The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform

Santiago Pindado - One of the best experts on this subject based on the ideXlab platform.

  • the cup Anemometer a fundamental meteorological instrument for the wind energy industry research at the idr upm institute
    Sensors, 2014
    Co-Authors: Santiago Pindado, Javier Cubas, Felix Sorribespalmer
    Abstract:

    The results of several research campaigns investigating cup Anemometer performance carried out since 2008 at the IDR/UPM Institute are included in the present paper. Several analysis of large series of calibrations were done by studying the effect of the rotor’s geometry, climatic conditions during calibration, and Anemometers’ ageing. More specific testing campaigns were done regarding the cup Anemometer rotor aerodynamics, and the Anemometer signals. The effect of the rotor’s geometry on the cup Anemometer transfer function has been investigated experimentally and analytically. The analysis of the Anemometer’s output signal as a way of monitoring the Anemometer status is revealed as a promising procedure for detecting anomalies.

  • The Cup Anemometer, a Fundamental Meteorological Instrument for the Wind Energy Industry. Research at the IDR/UPM Institute
    Sensors (Basel Switzerland), 2014
    Co-Authors: Santiago Pindado, Javier Cubas, Félix Sorribes-palmer
    Abstract:

    The results of several research campaigns investigating cup Anemometer performance carried out since 2008 at the IDR/UPM Institute are included in the present paper. Several analysis of large series of calibrations were done by studying the effect of the rotor’s geometry, climatic conditions during calibration, and Anemometers’ ageing. More specific testing campaigns were done regarding the cup Anemometer rotor aerodynamics, and the Anemometer signals. The effect of the rotor’s geometry on the cup Anemometer transfer function has been investigated experimentally and analytically. The analysis of the Anemometer’s output signal as a way of monitoring the Anemometer status is revealed as a promising procedure for detecting anomalies.

  • cup Anemometers loss of performance due to ageing processes and its effect on annual energy production aep estimates
    Energies, 2012
    Co-Authors: Santiago Pindado, A Barrerogil, Alfredo Sanz
    Abstract:

    The deviation of calibration coefficients from five cup Anemometer models over time was analyzed. The analysis was based on a series of laboratory calibrations between January 2001 and August 2010. The analysis was performed on two different groups of Anemometers: (1) Anemometers not used for any industrial purpose (that is, just stored); and (2) Anemometers used in different industrial applications (mainly in the field—or outside—applications like wind farms). Results indicate a loss of performance of the studied Anemometers over time. In the case of the unused Anemometers the degradation shows a clear pattern. In the case of the Anemometers used in the field, the data analyzed also suggest a loss of performance, yet the degradation does not show a clear trend. A recalibration schedule is proposed based on the observed performances variations.

  • Deviation of Cup and Propeller Anemometer Calibration Results with Air Density
    Energies, 2012
    Co-Authors: Santiago Pindado, Alfredo Sanz, Alain Wery
    Abstract:

    The effect of air density variations on the calibration constants of several models of Anemometers has been analyzed. The analysis was based on a series of calibrations between March 2003 and February 2011. Results indicate a linear behavior of both calibration constants with the air density. The effect of changes in air density on the measured wind speed by an Anemometer was also studied. The results suggest that there can be an important deviation of the measured wind speed with changes in air density from the one at which the Anemometer was calibrated, and therefore the need to take this effect into account when calculating wind power estimations

Felix Sorribespalmer - One of the best experts on this subject based on the ideXlab platform.

  • the cup Anemometer a fundamental meteorological instrument for the wind energy industry research at the idr upm institute
    Sensors, 2014
    Co-Authors: Santiago Pindado, Javier Cubas, Felix Sorribespalmer
    Abstract:

    The results of several research campaigns investigating cup Anemometer performance carried out since 2008 at the IDR/UPM Institute are included in the present paper. Several analysis of large series of calibrations were done by studying the effect of the rotor’s geometry, climatic conditions during calibration, and Anemometers’ ageing. More specific testing campaigns were done regarding the cup Anemometer rotor aerodynamics, and the Anemometer signals. The effect of the rotor’s geometry on the cup Anemometer transfer function has been investigated experimentally and analytically. The analysis of the Anemometer’s output signal as a way of monitoring the Anemometer status is revealed as a promising procedure for detecting anomalies.

Edmund A Areas - One of the best experts on this subject based on the ideXlab platform.

Scott J. Schreck - One of the best experts on this subject based on the ideXlab platform.

  • Atmospheric turbulence affects wind turbine nacelle transfer functions
    Wind Energy Science, 2017
    Co-Authors: Clara M St Martin, Andrew Clifton, Gregory S Poulos, Julie K. Lundquist, Scott J. Schreck
    Abstract:

    Abstract. Despite their potential as a valuable source of individual turbine power performance and turbine array energy production optimization information, nacelle-mounted Anemometers have often been neglected because complex flows around the blades and nacelle interfere with their measurements. This work quantitatively explores the accuracy of and potential corrections to nacelle Anemometer measurements to determine the degree to which they may be useful when corrected for these complex flows, particularly for calculating annual energy production (AEP) in the absence of other meteorological data. Using upwind meteorological tower measurements along with nacelle-based measurements from a General Electric (GE) 1.5sle model, we calculate empirical nacelle transfer functions (NTFs) and explore how they are impacted by different atmospheric and turbulence parameters. This work provides guidelines for the use of NTFs for deriving useful wind measurements from nacelle-mounted Anemometers. Corrections to the nacelle Anemometer wind speed measurements can be made with NTFs and used to calculate an AEP that comes within 1 % of an AEP calculated with upwind measurements. We also calculate unique NTFs for different atmospheric conditions defined by temperature stratification as well as turbulence intensity, turbulence kinetic energy, and wind shear. During periods of low stability as defined by the Bulk Richardson number (RB), the nacelle-mounted Anemometer underestimates the upwind wind speed more than during periods of high stability at some wind speed bins below rated speed, leading to a steeper NTF during periods of low stability. Similarly, during periods of high turbulence, the nacelle-mounted Anemometer underestimates the upwind wind speed more than during periods of low turbulence at most wind bins between cut-in and rated wind speed. Based on these results, we suggest different NTFs be calculated for different regimes of atmospheric stability and turbulence for power performance validation purposes.

  • Atmospheric turbulence affects wind turbine nacelle transfer functions
    2016
    Co-Authors: Clara M St Martin, Andrew Clifton, Gregory S Poulos, Julie K. Lundquist, Scott J. Schreck
    Abstract:

    Abstract. Despite their potential as a valuable source of individual turbine power performance and turbine array energy production optimization information, nacelle-mounted Anemometers have often been neglected because complex flows around the blades and nacelle interfere with their measurements. This work quantitatively explores the accuracy of and potential corrections to nacelle Anemometer measurements to determine the degree to which they may be useful when corrected for these complex flows, particularly for calculating annual energy production (AEP) in the absence of other meteorological data. Using upwind meteorological tower measurements along with nacelle-based measurements from a General Electric (GE) 1.5sle model, we calculate empirical nacelle transfer functions (NTFs) and explore how they are impacted by different atmospheric and turbulence parameters. This work provides guidelines for the use of NTFs for deriving useful wind measurements from nacelle-mounted Anemometers. Corrections to the nacelle Anemometer wind speed measurements can be made with NTFs and used to calculate an AEP that comes within 1 % of an AEP calculated with upwind measurements. We also calculate unique NTFs for different atmospheric conditions defined by temperature stratification as well as turbulence intensity, turbulence kinetic energy, and wind shear. During periods of low stability as defined by the Bulk Richardson number (RB), the nacelle-mounted Anemometer underestimates the upwind wind speed more than during periods of high stability at some wind speed bins below rated speed, leading to a more steep NTF during periods of low stability. Similarly, during periods of high turbulence, the nacelle-mounted Anemometer underestimates the upwind wind speed more than during periods of low turbulence at most wind bins between cut-in and rated wind speed. Based on these results, we suggest different NTFs be calculated for different regimes of atmospheric stability and turbulence for power performance validation purposes.

Pedja Mihailovic - One of the best experts on this subject based on the ideXlab platform.

  • temperature compensation of ntc thermistors based Anemometer
    Sensors and Actuators A-physical, 2019
    Co-Authors: Petar Atanasijevic, Pedja Mihailovic
    Abstract:

    Abstract Thermal Anemometers based on self-heated thermistors with negative temperature coefficients are a robust, sensitive and low-cost alternative to standard hot-wire Anemometers in wind turbine characterization and optimization. However, changes in ambient temperature greatly affect the accuracy in wind speed measurements of these devices. In this paper, a temperature compensation method incorporating two thermistors with negative temperature coefficients is experimentally investigated. A temperature compensated Anemometer circuit is proposed. The effectiveness of the implemented temperature compensation method is verified over a span of 16 ℃ for two different air velocities. To account for a possible thermistor mismatch, a correction procedure is proposed and verified. In the end, it is shown that the air temperature can be reconstructed from the uncompensated Anemometer outputs as well.