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 will give delegates an opportunity 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 industry and the academic community.
PO209: How Does the Wind Turbine Rotor Affect the Data Availability and Measurement Accuracy of Nacelle-Mounted Lidar (NML)? An Investigation from Simulation and Field Evidence
Aurélie Jeannin, Market Development Manager, Vaisala
Abstract
Wind lidar has become a mature and essential technology in wind energy. In particular, Nacelle-Mounted Lidar (NML) provides accurate, real-time wind measurements at hub height, enabling optimized turbine control, improved power curve verification, and reduced measurement uncertainty. For the wind measurement over a defined time, the data availability is critical for reliable characterization. However, due to periodic blade interference of wind turbine, the data availability of NML differs significantly from that of traditional wind measurement instruments. The Blade Masking Effect (BME), which causes some intermittent signal loss as blades pass through the laser beam, remains insufficiently studied. As noted in IEC 61400-50-3, “Currently, no clear guideline for a fixed availability value is available,” highlighting the need for the investigation on the data availability. The primary motivation of this study is to simulate the interaction between laser beams and rotating blades under realistic operational conditions, and to assess the impact of varying data availability on measurement accuracy. To achieve this, two complementary methods are developed: (1) a MATLAB-based simulation tool that models the actual geometry and enables analysis of beam obstruction, and (2) a data post-processing approach applied to field measurements, providing insight of the influence on the accuracy. The simulation results effectively explain the observed patterns in data availability and support optimization of NML installation strategies. Field measurements show good agreement with simulation outcomes, even under conditions of low data availability. Notably, when data availability is uniformly reduced, the wind speed comparison between NML and Met Mast remains consistent. This study investigates the impact of turbine blades on NML data availability through both simulation and field measurementsand and the influence on accuracy. The findings reveal that blade-induced reductions in data availability does not significantly impact the accuracy of wind measurement, highlighting the possibility of relaxing the threshold when using NML.
No recording available for this poster.
