Inverter-embedded DFIG Rotor Winding Insulation Testing for Wind Energy Applications

Failure in the rotor winding insulation of doublyfed induction generators (DFIG) is common due to the harsh environment and operating stresses. However, testing rotor insulation is difficult and costly due to the limited accessibility of wind generators as they are installed at remote locations insi...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2024-08, p.1-9
Main Authors: Park, Cheol-Hui, Zapico, Marcos Orviz, Bolanos, Adrian Salcedo, Reigosa, David Diaz, Byun, Namhyuk, Brizdel Blanco, Fernando, Osama, Mohamed, Lee, Sang Bin
Format: Article
Language:English
Subjects:
Capacitance (C)
Dissipation Factor (DF)
Doubly -fed Induction Generator (DFIG)
Doubly fed induction generators
Fault Diagnosis
Insulation
Insulation Testing
Inverter
Off-line Testing
Partial Discharge (PD)
Rotors
Stress
Testing
Voltage measurement
Windings
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Summary:Failure in the rotor winding insulation of doublyfed induction generators (DFIG) is common due to the harsh environment and operating stresses. However, testing rotor insulation is difficult and costly due to the limited accessibility of wind generators as they are installed at remote locations inside the nacelle. Therefore, remote and automated insulation testing can help improve the reliability and reduce maintenance cost of wind generators. In this paper, a new approach for testing the integrity of rotor winding insulation for DFIGs is proposed. The main idea is to use the rotor-side inverter to perform off-line insulation testing whenever the wind generator is stopped. New test methods for off-line 1) partial discharge (PD) detection based on impulse voltage excitation and 2) capacitance (C) and dissipation factor (DF) testing based on common mode voltage excitation are proposed. Testing on a 6.3 kW wound rotor induction machine is given to verify the effectiveness of the proposed rotor insulation test method
ISSN:0093-9994
DOI:10.1109/TIA.2024.3443788