and Structural Response of Hybrid Wind Turbine Blades 

    E-Print Network [OSTI]

    Nanami, Norimichi

    2011-02-22

    to the square of the blade length and the cube of the wind speed, wind turbine size has grown rapidly in the last two decades to match the increase in power output. As the blade length increases, so does its weight opening up design possibilities to introduce...

  14. Review of Wind Turbine Wake Models and Future Directions (Presentation)

    SciTech Connect (OSTI)

    Churchfield, M. J.

    2013-08-01

    This presentation gives a brief overview to wind turbine wake modeling, ranging from models used in the 1980s up to the present. The presentation shows the strengths and weaknesses of various models and discusses the needs of the wind energy industry and research sectors. Both power production and loads analysis are discussed.

  15. Field verification program for small wind turbines. Quarterly report for the period October - December 1999

    SciTech Connect (OSTI)

    Hansen, A. Craig; Davis, Dean A.

    2000-01-26

    Windward Engineering has a Cooperative Agreement with the Department of Energy to install two Whisper 900 wind turbines, one at the NREL National Wind Technology Center and one at a test site near Spanish Fork Utah. The authors monitor the turbine in Spanish Fork for approximately three years and report energy production availability, and general operating experience. In addition, they created a computer model to predict the furling behavior of the Whisper 900. They compare the predictions with measurements from the Utah test site. This is the first quarterly report on this project. The report is organized into 6 tasks and the progress is discussed for each task. The tasks are: (1) Install two turbines and repair as needed; (2) Phase 1 testing and analysis; (3) Phase 2 testing and analysis; (4) Phase 3 testing and analysis; (5) Turbine removal and inspection; and (6) Reporting and administration.

  16. Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting

    E-Print Network [OSTI]

    Capps, Scott B; Zender, Charles S

    2010-01-01

    observations, accounting for turbine characteristics andobservations, accounting for turbine characteristics andglobal ocean 80 m wind power accounting for surface layer

  17. RECYCLING AND REMOVAL OF OFFSHORE WIND TURBINES AN INTERACTIVE METHOD FOR REDUCTION OF NEGATIVE ENVIRONMENTAL EFFECTS

    E-Print Network [OSTI]

    phases of new wind turbines. There are plans about offshore wind farms in many countries e.g. in northernRECYCLING AND REMOVAL OF OFFSHORE WIND TURBINES ­ AN INTERACTIVE METHOD FOR REDUCTION OF NEGATIVE and an analysis of future removal and recycling processes of offshore wind turbines. The method is process

  18. PERFORMANCE ENHANCEMENT OF WIND TURBINE POWER REGULATION BY SWITCHED LINEAR CONTROL

    E-Print Network [OSTI]

    Duffy, Ken

    PERFORMANCE ENHANCEMENT OF WIND TURBINE POWER REGULATION BY SWITCHED LINEAR CONTROL D.J.Leith W Power regulation of horizontal-axis grid-connected up-wind constant-speed pitch-regulated wind turbines ENHANCEMENT OF WIND TURBINE POWER REGULATION BY SWITCHED LINEAR CONTROL D.J.Leith W.E.Leithead Department

  19. St h ti d i l i fStochastic dynamic analysis of offshore wind turbines

    E-Print Network [OSTI]

    Nørvåg, Kjetil

    1 St h ti d i l i fStochastic dynamic analysis of offshore wind turbines ­ with emphasis on fatigue Co te ts · Overview of offshore wind technology · Modelling of environmental conditions · Dynamic analysis of offshore bottom-fixed wind turbines · Modelling and dynamic analysis of floating wind turbines

  20. OTC 23597-MS Numerical Simulation of Floating Offshore Wind Turbines Including Aero-

    E-Print Network [OSTI]

    Sweetman, Bert

    OTC 23597-MS Numerical Simulation of Floating Offshore Wind Turbines Including Aero- Elasticity methodology is presented for simulation of dynamic behavior of floating offshore wind turbines. Wind forces. Introduction and Background The economic potential of offshore deep water wind turbines has not yet been fully

  1. CONTINUOUS FATIGUE ASSESSMENT OF AN OFFSHORE WIND TURBINE USING A LIMITED NUMBER OF VIBRATION SENSORS

    E-Print Network [OSTI]

    Boyer, Edmond

    CONTINUOUS FATIGUE ASSESSMENT OF AN OFFSHORE WIND TURBINE USING A LIMITED NUMBER OF VIBRATION Wind turbines are exposed to continuous wind and wave excitation that leads to high periodic stresses initiations and propagations. The continuous monitoring of the Wind Turbine is of utmost importance in order

  2. Project Title: Residential wind turbine design Project Description: This project aims to

    E-Print Network [OSTI]

    Muradoglu, Metin

    that wind is expected to come. Therefore it may be a good idea to consider a vertical-axis wind turbine of the conventional wind turbines use horizontal- axis configuration (see Fig. 1) and is aligned with the directionPROJECT 1: Project Title: Residential wind turbine design Project Description: This project aims

  3. Performance Testing of a Small Vertical-Axis Wind Turbine , S. Tullis2

    E-Print Network [OSTI]

    Tullis, Stephen

    Performance Testing of a Small Vertical-Axis Wind Turbine R. Bravo1 , S. Tullis2 , S. Ziada3 of electric production [1]. Although most performance testing for small-scale wind turbines is conducted vertical-axis wind turbines (VAWT) in urban settings, full-scale wind tunnel testing of a prototype 3.5 k

  4. AIAA-2004-0502 A COMPARISON OF WIND TURBINE DESIGN LOADS IN DIFFERENT

    E-Print Network [OSTI]

    Manuel, Lance

    wind speed. For wind turbine generator systems, a similar reliability-based design format is employedAIAA-2004-0502 1 A COMPARISON OF WIND TURBINE DESIGN LOADS IN DIFFERENT ENVIRONMENTS USING INVERSE, Austin, TX 78712 ABSTRACT* The influence of turbulence conditions on the design loads for wind turbines

  5. BAYESIAN UPDATING OF PROBABILISTIC TIME-DEPENDENT FATIGUE MODEL: APPLICATION TO JACKET FOUNDATIONS OF WIND TURBINES

    E-Print Network [OSTI]

    Boyer, Edmond

    OF WIND TURBINES Benjamin Rocher1,2 , Franck Schoefs1 , Marc François1 , Arnaud Salou2 1 LUNAM Université.rocher@univ-nantes.fr ABSTRACT Due to both wave and wind fluctuation, the metal foundations of offshore wind turbines are highly algorithm. KEYWORDS: Fatigue, Damage, Reliability, Bayesian updating. INTRODUCTION In offshore wind turbines

  6. Ris-R-Report Grid fault and design-basis for wind turbines -

    E-Print Network [OSTI]

    Risø-R-Report Grid fault and design-basis for wind turbines - Final report Anca D. Hansen, Nicolaos and design-basis for wind turbines - Final report Division: Wind Energy Division Risø-R-1714(EN) January 2010-basis for wind turbines". The objective of this project has been to assess and analyze the consequences

  7. Ris-R-1000(EN) Cost Optimization of Wind Turbines for

    E-Print Network [OSTI]

    Risø-R-1000(EN) Cost Optimization of Wind Turbines for Large-scale Off-shore Wind Farms Peter contains a preliminary investigation of site specific design of off- shore wind turbines for a large off using a design tool for wind turbines that involve numerical optimization and aeroelastic calculations

  8. Mitigation of Fatigue Loads Using Individual Pitch Control of Wind Turbines Based on FAST

    E-Print Network [OSTI]

    Chen, Zhe

    Mitigation of Fatigue Loads Using Individual Pitch Control of Wind Turbines Based on FAST Yunqian University, China jiz@seu.edu.cn Abstract-With the increase of wind turbine dimension and capacity, the wind turbine structures are subjected to prominent loads and fatigue which would reduce the lifetime of wind

  9. An Experimental Investigation on the Wake Interference of Wind Turbines Sited Over Complex Terrains

    E-Print Network [OSTI]

    Hu, Hui

    1 An Experimental Investigation on the Wake Interference of Wind Turbines Sited Over Complex, 50011 An experimental study was conducted to investigate the interferences of wind turbines sited over conducted in a large wind tunnel with of wind turbine models sited over a flat terrain (baseline case

  10. Set-point reconfiguration approach for the FTC of wind turbines

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Set-point reconfiguration approach for the FTC of wind turbines B. Boussaid C. Aubrun N system stability. The effectiveness of the proposed solution is illustrated by a wind turbine example issue. Nowadays, wind turbines which generate electrical energy from the wind energy are considered one

  11. Multi-Fidelity Uncertainty Quantification: Application to a Vertical Axis Wind Turbine Under an

    E-Print Network [OSTI]

    Alonso, Juan J.

    Multi-Fidelity Uncertainty Quantification: Application to a Vertical Axis Wind Turbine Under, USA Designing better vertical axis wind turbines (VAWTs) requires considering the uncertain wind cost. Low-fidelity tools are used extensively in the modeling of vertical axis wind turbines (VAWTs)3

  12. Operational risk of a wind farm energy production by Extreme Value Theory and Copulas

    E-Print Network [OSTI]

    D'Amico, Guglielmo; Prattico, Flavio

    2014-01-01

    In this paper we use risk management techniques to evaluate the potential effects of those operational risks that affect the energy production of a wind farm. We concentrate our attention on three major risk factors: wind speed uncertainty, wind turbine reliability and interactions of wind turbines due mainly to their placement. As a first contribution, we show that the Weibull distribution, commonly used to fit recorded wind speed data, underestimates rare events. Therefore, in order to achieve a better estimation of the tail of the wind speed distribution, we advance a Generalized Pareto distribution. The wind turbines reliability is considered by modeling the failures events as a compound Poisson process. Finally, the use of Copula able us to consider the correlation between wind turbines that compose the wind farm. Once this procedure is set up, we show a sensitivity analysis and we also compare the results from the proposed procedure with those obtained by ignoring the aforementioned risk factors.

  13. An experimental and numerical study of wind turbine seismic behavior

    E-Print Network [OSTI]

    Prowell, I.

    2011-01-01

    Figure 1.1: White Water Wind Farm located near Palm Springs,testing at their active wind farm near Mojave, California.It is imperative that wind farms remain in operation

  14. Methods and apparatus for cooling wind turbine generators

    DOE Patents [OSTI]

    Salamah, Samir A. (Niskayuna, NY); Gadre, Aniruddha Dattatraya (Rexford, NY); Garg, Jivtesh (Schenectady, NY); Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Alplaus, NY); Carl, Jr., Ralph James (Clifton Park, NY)

    2008-10-28

    A wind turbine generator includes a stator having a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis. A rotor is rotatable about the generator longitudinal axis, and the rotor includes a plurality of magnetic elements coupled to the rotor and cooperating with the stator windings. The magnetic elements are configured to generate a magnetic field and the stator windings are configured to interact with the magnetic field to generate a voltage in the stator windings. A heat pipe assembly thermally engaging one of the stator and the rotor to dissipate heat generated in the stator or rotor.

  15. Interagency Field Test Evaluates Co-operation of Turbines and...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Interagency Field Test Evaluates Co-operation of Turbines and Radar Interagency Field Test Evaluates Co-operation of Turbines and Radar May 1, 2012 - 2:56pm Addthis The Department...

  16. Structural health and prognostics management for offshore wind turbines : an initial roadmap.

    SciTech Connect (OSTI)

    Griffith, Daniel Todd; Resor, Brian Ray; White, Jonathan Randall; Paquette, Joshua A.; Yoder, Nathanael C.

    2012-12-01

    Operations and maintenance costs for offshore wind plants are expected to be significantly higher than the current costs for onshore plants. One way in which these costs may be able to be reduced is through the use of a structural health and prognostic management system as part of a condition based maintenance paradigm with smart load management. To facilitate the creation of such a system a multiscale modeling approach has been developed to identify how the underlying physics of the system are affected by the presence of damage and how these changes manifest themselves in the operational response of a full turbine. The developed methodology was used to investigate the effects of a candidate blade damage feature, a trailing edge disbond, on a 5-MW offshore wind turbine and the measurements that demonstrated the highest sensitivity to the damage were the local pitching moments around the disbond. The multiscale method demonstrated that these changes were caused by a local decrease in the blade's torsional stiffness due to the disbond, which also resulted in changes in the blade's local strain field. Full turbine simulations were also used to demonstrate that derating the turbine power by as little as 5% could extend the fatigue life of a blade by as much as a factor of 3. The integration of the health monitoring information, conceptual repair cost versus damage size information, and this load management methodology provides an initial roadmap for reducing operations and maintenance costs for offshore wind farms while increasing turbine availability and overall profit.

  17. Comparison of financing costs for wind turbine and fossil powerplants

    SciTech Connect (OSTI)

    Kahn, E.

    1995-02-01

    This paper compares the financing costs of wind turbine powerplants with those of fossil powerplants. The goal of this examination is to determine the extent to which these costs differ and what the sources of such differences may be. The discussion is organized in the following fashion. Section 2 introduces basic terminology and concepts from finance, as they apply in the powerplant setting. Section 3 reviews available data from a variety of sources to estimate the magnitude of the variables identified in Section 2. In Section 4 we examine the effect of the production tax credit enacted in the Energy Policy Act of 1992 on the financing of wind turbine projects. Conclusions are offered in Section 5. In the past two years there have been only two wind turbine projects that have been financed, so the basis for broad conclusions is limited. Nonetheless, there appears to be a significant advantage in financing costs for conventional projects compared to wind turbines. The two sources of disadvantage to wind power are first, the cost of equity capital is significantly more expensive, and second, the capital structure of wind projects has a much greater fraction of expensive equity than conventional alternatives.

  18. Wind turbine with automatic pitch and yaw control

    DOE Patents [OSTI]

    Cheney, Jr., Marvin Chapin (Glastonbury, CT); Spierings, Petrus A. M. (Middletown, CT)

    1978-01-01

    A wind turbine having a flexible central beam member supporting aerodynamic blades at opposite ends thereof and fabricated of uni-directional high tensile strength material bonded together into beam form so that the beam is lightweight, and has high tensile strength to carry the blade centrifugal loads, low shear modulus to permit torsional twisting thereof for turbine speed control purposes, and adequate bending stiffness to permit out-of-plane deflection thereof for turbine yard control purposes. A selectively off-set weighted pendulum member is pivotally connected to the turbine and connected to the beam or blade so as to cause torsional twisting thereof in response to centrifugal loading of the pendulum member for turbine speed control purposes.

  19. SHM of wind turbine blades using piezoelectric active-sensors

    SciTech Connect (OSTI)

    Park, Gyuhae [Los Alamos National Laboratory; Taylor, Stuart G [Los Alamos National Laboratory; Farinholt, Kevin M [Los Alamos National Laboratory; Farrar, Charles R [Los Alamos National Laboratory

    2010-01-01

    This paper presents a variety of structural health monitoring (SHM) techniques, based on the use of piezoelectric active-sensors, used to determine the structural integrity of wind turbine blades. Specifically, Lamb wave propagations, frequency response functions, and time series based methods are utilized to estimate the condition of wind turbine blades. For experiments, a 1m section of a 9m CX100 blade is used. Overall, these three methods yielded a sufficient damage detection capability to warrant further investigation into field deployment. A full-scale fatigue test of a CX-100 wind turbine blade is also conducted. This paper summarizes considerations needed to design such SHM systems, experimental procedures and results, and practical implementation issues that can be used as guidelines for future investigations.

  20. Quiet airfoils for small and large wind turbines

    DOE Patents [OSTI]

    Tangler, James L. (Boulder, CO); Somers, Dan L. (Port Matilda, PA)

    2012-06-12

    Thick airfoil families with desirable aerodynamic performance with minimal airfoil induced noise. The airfoil families are suitable for a variety of wind turbine designs and are particularly well-suited for use with horizontal axis wind turbines (HAWTs) with constant or variable speed using pitch and/or stall control. In exemplary embodiments, a first family of three thick airfoils is provided for use with small wind turbines and second family of three thick airfoils is provided for use with very large machines, e.g., an airfoil defined for each of three blade radial stations or blade portions defined along the length of a blade. Each of the families is designed to provide a high maximum lift coefficient or high lift, to exhibit docile stalls, to be relatively insensitive to roughness, and to achieve a low profile drag.

  1. Low Wind Speed Turbine Development Project Report: November 4, 2002 - December 31, 2006

    SciTech Connect (OSTI)

    Mikhail, A.

    2009-01-01

    This report summarizes work conducted by Clipper Windpower under the DOE Low Wind Speed Turbine project. The objective of this project was to produce a wind turbine that can lower the cost of energy.

  2. DOE-Funded Project Develops Safer Access to Offshore Wind Turbine...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    DOE-Funded Project Develops Safer Access to Offshore Wind Turbine Platforms DOE-Funded Project Develops Safer Access to Offshore Wind Turbine Platforms September 10, 2015 - 6:21pm...

  3. Photo of the Week: Argonne's 10 kW Wind Turbine | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Photo of the Week: Argonne's 10 kW Wind Turbine Photo of the Week: Argonne's 10 kW Wind Turbine November 9, 2012 - 11:57am Addthis At Argonne National Laboratory, the power...

  4. AWEA O&M Recommended Practices Series Part VII: Wind Turbine...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AWEA O&M Recommended Practices Series Part VII: Wind Turbine Gear Lubricant Flushing Procedures AWEA O&M Recommended Practices Series Part VII: Wind Turbine Gear Lubricant Flushing...

  5. Coordination of Voltage and Frequency Feedback in Load-Frequency Control Capability of Wind Turbine

    E-Print Network [OSTI]

    Silva, Filipe Faria Da

    Coordination of Voltage and Frequency Feedback in Load-Frequency Control Capability of Wind Turbine-Frequency Control (LFC) is gradually shifted to Variable Speed Wind Turbines (VSWTs). In order to equip VSWT

  6. Advanced Control Design for Wind Turbines; Part I: Control Design, Implementation, and Initial Tests

    SciTech Connect (OSTI)

    Wright, A. D.; Fingersh, L. J.

    2008-03-01

    The purpose of this report is to give wind turbine engineers information and examples of the design, testing through simulation, field implementation, and field testing of advanced wind turbine controls.

  7. Wind Turbine Gearbox Failure Modes - A Brief (Presentation)

    SciTech Connect (OSTI)

    Sheng, S.; McDade, M.; Errichello, R.

    2011-10-01

    Wind turbine gearboxes are not always meeting 20-year design life. Premature failure of gearboxes increases cost of energy, turbine downtime, unplanned maintenance, gearbox replacement and rebuild, and increased warranty reserves. The problem is widespread, affects most Original Equipment Manufacturers, and is not caused by manufacturing practices. There is a need to improve gearbox reliability and reduce turbine downtime. The topics of this presentation are: GRC (Gearbox Reliability Collaborative) technical approach; Gearbox failure database; Recorded incidents summary; Top failure modes for bearings; Top failure modes for gears; GRC test gearbox; Bearing nomenclature; Test history; Real damage; Gear sets; Bearings; Observations; and Summary. 5 refs.

  8. Simulation of winds as seen by a rotating vertical axis wind turbine blade

    SciTech Connect (OSTI)

    George, R.L.

    1984-02-01

    The objective of this report is to provide turbulent wind analyses relevant to the design and testing of Vertical Axis Wind Turbines (VAWT). A technique was developed for utilizing high-speed turbulence wind data from a line of seven anemometers at a single level to simulate the wind seen by a rotating VAWT blade. Twelve data cases, representing a range of wind speeds and stability classes, were selected from the large volume of data available from the Clayton, New Mexico, Vertical Plane Array (VPA) project. Simulations were run of the rotationally sampled wind speed relative to the earth, as well as the tangential and radial wind speeds, which are relative to the rotating wind turbine blade. Spectral analysis is used to compare and assess wind simulations from the different wind regimes, as well as from alternate wind measurement techniques. The variance in the wind speed at frequencies at or above the blade rotation rate is computed for all cases, and is used to quantitatively compare the VAWT simulations with Horizontal Axis Wind Turbine (HAWT) simulations. Qualitative comparisons are also made with direct wind measurements from a VAWT blade.

  9. Synergistic Effects of Turbine Wakes and Atmospheric Stability on Power Production at an Onshore Wind Farm

    SciTech Connect (OSTI)

    Wharton, S; Lundquist, J K; Marjanovic, N

    2012-01-25

    This report examines the complex interactions between atmospheric stability and turbine-induced wakes on downwind turbine wind speed and power production at a West Coast North American multi-MW wind farm. Wakes are generated when the upwind flow field is distorted by the mechanical movement of the wind turbine blades. This has two consequences for downwind turbines: (1) the downwind turbine encounters wind flows with reduced velocity and (2) the downwind turbine encounters increased turbulence across multiple length scales via mechanical turbulence production by the upwind turbine. This increase in turbulence on top of ambient levels may increase aerodynamic fatigue loads on the blades and reduce the lifetime of turbine component parts. Furthermore, ambient atmospheric conditions, including atmospheric stability, i.e., thermal stratification in the lower boundary layer, play an important role in wake dissipation. Higher levels of ambient turbulence (i.e., a convective or unstable boundary layer) lead to higher turbulent mixing in the wake and a faster recovery in the velocity flow field downwind of a turbine. Lower levels of ambient turbulence, as in a stable boundary layer, will lead to more persistent wakes. The wake of a wind turbine can be divided into two regions: the near wake and far wake, as illustrated in Figure 1. The near wake is formed when the turbine structure alters the shape of the flow field and usually persists one rotor diameter (D) downstream. The difference between the air inside and outside of the near wake results in a shear layer. This shear layer thickens as it moves downstream and forms turbulent eddies of multiple length scales. As the wake travels downstream, it expands depending on the level of ambient turbulence and meanders (i.e., travels in non-uniform path). Schepers estimates that the wake is fully expanded at a distance of 2.25 D and the far wake region begins at 2-5 D downstream. The actual distance traveled before the wake recovers to its inflow velocity is dependent on the amount ambient turbulence, the amount of wind shear, and topographical and structural effects. The maximum velocity deficit is estimated to occur at 1-2 D but can be longer under low levels of ambient turbulence. Our understanding of turbine wakes comes from wind tunnel experiments, field experiments, numerical simulations, and from studies utilizing both experimental and modeling methods. It is well documented that downwind turbines in multi-Megawatt wind farms often produce less power than upwind turbine rows. These wake-induced power losses have been estimated from 5% to up to 40% depending on the turbine operating settings (e.g., thrust coefficient), number of turbine rows, turbine size (e.g., rotor diameter and hub-height), wind farm terrain, and atmospheric flow conditions (e.g., ambient wind speed, turbulence, and atmospheric stability). Early work by Elliott and Cadogan suggested that power data for different turbulent conditions be segregated to distinguish the effects of turbulence on wind farm power production. This may be especially important for downwind turbines within wind farms, as chaotic and turbulent wake flows increase stress on downstream turbines. Impacts of stability on turbine wakes and power production have been examined for a flat terrain, moderate size (43 turbines) wind farm in Minnesota and for an offshore, 80 turbine wind farm off the coast of Denmark. Conzemius found it difficult to distinguish wakes (i.e., downwind velocity deficits) when the atmosphere was convective as large amounts of scatter were present in the turbine nacelle wind speed data. This suggested that high levels of turbulence broke-up the wake via large buoyancy effects, which are generally on the order of 1 km in size. On the other hand, they found pronounced wake effects when the atmosphere was very stable and turbulence was either suppressed or the length scale was reduced as turbulence in this case was mechanically produced (i.e., friction forces). This led to larger reductions at downwind turbines and maximum ve

  10. Dynamic response analysis of a 900 kW wind turbine subject to ground excitation

    E-Print Network [OSTI]

    Caudillo, Adrian Felix

    2012-01-01

    1.1 Wind Energy and Earthquake Activity 1.2 Brief LiteratureNorsk Veritas, Copen- hagen and Wind Energy Department, Risøpowered by wind energy, wind turbines themselves still

  11. Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    consequent impacts on wind turbine and wind energy pricing.A. Zervos. 2011a. “Wind Energy. ” In IPCC Special Report onReferences American Wind Energy Association (AWEA). 2011.

  12. FRACTURE OF SKIN-STIFFENER INTERSECTIONS IN COMPOSITE WIND TURBINE BLADE STRUCTURES

    E-Print Network [OSTI]

    FRACTURE OF SKIN-STIFFENER INTERSECTIONS IN COMPOSITE WIND TURBINE BLADE STRUCTURES by Darrin John..................................................................4 Stiffener Design Considerations

  13. EA-1857: Wind Turbine Power Generation Complex at Idaho National Laboratory

    Broader source: Energy.gov [DOE]

    This EA would evaluate the environmental impacts of the proposed wind turbine power generation complex at Idaho National Laboratory, Idaho.

  14. Aalborg Universitet Wind Turbine Control Impact on Stability of Wind Farms Based on Real-Life Systems

    E-Print Network [OSTI]

    Bak, Claus Leth

    farms. Keywords: offshore wind farms, stability analysis, stability margins, wind farm aggregation, wind used in large offshore wind farms. This affects the significant increase of complexity in wind farmAalborg Universitet Wind Turbine Control Impact on Stability of Wind Farms Based on Real

  15. Torque ripple in a Darrieus, vertical axis wind turbine

    SciTech Connect (OSTI)

    Reuter, R.C. Jr.

    1980-09-01

    Interaction between a steady wind and a rotating, Darrieus, vertical axis wind turbine produces time periodic aerodynamic loads which cause time dependent torque variations, referred to as torque ripple, to occur in the mechanical link between the turbine and the electrical generator. There is concern for the effect of torque ripple upon fatigue life of drive train components and upon power quality. An analytical solution characterizing the phenomenon of torque ripple has been obtained which is based upon a Fourier expansion of the time dependent features of the problem. Numerical results for torque ripple, some experimental data, determination of acceptable levels and methods of controlling it, are presented and discussed.

  16. 66 APRIL | 2010 The FuTure oF Wind Turbine

    E-Print Network [OSTI]

    Kusiak, Andrew

    in the form of large-scale wind farms, wind energy cooperatives, wind turbines owned by indi- vidual investors66 APRIL | 2010 The FuTure oF Wind Turbine diagnosTics Wind energy is undergoing expansion, and multinational exploration of remote sites and offshore locations. Despite the in- creasing rated capacity

  17. Simulating Turbulent Wind Fields for Offshore Turbines in Hurricane-Prone Regions (Poster)

    SciTech Connect (OSTI)

    Guo, Y.; Damiani, R.; Musial, W.

    2014-04-01

    Extreme wind load cases are one of the most important external conditions in the design of offshore wind turbines in hurricane prone regions. Furthermore, in these areas, the increase in load with storm return-period is higher than in extra-tropical regions. However, current standards have limited information on the appropriate models to simulate wind loads from hurricanes. This study investigates turbulent wind models for load analysis of offshore wind turbines subjected to hurricane conditions. Suggested extreme wind models in IEC 61400-3 and API/ABS (a widely-used standard in oil and gas industry) are investigated. The present study further examines the wind turbine response subjected to Hurricane wind loads. Three-dimensional wind simulator, TurbSim, is modified to include the API wind model. Wind fields simulated using IEC and API wind models are used for an offshore wind turbine model established in FAST to calculate turbine loads and response.

  18. Method for computing efficient electrical indicators for offshore wind turbine monitoring

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    by offshore deployment of wind farms. The offshore turbines have much lower accessibility(1) so maintenanceMethod for computing efficient electrical indicators for offshore wind turbine monitoring Georgia.cablea, pierre.granjon, christophe.berenguer} @gipsa-lab.grenoble-inp.fr Abstract Offshore wind turbines

  19. Optimization of wind turbine energy and power factor with an evolutionary computation algorithm

    E-Print Network [OSTI]

    Kusiak, Andrew

    Optimization of wind turbine energy and power factor with an evolutionary computation algorithm 2009 Keywords: Wind turbine Power factor Power output Power quality Data mining Neural network Dynamic computation approach for optimization of power factor and power output of wind turbines is discussed. Data

  20. APPROPRIATE REALISATION OF GAIN-SCHEDULED CONTROLLERS WITH APPLICATION TO WIND TURBINE REGULATION

    E-Print Network [OSTI]

    Duffy, Ken

    1 1QE, U.K. Abstract Power regulation of horizontal-axis grid-connected up-wind constant-speed pitch of wind turbine technology. The standard commercial design of turbine is a horizontal-axis grid that the next generation of wind turbines which are presently being developed will include large-scale designs

  1. 3-D Time-Accurate CFD Simulations of Wind Turbine Rotor Flow Fields

    E-Print Network [OSTI]

    -dimensional flow properties of rotating blades are an essential feature of any wind turbine aerodynamic-rotating simulations, some aspects of the physics of wind turbine aerodynamics and noise must be obtained from rotating3-D Time-Accurate CFD Simulations of Wind Turbine Rotor Flow Fields Nilay Sezer-Uzol and Lyle N

  2. Impedance Spectroscopy Failure Diagnosis of a DFIG-Based Wind Turbine

    E-Print Network [OSTI]

    Brest, Université de

    Impedance Spectroscopy Failure Diagnosis of a DFIG-Based Wind Turbine Mohamed Becherif, Assia Henni, Mohamed Benbouzid and Maxime Wack Abstract-Wind turbines proliferation in industrial and residential of the grounding connection, short circuit and stator resistance variation. Index Terms-Wind turbine, doubly

  3. STRUCTURAL HEALTH MONITORING OF THE SUPPORT STRUCTURE OF WIND TURBINE USING WIRELESS SENSING SYSTEM

    E-Print Network [OSTI]

    Boyer, Edmond

    STRUCTURAL HEALTH MONITORING OF THE SUPPORT STRUCTURE OF WIND TURBINE USING WIRELESS SENSING SYSTEM, Taiwan kclu@narlabs.org.tw ABSTRACT The wind turbine heavily depends on the success of the support structure to resist the complicated environmental loading, especially for the offshore wind turbine. How

  4. DEVELOPMENT OF AN ULTRASONIC NDT SYSTEM FOR AUTOMATED IN-SITU INSPECTION OF WIND TURBINE BLADES

    E-Print Network [OSTI]

    Boyer, Edmond

    DEVELOPMENT OF AN ULTRASONIC NDT SYSTEM FOR AUTOMATED IN- SITU INSPECTION OF WIND TURBINE BLADES Abington, Cambridge, CB21 6AL, UK bic@brunel.ac.uk ABSTRACT It is crucial to maintain wind turbine blades. This work investigates using pulse-echo ultrasound to detect internal damages in wind turbine blades without

  5. Incorporating Irregular Nonlinear Waves in Coupled Simulation of Offshore Wind Turbines

    E-Print Network [OSTI]

    Manuel, Lance

    Incorporating Irregular Nonlinear Waves in Coupled Simulation of Offshore Wind Turbines Puneet, and Environmental Engineering The University of Texas, Austin, TX 78712 Design of an offshore wind turbine requires on the support structure (monopile) of an offshore wind turbine. We present the theory for the irregular

  6. American Institute of Aeronautics and Astronautics Foundation Models for Offshore Wind Turbines

    E-Print Network [OSTI]

    Manuel, Lance

    American Institute of Aeronautics and Astronautics 1 Foundation Models for Offshore Wind Turbines of alternative models for monopile pile foundations for shallow-water offshore wind turbines has on extreme loads) is the most common type of foundation used today for offshore wind turbines; the support structure connects

  7. 1 Copyright 2007 by ASME SIMULATION OF OFFSHORE WIND TURBINE RESPONSE FOR

    E-Print Network [OSTI]

    Manuel, Lance

    1 Copyright © 2007 by ASME SIMULATION OF OFFSHORE WIND TURBINE RESPONSE FOR EXTREME LIMIT STATES P loads for an offshore wind turbine using simulation, statistical extrapolation is the method of choice in the design of offshore wind turbines against ultimate limit states, and a recent draft [1] of design

  8. "Development of a Free Vortex Wake Method Code for Offshore Floating Wind Turbines"

    E-Print Network [OSTI]

    Mountziaris, T. J.

    "Development of a Free Vortex Wake Method Code for Offshore Floating Wind Turbines" Andrew Sciotti Professor Matthew Lackner Shujian Liu Offshore floating wind turbines (OFWTs) require a unique aerodynamic in refining current mathematical models of offshore wind turbines while also allowing efficient simulations

  9. A Control Methodology to Mitigate the Grid Impact of Wind Turbines

    E-Print Network [OSTI]

    Maggiore, Manfredi

    A Control Methodology to Mitigate the Grid Impact of Wind Turbines Barry G. Rawn, Student Member a new control topology for converter-interfaced wind turbines. Through a singular perturbation decom the power grid. Specifically, the controller causes the closed-loop wind turbine to behave as a simple first

  10. AIAA-98-0057 RELATING TURBULENCE TO WIND TURBINE BLADE LOADS

    E-Print Network [OSTI]

    Sweetman, Bert

    AIAA-98-0057 RELATING TURBULENCE TO WIND TURBINE BLADE LOADS: PARAMETRIC STUDY WITH MULTIPLE that is most useful in estimating fatigue loads on wind turbine blades. The histograms of rain ow counted for apwise loads on three horizontal axis wind tur- binesHAWTs. In the case of two of these turbines

  11. A Comparison of Wind Turbine Load Statistics for Inflow Turbulence Fields based on Conventional

    E-Print Network [OSTI]

    Manuel, Lance

    A Comparison of Wind Turbine Load Statistics for Inflow Turbulence Fields based on Conventional for a utility-scale 5MW wind turbine. Load statistics, spectra, and time-frequency analysis representations utility-scale wind turbines. The present study takes on this question by making use of conventional

  12. Manufacturing Defects Common to Composite Wind Turbine Blades: Effects of Defects

    E-Print Network [OSTI]

    1 Manufacturing Defects Common to Composite Wind Turbine Blades: Effects of Defects Jared W. Nelson The Blade Reliability Collaborative has been formed to perform comprehensive studies to improve wind turbine uni-directional wind turbine fiber-reinforced composite material with an epoxy resin were utilized

  13. On the Study of Uncertainty in Inflow Turbulence Model Parameters in Wind Turbine Applications

    E-Print Network [OSTI]

    Manuel, Lance

    On the Study of Uncertainty in Inflow Turbulence Model Parameters in Wind Turbine Applications Korn, Austin, TX 78712 In stochastic simulation of inflow turbulence random fields for wind turbine applica variables forms the basis of this study. A commercial-sized 1.5MW concept wind turbine is considered

  14. On the use of proper orthogonal decomposition to describe inflow turbulence and wind turbine loads

    E-Print Network [OSTI]

    Manuel, Lance

    On the use of proper orthogonal decomposition to describe inflow turbulence and wind turbine loads, USA Keywords: Proper Orthogonal Decomposition, inflow turbulence, wind turbine ABSTRACT: We discuss experienced by a wind turbine. A methodology is proposed that employs low- dimensional POD models

  15. EFFECT OF MEAN STRESS ON THE DAMAGE OF WIND TURBINE BLADES* Herbert J. Sutherland

    E-Print Network [OSTI]

    1 EFFECT OF MEAN STRESS ON THE DAMAGE OF WIND TURBINE BLADES* Herbert J. Sutherland Sandia National, MT 59717 johnm@coe.montana.edu ABSTRACT In many analyses of composite wind turbine blades in wind turbine blades has been released recently. This diagram, which is based on the MSU/DOE Fatigue

  16. Blue Ribbon Panel on Development of Wind Turbine Facilities in Coastal Waters

    E-Print Network [OSTI]

    Firestone, Jeremy

    #12;ii #12;iii Blue Ribbon Panel on Development of Wind Turbine Facilities in Coastal Waters on Development of Wind Turbine Facilities in Coastal Waters. Last December, Governor Codey signed his twelfth of developing offshore wind turbine facilities." This interim report represents our progress to date toward

  17. AIAA-2003-0694 QUANTIFICATION OF PROCESSING PARAMETERS FOR WIND TURBINE

    E-Print Network [OSTI]

    AIAA-2003-0694 QUANTIFICATION OF PROCESSING PARAMETERS FOR WIND TURBINE BLADES Douglas Cairns, John of processing techniques and can be useful to wind turbine blade manufacturers to prepare processing conditions-3]. This is a consequence of the typical material architectures that are used in wind turbine blades. Figure 1

  18. EXPERIMENTS ON A SCALE MODEL OF A MONOLITHIC CONCRETE SPAR FOR FLOATING WIND TURBINES

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    Politècnica de Catalunya, Universitat

    EXPERIMENTS ON A SCALE MODEL OF A MONOLITHIC CONCRETE SPAR FOR FLOATING WIND TURBINES Alexis Campos device, simulating the mean thrust force exerted by the wind turbine. To adjust the weight of the whole floating offshore wind turbines substructures. Preliminary studies of a concept consisting of a monolithic

  19. Aalborg Universitet Disturbance Control of the Hydraulic Brake in a Wind Turbine

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    Yang, Zhenyu

    Aalborg Universitet Disturbance Control of the Hydraulic Brake in a Wind Turbine Jepsen, Frank Brake in a Wind Turbine. In Energy Conference and Exhibition (EnergyCon), 2010 IEEE International . (pp from vbn.aau.dk on: juli 07, 2015 #12;Disturbance Control of the Hydraulic Brake in a Wind Turbine

  20. Wind turbine amplitude modulation: research to improve understanding as to its cause & effect

    E-Print Network [OSTI]

    Boyer, Edmond

    Wind turbine amplitude modulation: research to improve understanding as to its cause & effect M. M-27 April 2012, Nantes, France 811 #12;of wind turbines is presently receiving a high focus of attention. Whilst the acceptability of audible noise from wind turbines continues to be the subject of considerable