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.
PO134: Measurements and compensation method of the upstream induction zone of large wind turbines using pulsed nacelle-mounted LiDARs
Chunyi Hou, Research & Application Manager, Movelaser
Abstract
Nacelle-mounted lidars (NML) are widely used for power curve validation (PCV) of wind turbines. Due to the turbine effect, the wind speed in front of the rotor decreases and is slower than the free-flow. The IEC-61400-12 standard requires the measurement distance to be over 5 rotor radii(R) in front of the rotor to avoid the turbine effect. With the rapid increase in rotor size, it needs NML with a much longer detection range for PCV. On the other hand, when used for lidar assistant control (LAC) or wind shear estimation, the reduction of wind speed in the induction zone brings more error. Most NMLs used for LAC have a shorter detection range than 5R. These huge amounts of lidars are seldom used for PCV because of the turbine effect. According to former research, the induction zone can be described by simple models. Based on these models, free flow wind speed can be fitted to wind speed in the induction zone. For a certain turbine, this model can be simplified to a few parameters and then can be used for short-term data compensation. Such models have been verified by simulations and small turbines below 100-meter diameter, but there are few results from large turbines, which are the majority now. In our research, multi-gate data from pulsed NMLs up to 750-meter range over 5MW and 170-meter diameter turbines are used to verify the induction zone model and the method for compensating for free-flow wind speed acquisition. And then shows the way to use the compensated wind speed to estimate wind shear, rotor average wind speed (RAWS) and power curve.
No recording available for this poster.
