Wind turbine driving system torsional vibration measurement method and device

Abstract

The invention relates to a wind turbine driving system torsional vibration measurement method and a wind turbine driving system torsional vibration measurement device. The method includes the steps of: synchronously collecting pulse signals of the rotating speed of the front end of a principal shaft of a driving chain and the rotating speed of the tail end of a power generator, and conducting A/D (Analog to Digital) conversion on the signals; calculating the shafting equivalent speed difference of the driving chain; conducting fast Fourier transformation on an equivalent speed difference sequence signal to obtain a frequency domain signal of the equivalent speed difference sequence signal; filtering the frequency domain signal; and working out the torsional angle acceleration and the torsional angle through Fourier differential and integral inverse transformation. The device comprises two rotary encoders which are respectively installed at the front end of the principal shaft and the tail end of the power generator, and a signal processing unit connected with the two rotary encoders. The device disclosed by the invention requires no independent signal acquisition unit and is simple in structure, small in size, stable and reliable in performance, long in service life, and can effectively get rid of noises and interfering signals to obtain accurate shafting torsional angle.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and device for measuring torsional vibration of a wind turbine transmission system. Background technique [0002] The torsional vibration of the shaft system is an important form of vibration. The long-term effect of torsional vibration will cause harm to the shaft and the parts on the shaft, and even cause sudden accidents. The speed of the wind turbine is constantly changing, so the torque of the transmission chain shaft load is also constantly changing. When measuring the torsional vibration of a wind turbine, it is necessary to adapt to the changing speed and torque. Torsional vibration measurement methods for wind turbines are more complex than those for other rotating machinery. [0003] Most of the current torsional vibration measurement techniques are designed for constant speed conditions, such as the strain gauge method, which cannot be applied ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for measuring torsional vibration of a wind power generator drive system, which uses frequency-domain differential and integral algorithms based on threshold filter correction to effectively eliminate noise and interference signals, and obtain accurate shafting torsion angles and shafting torsion accelerations , realize the extraction of dynamic torsional vibration measurement information, solve the current problem of inability to accurately measure dynamic torsional vibration and reduce costs

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