Method for calculating frequency sensitivity of wind turbine tower bending moment fatigue load on system

By calculating the sensitivity of the tower bending moment fatigue load of the doubly fed wind turbine to the system frequency, the problem of power system frequency instability was solved, the service life of the wind turbine was extended, and the stability and economic benefits of the power system were improved.

CN117591782BActive Publication Date: 2026-07-24HARBIN INST OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN INST OF TECH
Filing Date
2023-10-30
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively calculate the sensitivity of the tower bending moment fatigue load of doubly fed wind turbines to the system frequency, leading to power system frequency instability and shortened service life of wind turbines.

Method used

By establishing state-space equations based on wind turbine speed and blade pitch angle, the relationship between tower bending moment fluctuations in the forward and backward directions and power system frequency deviation is calculated. Frequency modulation methods are used to adjust the active power reference value, and the sensitivity of tower fatigue load to system frequency is solved.

Benefits of technology

It has improved the stability of the power system and the service life of wind turbines, reduced maintenance costs, enhanced the reliability of the power grid and the competitiveness of the wind energy industry, and promoted the sustainable development of green energy.

✦ Generated by Eureka AI based on patent content.

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    Figure CN117591782B_ABST
Patent Text Reader

Abstract

The application discloses a kind of wind turbine tower bending moment fatigue load to the calculation method of system frequency sensitivity, belong to wind turbine technical field, specific scheme includes the following steps: step one, first determine the relationship between the frequency deviation of the power reference value of wind turbine participating in primary frequency modulation and the unit value;Step two, establish the state space equation of wind turbine based on wind wheel speed and pitch angle;Step three, establish the relationship between tower front and rear direction bending moment fluctuation ΔM t (t+1) and the active power reference value ΔP W_ref that double-fed wind turbine participating in frequency modulation needs to adjust;Step four, the sensitivity of tower front and rear direction bending moment fluctuation to system frequency is solved
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