EARLY DETECTION OF INTER-TURN AND DEMAGNETIZATION FAULTS OF PERMANENT MAGNET SYNCHRONOUS WIND GENERATOR

Liu Yingming; Zhang Tianqi; Wang Xiaodong; Gao Xing; Xie Hongfang

doi:10.19912/j.0254-0096.tynxb.2021-0307

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (10) : 252-258. DOI: 10.19912/j.0254-0096.tynxb.2021-0307

EARLY DETECTION OF INTER-TURN AND DEMAGNETIZATION FAULTS OF PERMANENT MAGNET SYNCHRONOUS WIND GENERATOR

Liu Yingming¹, Zhang Tianqi¹, Wang Xiaodong¹, Gao Xing¹, Xie Hongfang²

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Abstract

Permanent magnet synchronous generator has unique advantages in power generation efficiency, reliability, grid friendliness and other aspects, and has gradually become the mainstream choice of wind turbines with capacity of 5 MW and above. In this paper, the characteristics and monitoring methods of demagnetization and short circuit between winding turns of permanent magnet synchronous motor are studied, and the mathematical models of these two faults are established. A method based on zero-sequence voltage component and fault indication is proposed to detect early minor fault and judge fault phase of inter-turn short-circuit. An on-line demagnetization fault monitoring method based on sliding mode observer is proposed. The method not only can precisely identify the permanent magnet flux, but also possesses the advantages of higher identification precision and faster speed. The simulation results verify the availability and advantages of the two fault diagnosis methods.

Key words

permanent magnet synchronous motor / fault diagnosis / inter-turn short-circuit / demagnetization / zero sequence voltage

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Liu Yingming, Zhang Tianqi, Wang Xiaodong, Gao Xing, Xie Hongfang. EARLY DETECTION OF INTER-TURN AND DEMAGNETIZATION FAULTS OF PERMANENT MAGNET SYNCHRONOUS WIND GENERATOR[J]. Acta Energiae Solaris Sinica. 2022, 43(10): 252-258 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0307

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