Abstract:  Aiming at the problems of lowfrequency vibration caused by the coupling of rotor and tower of wind turbine, theoretical deduction, simulation verification and field test research of the calculation method of the lowfrequency vibration displacement of the wind turbine nacelle was carried out. First, based on the GNSS-RTK precise positioning technology, the calculation method of the low-frequency vibration displacement of the wind turbine nacelle was deduced. Then, the space operation trajectory of the wind turbine nacelle was built through MATLAB software, and the calculation method was simulated and verified. Finally, a comparison test between GNSS equipment and acceleration sensor was carried out, and the trend and error analysis was carried out between the test results and the theoretical displacement calculated by the Bladed software. The research results show that the deviation between the GNSS-based low-frequency vibration displacement of the nacelle and the simulation setting displacement is in the order of 10-15. It is consistent with the change trend of the theoretical displacement curve, and the error is 2.9%, which is better than the 47.1% error of the acceleration quadratic integration to calculate displacement. In summary, simulation and field tests have verified the correctness and accuracy of this method, which is suitable for long-term monitoring of low-frequency vibration displacement of the nacelle of wind turbines, with high accuracy and low cost.

Key words:  low-frequency vibration displacement; GNSS-RTK precise positioning technology; calculation method;error analysis

WANG Xiao, YU Jia-nan, TANG Bo, et al. Calculation method of low frequency vibration displacement of wind turbine based on GNSS［J］.Journal of Mechanical & Electrical Engineering, 2021,38(8):996-1002，1057.