Tower drum fatigue load accumulation method and system based on wind direction frequency distribution

A technology of fatigue load and wind direction frequency, which is applied in the monitoring of wind turbines, the configuration of installing/supporting wind turbines, wind turbines, etc., can solve unconsidered problems, reduce fatigue damage, reduce equivalent fatigue loads, and lower towers Effect of Barrel Weight

CN114810505APending Publication Date: 2022-07-29CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-07-29

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Abstract

The invention discloses a tower drum fatigue load accumulation method and system based on wind direction frequency distribution. The method comprises the steps that S1, wind frequency distribution of each sector of a specific site machine location point, Weibull distribution parameters of each sector and effective turbulence intensity of each sector are obtained; s2, through load calculation, obtaining an equivalent fatigue load corresponding to a cabin azimuth angle and a tower drum circumferential weld hot spot; s3, sorting the wind frequency distribution of each sector; sequencing equivalent fatigue loads corresponding to the tower drum circumferential weld hot spots; performing equivalent transformation on the equivalent fatigue loads of all the sectors according to the fatigue curve index m of the material and the sequenced parameters to obtain an equivalent tower drum circumference maximum value; s4, according to the equivalent fatigue load-stress relation, the equivalent maximum fatigue damage of the tower drum circumference life cycle is obtained through calculation. The method has the advantages of effectively reducing the equivalent fatigue load of the weld joint of the tower drum, reducing the weight of the tower drum, saving the steel consumption, reducing the wind investment cost and the like.
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Description

technical field

[0001] The invention mainly relates to the technical field of wind power, and in particular relates to a tower fatigue load accumulation method and system based on wind direction frequency distribution. Background technique

[0002] The wind turbine tower is subjected to alternating fatigue loads with a lifetime of 20 years. The fatigue loads mainly come from turbulence. Due to the influence of surface roughness and wake, the turbulence intensity varies with the wind direction. The traditional tower fatigue load calculation does not consider the influence of the wind direction on the tower fatigue load. It is assumed that the wind direction is always in one direction for the load calculation and simulation, and at a specific wind farm site, the operation of the wind turbine is yawed according to the main wind direction, and the wind turbine is always in Therefore, it is conservative to use the load in one direction to carry out the fatigue accumulation of the...

Examples

Embodiment Construction

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] like figure 2 As shown, the tower fatigue load accumulation method based on the wind direction frequency distribution of this embodiment includes the steps:

[0032] S1. Obtain the wind frequency distribution P(θ) of each sector of the specific site site, the Weibull distribution parameters (A, k) of each sector, and the effective turbulence intensity Ieff of each sector;

[0033] S2. Through the load calculation, the azimuth angle θ of the engine room and the hot spot P of the circumferential weld of the tower are obtained. j Corresponding equivalent fatigue load M pj (θ);

[0034] S3. Sort the wind frequency distribution P(θ) of each sector; the hot spot P of the circumferential weld of the tower j Corresponding equivalent fatigue load M pj (θ) Sorting; according to the fatigue curve index m of the material and the corresponding M ...