Posters
Come meet the poster presenters to ask them questions and discuss their work
We would like to invite you to come and see the posters at our upcoming conference. The posters will showcase a diverse range of research topics and provide an opportunity for delegates to engage with the authors and learn more about their work. Whether you are a seasoned researcher or simply curious about the latest developments in your field, we believe that the posters will offer something of interest to everyone. So please, join us at the conference and take advantage of this opportunity to learn and engage with your peers in the academic community. We look forward to seeing you there!
PO186: Nacelle-Mounted Lidar reduce the uncertainty of Power Performance Test by Met Mast: a fully investigation
Frédéric Delbos, Wind Energy Research and Application Manager, Vaisala
Abstract
Nowadays, Nacelle-mounted lidar (NML) technology is increasingly leveraged for Power Performance Test (PPT) and is widely accepted by wind turbine manufactures, certification society and operators. The release of new IEC 61400-50-3 provides the industrial guidelines to use the NML as an IEC-complaint technology. Met masts are traditionally the solution for PPT. However, results from field measurement and simulation increasingly reveals that the anemometer is easily affected by the mast, while the PPT measurement by PPT is less scattered. This study presents the result of a pilot project, and shows the suitability of the system for contractual PPT using NML according to the IEC procedures. This study investigate the setup, data quality, wind speed comparison, and wind speed difference of two devices. Further evaluation of two wind sectors compares the PPT measurements by two devices. The results of field measurement show that the wind speed accuracy of NML is consistent with the Met Mast, the correlation coefficient is 0.994, and the slope and offset by linear regression are 0.979 and 0.084, respectively; the scattering points of PPT by NML are more concentrated, and NML is always measuring the wind speed exactly in front of the wind turbine during the yawing of the wind turbine nacelle, which is better representative of the wind speed. OpenFOAM is used to simulate and compare the wind fields at two locations at multiple wind directions. The results of CFD simulation further proofs the terrain affects the wind field. The AEP range evaluated by Met Mast and NML are respectively [3592h, 4265h] and [3739h, 4252h]. Since the NML dispersion interval for wind speed measurement is included inside the ones of Met Mast, the overall uncertainty of NML is smaller than that of Met Mast. NML has less uncertainty for the measurement of PPT and has higher accuracy.
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