A method and system for identifying the single-blade runaway fault of a wind turbine

The method improves single blade runaway fault detection in wind turbines by using pitch error and deviation calculations, addressing inefficiencies in existing recognition methods and reducing detection time.

CN115788794BActive Publication Date: 2025-07-15GUANGDONG MINGYANG WIND POWER IND GRP CO LTD
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Patent Information

Application Number
CN202211499346.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-28
Publication Date
2025-07-15
Estimated Expiration
2042-11-28

AI Technical Summary

Technical Problem

The prior art cannot quickly and accurately identify the single blade run-off fault of the wind turbine unit, resulting in a large threshold setting of the shutdown error, affecting the normal power generation conditions.

Method used

By introducing the pitch desired follow error and the pairwise expected follow deviation, the blade pitch instruction and angle difference is calculated using the pitch second-order transfer function, the pitch expectation follow error and the pairwise expected follow deviation are constructed, the threshold is set to identify the run-off fault, and the shutdown logic is triggered.

Benefits of technology

It improves the accuracy of fault recognition, reduces the time of fault recognition, avoids accidental triggering of shutdown, and achieves fast and accurate single-blade run-off fault recognition.

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Abstract

The present invention discloses a method and system for identifying the single-blade runaway fault of a wind turbine generator set, including: 1) calculating the pitch desired following error of each blade based on the pitch commands of each blade output by the pitch controller and the current pitch angles of each blade measured by sensors; 2) calculating the deviation between the pitch desired following errors of any two blades based on the pitch desired following error, which is called the pairwise desired following deviation; 3) judging whether the runaway faults occur in Blade 1, Blade 2, and Blade 3 based on the pairwise desired following deviation, and obtaining the runaway fault flag bits of each blade; 4) obtaining the runaway fault shutdown flag bit based on the runaway fault flag bits of each blade, and triggering the wind turbine generator set to enter the runaway fault shutdown logic until the unit is completely shut down. By introducing the pitch desired following error and the pairwise desired following deviation, the present invention proposes an effective method for identifying the single-blade runaway fault for the runaway fault, which can improve the fault identification accuracy and reduce the fault identification time.
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