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Electrical & Mechanical Diagnostic Indicators of Wind Turbine Induction Generator Rotor Faults

Zappalá, D.; Sarma, N.; Djurović, S.; Crabtree, C.J.; Mohammad, A.; Tavner, P.J.

Electrical & Mechanical Diagnostic Indicators of Wind Turbine Induction Generator Rotor Faults Thumbnail


Authors

D. Zappalá

N. Sarma

S. Djurović

A. Mohammad

P.J. Tavner



Abstract

In MW-sized wind turbines, the most widely-used generator is the wound rotor induction machine, with a partially-rated voltage source converter connected to the rotor. This generator is a significant cause of wind turbine fault modes. In this paper, a harmonic time-stepped generator model is applied to derive wound rotor induction generator electrical & mechanical signals for fault measurement, and propose simple closed-form analytical expressions to describe them. Predictions are then validated with tests on a 30 kW induction generator test rig. Results show that generator rotor unbalance produces substantial increases in the side-bands of supply frequency and slotting harmonic frequencies in the spectra of current, power, speed, mechanical torque and vibration measurements. It is believed that this is the first occasion in which such comprehensive approach has been presented for this type of machine, with healthy & faulty conditions at varying loads and rotor faults. Clear recommendations of the relative merits of various electrical & mechanical signals for detecting rotor faults are given, and reliable fault indicators are identified for incorporation into wind turbine condition monitoring systems. Finally, the paper proposes that fault detectability and reliability could be improved by data fusion of some of these electrical & mechanical signals.

Citation

Zappalá, D., Sarma, N., Djurović, S., Crabtree, C., Mohammad, A., & Tavner, P. (2019). Electrical & Mechanical Diagnostic Indicators of Wind Turbine Induction Generator Rotor Faults. Renewable Energy, 131, 14-24. https://doi.org/10.1016/j.renene.2018.06.098

Journal Article Type Article
Acceptance Date Jun 24, 2018
Online Publication Date Jun 28, 2018
Publication Date Feb 1, 2019
Deposit Date Mar 23, 2018
Publicly Available Date Jun 29, 2018
Journal Renewable Energy
Print ISSN 0960-1481
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 131
Pages 14-24
DOI https://doi.org/10.1016/j.renene.2018.06.098

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