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Keywords = radial dynamic air-gap eccentricity (RDAGE)

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12 pages, 3742 KiB  
Article
Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG
by Ming-Xing Xu, Yu-Ling He, Wen Zhang, De-Rui Dai, Xiang-Ao Liu, Wen-Jie Zheng, Shu-Ting Wan, David Gerada and Shan-Zhe Shi
Energies 2022, 15(17), 6426; https://doi.org/10.3390/en15176426 - 2 Sep 2022
Cited by 5 | Viewed by 2091
Abstract
In this paper, qualitative theoretical derivations, finite element analysis (FEA) and experiments are used to investigate the electromagnetic force (EF) and vibration characteristics of end windings. In contrast to previous studies, this study focuses not only on end winding EF/vibration under normal and [...] Read more.
In this paper, qualitative theoretical derivations, finite element analysis (FEA) and experiments are used to investigate the electromagnetic force (EF) and vibration characteristics of end windings. In contrast to previous studies, this study focuses not only on end winding EF/vibration under normal and radial static air gap eccentricity (RSAGE) conditions, but also for the cases of radial dynamic air gap eccentricity (RDAGE) and radial dynamic static hybrid air gap eccentricity (RHAGE). Firstly, the magnetic flux density (MFD) is derived for normal and radial air gap eccentricity (RAGE) faults, and detailed EF expressions are obtained before and after the RAGE fault. The finite element analysis (FEA) and experimental studies were performed on a four-pole DFIG at a speed of 1500 rpm to verify the proposed theoretical analysis. It is shown that RSAGE only enlarges the EF/end winding vibration and does not introduce new frequency components. RDAGE not only increases EF/end winding vibration but also introduces new frequency components. RHAGE can be seen as a superimposed effect of RSAGE and RDAGE. Full article
(This article belongs to the Section F3: Power Electronics)
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15 pages, 11449 KiB  
Article
Analysis of the Characteristics of Stator Circulating Current Inside Parallel Branches in DFIGs Considering Static and Dynamic Air-Gap Eccentricity
by Yu-Ling He, Xiang-Ao Liu, Ming-Xing Xu, Wen Zhang, Wen-Jie Zheng, De-Rui Dai, Gui-Ji Tang, Shu-Ting Wan and David Gerada
Energies 2022, 15(17), 6152; https://doi.org/10.3390/en15176152 - 24 Aug 2022
Cited by 3 | Viewed by 2225
Abstract
In this article, the stator winding circulating current inside parallel branches (CCPB) of a doubly fed induction generator (DFIG) is comprehensively investigated. Different from other studies, this study not only focuses on the CCPB in radial static air-gap eccentricity (RSAGE) and radial dynamic [...] Read more.
In this article, the stator winding circulating current inside parallel branches (CCPB) of a doubly fed induction generator (DFIG) is comprehensively investigated. Different from other studies, this study not only focuses on the CCPB in radial static air-gap eccentricity (RSAGE) and radial dynamic air-gap eccentricity (RDAGE) but also takes the radial hybrid air-gap eccentricity (RHAGE) cases into account. Firstly, the detailed expressions of CCPB in normal and radial air-gap eccentricity (RAGE) are obtained. Then, the finite element analysis (FEA) and experimental studies are performed on a four-pole DFIG with a rated speed of 1470 rpm in order to verify the theoretical analysis. It is shown that the RAGE increases the amplitude of the CCPB and brings new frequency components to the CCPB. For RSAGE, the CCPB brings new frequency components, which are f1 (50) and fμ (540/640). For RDAGE, the newly generated frequency components are f1± fr (25/75), fu ± fr (515/565/615/665, and k = ±1). For RHAGE, the newly added frequency components in RSAGE and RDAGE are present at the same time. In addition, the more the RAGE degree is, the larger the amplitude of characteristic frequency components will be. The results obtained in this paper can be used as a supplementary criterion for diagnosing DFIG eccentric faults. Full article
(This article belongs to the Special Issue Condition Monitoring and Failure Prevention of Electric Machines)
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