An Adaptive Resonant Speed ​​Control Method Based on Life Estimation

Abstract

An adaptive resonance speed control method based on life assessment, which processes the vibration data to obtain the vibration magnitude corresponding to the resonance risk frequency; performs FFT on the subsequent vibration signal to identify the peak-to-peak amplitude and the frequency corresponding to the sub-peak value, if the frequency is not in the Within the range of risk frequency ±10%, update the resonance risk frequency table; analyze the peak-to-peak amplitude and sub-peak amplitude of subsequent vibration signals based on the resonance risk frequency table, and when the vibration amplitude exceeds the vibration threshold, perform adaptive jump speed control; evaluate vibration in real time The size of the fatigue damage D, when D is less than the design value, increase the vibration monitoring threshold, when D is greater than the design value, reduce the vibration monitoring threshold; The deficiencies in the application of towers and soft towers can also be used to solve the problems caused by abnormal resonance of towers, release the limitation of tower acceleration, increase power generation by about 1% without adding additional sensors.

Description

technical field [0001] The invention belongs to the technical field of wind turbine health state monitoring and evaluation, and in particular relates to an adaptive resonance speed control method based on life evaluation. Background technique [0002] With the continuous large-scale development of wind power resources, the existing areas with better wind resources have been basically or nearly completed. In a large number of areas with poor wind resources, increasing the height of the hub center can effectively reduce the impact of wind shear and increase power generation, so high tower technology has become an important development direction at present. Steel flexible tower is one of the important development directions. It has the advantages of simple structure, simple production process, convenient transportation and maintenance, but because of its low overall stiffness of the tower, it is prone to the first-order and second-order towers and the 1P and 2P of the whole mac...

AI Technical Summary

Problems solved by technology

But on taller soft towers and soft towers, there are some defects in the method of actively jumping the speed: for high soft towers, the frequency and orientation of tower resonance are expanded, and the second order of the tower and the speed of 3P, 4P, 5P may , 6P, etc. resonate; because the resonance azimuth expands, frequent jumps in speed will cause loss of power generation; the existence of multiple resonance zones will make the setting of control strategies more complicated; in conventional system identification, it is not easy to identify Higher-order vibration characteristics of the tower; for soft towers, in the operating condition of the whole machine, in addition to the rotation frequency, other machine operating frequencies may also excite tower resonance

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