Identification method and device for wind-generating-set variable pitch abnormality

Abstract

The embodiment of the invention provides an identification method and device for the wind-generating-set variable pitch abnormality. Blade operating parameter signals of a wind generating set are obtained; the operating parameter signals are subjected to fast fourier transformation; the frequency-domain characteristic quantity of the operating parameter signals after fast fourier transformation isextracted; whether the variable pitch abnormality occurs or not is determined according to the frequency-domain characteristic quantity, and according to the frequency-domain characteristics of the operating parameter signals of blades with the variable pitch abnormality, before variable pitch faults of the wind generating set occur, and when the wind generating set is in the variable pitch abnormal state, the variable pitch abnormal state can be rapidly identified, the variable pitch abnormal state can be thus eliminated, damage to key parts such as a variable pitch motor is effectively prevented, and the active power output by the wind generating set is effectively improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of wind power generation, and in particular to a method and device for identifying abnormal pitch of a wind power generating set. Background technique [0002] The pitch control of the wind turbine is a process of determining the pitch speed according to the wind speed, and then adjusting the pitch angle of the blades. The principle of pitch control is as follows: the anemometer on the engine room measures the wind speed and transmits the wind speed information to the tower bottom cabinet. The controller in the tower bottom cabinet analyzes the wind speed information and calculates the required value of the pitch speed The demand value is transmitted to the center box of the hub pitch system, and the center box transmits the demand value of the pitch speed to the three axle boxes, and the axle box adjusts the pitch angle of the blade through the pitch drive according to the demand value...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for identifying abnormal pitch of a wind power generator set, which solves the problem that the pitch change processing method in the prior art cannot identify the abnormal state from an early stage, causing the wind power generating set to run in an abnormal state for a long time and cause wind power Technical problems such as the decrease of active power output by the generator set and the damage of key components such as pitch motors

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