Senior Project Engineer/Senior Renewable Energy Analyst UL LLC
Presentation Description: With the increasing use of remote sensing devices (RSD) in wind resource assessments, as both stand-alone measurements or in conjunction with on-site measurement masts, there is an increasing need to understand parameters that may influence the results of an RSD calibration. The IEC 61400-12-1, Ed. 2 standard stipulates that each RSD be calibrated with a tall high quality IEC-compliant mast in simple terrain. This paper presents the reproducibility and repeatability of RSD calibrations, along with environmental sensitivities.
UL operates two RSD calibration test sites: at Wehlens in Germany and Canyon, TX. Both sites are IEC 61400-12-1 compliance for RSD calibrations. Results from over 40 calibrations have been assessed statistically to show the repeatability of the tests. Speed deviations between the RSD and the cup anemometers are calculated at a range of heights ranging from 65m to 130m. Results across all calibrations indicate that the deviations tend to be wind speed dependent, positively increasing with decreasing speed. A subset of data has been selected to include only pre- and post-calibration pairs from the same RSD units, ensuring there have been no maintenances performed on the units in the interim. Comparisons of these 16 pre- and post-calibrations are used to assess any changes in RSD calibration results.
Finally, the data from all calibrations has been aggregated into a single dataset representing over 8 years of combined measurements. The results are binned by various environmental variables to identify conditions which could impact the results of a single calibration covering a short time period. The sensitivities are compared to the reported sensitivities in previously published classification reports of the RSD type.
Methodology: The results will form the basis for the presentation, but the presenter would be happy to be part of a panel discussion.