CFARS - Science Working Group Update March 06,

CFARS - Science Working Group Update March 06,

CFARS - Science Working Group Update March 06, 2019 Alexandra St. P, E.ON ([email protected]) Science WG Topic Prioritization March 2018 Impact Complex Flow Correction Uncertainty/ Energy Evaluation

Power Curves / PPTs Site Suitability (TI & Shear) Effort Mission - Provide data-driven answers to key RSD science questions and support the development pragmatic solutions to hurdles that hinder the acceptance of RSD use 2 Science WG Subgroups & Leads Science Working Group Complex Flow Correction (CFC)

Power Curves / PPTs Niels Lawhite ([email protected]) Site Suitability (SS) Alexandra St. P ([email protected]) Uncertainty/ Energy Evaluation Volunteer welcomed!

Reesa Dexter ([email protected]) 3 CFARS - Science CFC Subgroup Complex Flow Correction March 06, 2019 Niels LaWhite, Vaisala ([email protected]) Complex Flow Correction - Bias Correction for Complex Terrain Bias is caused by inhomogeneity between RSD beams, i.e. curved flow RSD wind reconstruction math assumes the wind vector is constant between beams Curvature induced bias is a well known, major issue large bias, high uncertainty Forward scanning RSD bias induced by changes in horizontal wind direction Upward facing RSD bias induced by changes in vertical wind direction, e.g. hilltop/ridge

Characteristics for ground based RSD in complex terrain Flow over hilltop leads to low bias (underprediction of wind speeds) Varies with wind direction AND measurement height Roughly independent of technology, beam configuration, and tilt angle Bias can be corrected if flow curvature is known commercial products are available CFD based models predict flow curvature over terrain, no real-time data necessary FCR (Windcube) uses real-time data to estimate and correct bias Complex Flow Correction (CFC) is very important for RSD use in complex terrain! 5 CFARS Science CFC Subgroup Support increased use of RSD in complex terrain Show typical flow curvature biases for different terrains Validate commercially available bias correction methods Explore limitations in correction technology stability, high roughness, detached flow Evaluate correction uncertainty as a function of site and measurement height Demonstrate the value in correcting RSD measurements

Subgroup Status Project kick-off (skype/zoom meeting) in roughly 2 weeks Roadmap will be decided based on survey results (+new ideas!) Validation study, uncertainty analysis, comparison of commercial correction offerings, or white paper on theory with terrain type / bias classification. Interested? We are looking for participants! (contact: [email protected]) 6 CFARS Science Subgroup: Site Suitability March 06, 2019 Alexandra St. P, E.ON ([email protected])

Science WG - Site Suitability Subgroup Focus Turbulence Intensity Turbulent wind produces excessive turbine loads and fatigue Reduction in turbine performance and yield Increase O&M costs Decrease turbine lifespan IEC 61400-1 standard wind turbine classification defined by wind speed & TI Accurate measurement of TI is mandatory as variation between turbine and wind classes are small TI bias load assessment error Load assessment error decrease turbine lifespan Increase O&M costs Decrease turbine lifespan 8

Science WG - Site Suitability Subgroup 2018 Milestone Activities Defining Deliverables & First Results 1 Phase 1 Analysis: TI Bias Benchmarking Q1 2019 - Organizations compare average TI bias between their own collocated, concurrent, datasets: - Raw and Corrected RSD TI vs. Reference Anemometer TI - Reference Anemometer TI vs. Other Anemometer TI vs. & Raw/Corrected

RSD TI 2 Reference Anemometer TI & Reference Anemometer TI Other Anemomet er

Phase 2 Analysis: RSD TI Correction Method Evaluation Q3 2019 - Organizations perform round robin tests of RSD TI correction methods accuracy and precision on their own collocated, concurrent, datasets: - Raw and Corrected RSD TI vs. Reference Anemometer TI (truth) & Corrected RSD TI 3 Reference Anemometer TI High Precision & High Accuracy

Baseline Best Practice RSD TI Correction - Develop and align on baseline best practice RSD TI correction method(s) for site suitability and PPTs Methods Q1 2020 assessment 9 CFARS - Science Subgroup: Uncertainty/ Energy Evaluation March 06, 2019 Reesa Dexter, DNV GL ([email protected]) Thank you. Questions?

([email protected]) 11 Extra Slides 12

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