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Diagnosis of Rotor and Stator Asymmetries in Wound-Rotor Induction Machines Under Nonstationary Operation Through the Instantaneous Frequency

Vedreno-Santos, Francisco; Riera-Guasp, Martin; Henao, Humberto; Pineda-Sanchez, Manuel; Puche-Panadero, Ruben


Martin Riera-Guasp

Humberto Henao

Manuel Pineda-Sanchez

Ruben Puche-Panadero


This paper proposes a methodology to improve the reliability of diagnosis of different types of faults in wound-rotor induction generators which work under variable load conditions, as in wind turbine applications; the method is based on the extraction of the instantaneous frequency (IF) of the fault-related components of stator and rotor currents during speed changes caused by nonstationary functioning. It is shown that, under these conditions, the IF versus slip plots of the fault components are straight lines with a specific slope and y-intercept for each kind of fault. In addition, neither of these patterns are dependent on the machine features or the way that the load changes. The practical methodology of this technique is introduced for diagnosing two different anomalies: stator winding asymmetry and rotor winding asymmetry. The approach is validated by laboratory tests for both types of faults in two different kinds of machines.

Journal Article Type Article
Acceptance Date Aug 4, 2013
Publication Date 2014-09
Deposit Date Oct 5, 2016
Journal IEEE Transactions on Industrial Electronics
Print ISSN 0278-0046
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 61
Issue 9
Pages 4947-4959
Keywords wind generation, Analytic signal (AS), discrete wavelet transform (DWT), fault diagnosis, Hilbert transform (HT), induction generator, instantaneous frequency (IF), load fluctuating conditions, time–frequency analysis
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