ANALYSIS OF STATOR VIBRATION CHARACTERISTICS OF DOUBLY-FED WIND TURBINE UNDER AIR GAP STATIC ECCENTRICITY FAULT CONSIDERING SPEED FLUCTUATION

Wang Xuan; Wan Shuting; Zhang Bolin; Zhang Xiong; Sheng Xiaoling

doi:10.19912/j.0254-0096.tynxb.2024-0028

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (5) : 448-457. DOI: 10.19912/j.0254-0096.tynxb.2024-0028

ANALYSIS OF STATOR VIBRATION CHARACTERISTICS OF DOUBLY-FED WIND TURBINE UNDER AIR GAP STATIC ECCENTRICITY FAULT CONSIDERING SPEED FLUCTUATION

Wang Xuan, Wan Shuting, Zhang Bolin, Zhang Xiong, Sheng Xiaoling

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Abstract

This paper proposes and investigates the characteristic analysis of air gap static eccentricity faults considering speed fluctuations. First, a theoretical analysis of the fault characteristics is conducted. Using the magnetic flux density-electromagnetic force density method, analytical expressions for the circumferential air gap magnetic density, time-varying magnetic flux density, and electromagnetic force density are derived before and after considering speed fluctuation, with their variation characteristics analyzed. Then, a doubly-fed wind turbine generator model incorporating air gap static eccentricity and generator control modules, along with a speed fluctuation model, is established using Matlab/Simulink-Simplorer-Maxwell 2D. Finally, experimental validation is performed on a test platform capable of simulating speed fluctuation and air gap static eccentricity in doubly-fed wind turbine generators. Vibration signals from the stator core are acquired before and after considering speed fluctuations, and time-frequency characteristics are extracted using synchrosqueezing transform based on short-time Fourier transform. The results demonstrate that when speed fluctuation is considered, air gap static eccentricity induces 3k (k=1,2,3,... ) multiples of the mechanical rotational frequency in the magnetic flux density. Additionally, electromagnetic force density and vibration signals exhibit frequency components at 2f±3kf_w (where f_w denotes the impeller rotational frequency). Through synchrosqueezing transform, frequency components 2f±3kf_wt can be effectively extracted, where 2f±3kf_wt is induced by speed fluctuation.

Key words

wind turbines / wind speed / fault diagnosis / air gap static eccentricity / vibration characteristics / synchrosqueezing transform

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Wang Xuan, Wan Shuting, Zhang Bolin, Zhang Xiong, Sheng Xiaoling. ANALYSIS OF STATOR VIBRATION CHARACTERISTICS OF DOUBLY-FED WIND TURBINE UNDER AIR GAP STATIC ECCENTRICITY FAULT CONSIDERING SPEED FLUCTUATION[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 448-457 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0028

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