Wind generating set wind wheel unbalance monitoring method

Abstract

The invention discloses a wind generating set wind wheel unbalance monitoring method. The wind generating set wind wheel unbalance monitoring method comprises the steps of measuring vibration acceleration instantaneous values of two symmetrical points of the axis in a tower; carrying out weighting calculation and fast Fourier transform treatment on the two vibration acceleration instantaneous values to obtain corresponding frequency domain signals; enabling the frequency domain signals to pass through a peak value detector to obtain the instantaneous frequency and the instantaneous amplitude value signal at a vane doubled wind wheel rotating frequency; obtaining the base frequency at the vane doubled wind wheel rotating frequency according to a generator rotating speed signal and a gearbox speed change ratio; comparing the instantaneous frequency with the base frequency to obtain a difference value, giving an alarm and carrying out machine halt if the difference value exceeds a preset error threshold value range, judging whether the instantaneous amplitude value signal is within an amplitude threshold value range or not if the difference value is within the error threshold value range, and giving an alarm and carrying out machine halt if the instantaneous amplitude value signal is without the amplitude threshold value range. Whether unbalance occurs or not is calculated and judged according to vibration acceleration signals measured by a sensor in a cabin. The wind generating set wind wheel unbalance monitoring method is used for generator rotating speed signal checking, wind wheel unbalance monitoring and the like, and safe and effective operation of a set is guaranteed.

Description

technical field [0001] The invention relates to a monitoring system for wind power generation, in particular to a method for monitoring unbalance of a wind wheel of a wind power generating set. Background technique [0002] At present, with the large-scale development of wind turbines, the diameter of wind turbine blades and the swept area of ​​wind rotors are increasing, and the impact of wind shear and tower shadow effect on wind turbines is becoming more and more significant. The wind speed at each point in the rotation plane of the wind rotor is different, and the force on the blades at different positions is also different, resulting in periodic fluctuations in the load of the wind rotor. The unbalanced load of the wind rotor not only endangers the life of the wind rotor, but also further affects the stress of the transmission chain, generator, tower and other components, threatening the safe and stable operation of the wind turbine. In addition, for large-scale grid-c...

AI Technical Summary

Problems solved by technology

The wind speed at each point in the rotation plane of the wind rotor is different, and the force on the blades at different positions is also different, resulting in periodic fluctuations in the load of the wind rotor

The unbalanced load of the wind rotor not only endangers the life of the wind rotor, but also further affects the stress of the transmission chain, generator, tower and other components, threatening the safe and stable operation of the wind turbine

In addition, for large-scale grid-connected units, the aerodynamic load fluctuations caused by wind shear and tower shadow effects have a certain impact on the generator torque, output voltage and power, resulting in a decline in power quality

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