Wind turbine generator wind wheel imbalance identification method and system, and storage medium

Abstract

The invention discloses a wind turbine generator wind wheel imbalance identification method, comprising the steps of: S01, acquiring active power and front, back, left and right vibration variables ofa wind turbine generator, acquiring average values of effective values of the vibration variables in a preset time period, and presetting standard threshold values of the vibration variables under the corresponding active power; S02, performing data switching on the vibration variables under rated power, performing FFT analysis on the data, and extracting a median, an upper quantile and a lower quantile; S03, and judging that a wind wheel is pneumatically unbalanced when the following two conditions are met at the same time, namely, (1) the average values of the effective values of the front,back, left and right vibration variables of the wind turbine generator are greater than the standard threshold values under the corresponding power, and (2) the median is higher than a first preset standard value or the upper quantile is higher than three times of the lower quantile. The invention further correspondingly discloses an identification system corresponding to the identification method, and a storage medium. The wind turbine generator wind wheel imbalance identification method, the wind turbine generator wind wheel imbalance identification system and the storage medium have the advantages of easy and convenient operation, low cost, high precision, good timeliness and the like.

Description

technical field [0001] The invention mainly relates to the technical field of wind power generation, in particular to an identification method system and a storage medium for unbalanced rotors of wind turbines. Background technique [0002] In recent years, with the continuous increase of rated power and blade length of wind turbines, the vibration characteristics of wind turbines have become more and more obvious. At present, it is found that many faults of wind turbines are related to their vibration. The vibration caused by the unbalanced wind rotor has attracted more and more attention from the main engine manufacturers and owners, because the long-term unbalanced wind rotor will not only affect its own dynamic performance, but also It will cause greater damage to other components of the wind turbine, such as damage to the pitch system, yaw system and main bearing. Therefore, it is very important to judge or identify the imbalance of the wind turbine rotor in time and a...

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Problems solved by technology

[0005] Problems or shortcomings of this patent: 1) This patent is only applicable to the control of doubly-fed wind turbines; 2) The patented invention has requirements for data collection. Speed ​​operation, this method has certain limitations for the unbalance detection of wind turbines in actual operation

[0007] Problems or shortcomings of the technology: 1) The patent requires the measurement of the instantaneous value of the vibration acceleration at two axially symmetrical points in the tower, which is difficult to implement or requires additional data acquisition equipment; 2) The instantaneous value of the acceleration is multiplied by the two instantaneous values ​​of the vibration acceleration After summing with the corresponding weight coefficient, its weight coefficient is difficult to determine

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