Posters

Abstract

The upcoming modern wind turbines have a clear tendency to increase the rotor diameter, hub height and rated power, and the investment for one individual turbine is increasing. Therefore, the accurate Power Performance Testing (PPT) and the wind field monitoring become critical, especially for the large-scale offshore wind farm. However, given the high financial costs of building a tall or offshore met mast, Nacelle-Mounted Lidar (NML) is a natural solution for PPT thanks to the easy deployment and the accurate wind measurement for the whole rotor area. Wind shear is one key parameter for wind field monitoring, as the big wind shear could reduce the power generation and even lead to safety incidents. IEC 61400-12-1 highlights the importance of the wind shear for the accurate PPT measurement and define the calculation of REWS (Rotor Equivalent Wind Speed). The field evaluations are taken at two operational wind farms in US, comparing the wind shear measurement by NML and Ground-Based Lidar (GBL). The result shows that the correlation coefficient by two devices is very good: 0.9718 and 0.9714 with slopes of 1.040 and 0.984 in two campaigns. The good result proofs wind shear measurement by NML is accurate.