Stator Inter-Turn Fault Detection of Doubly-Fed Induction Generators Using Rotor Current and Search Coil Voltage Signature Analysis

A novel technique for detecting stator inter-turn faults in a doubly fed induction generator (DFIG) is proposed by analyzing its rotor current and search coil voltage. So far, fault diagnostic techniques proposed for stator inter-turn fault detection in DFIG are based on analysis of stator current or vibration of generator. Results from these methods are ambiguous because either they fail to account for condition when DFIG is operating under unbalanced load or these methods are based on experimental results alone. Our recent observations suggested that harmonics induced in the rotor circuit are very promising in detecting stator inter-turn faults in DFIGs. Hence, in this study, an in-depth investigation was conducted to determine the origin of various harmonic components in the rotor currents and their feasibility to detect inter-turn stator faults unambiguously. Detailed analysis is presented that explains the induction of stator inter-turn fault related harmonics in the rotor circuit. The theory is verified with simulation and extensive experimental results.

[1]  Theodore Wildi,et al.  Electrical Machines, Drives, and Power Systems , 1990 .

[2]  Birgitte Bak-Jensen,et al.  Conceptual survey of Generators and Power Electronics for Wind Turbines , 2001 .

[3]  S. Nandi,et al.  Stator Inter-turn Fault Detection of Synchronous Machines Using Field Current Signature Analysis , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[4]  Hamid A. Toliyat,et al.  Condition monitoring and fault diagnosis of electrical machines-a review , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[5]  A.M. Knight,et al.  A review of power converter topologies for wind generators , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[6]  G. B. Kliman,et al.  Noninvasive detection of broken rotor bars in operating induction motors , 1988 .

[7]  Hamid A. Toliyat,et al.  Novel frequency-domain-based technique to detect stator interturn faults in induction machines using stator-induced voltages after switch-off , 2002 .

[8]  Peter Vas,et al.  Parameter Estimation, Condition Monitoring, and Diagnosis of Electrical Machines , 1993 .

[9]  Ion Boldea,et al.  Condition monitoring of wind generators , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[10]  L. Bertling,et al.  Maintenance Management of Wind Power Systems Using Condition Monitoring Systems—Life Cycle Cost Analysis for Two Case Studies , 2007, IEEE Transactions on Energy Conversion.

[11]  Hamid A. Toliyat,et al.  Transient analysis of cage induction machines under stator, rotor bar and end ring faults , 1995 .

[12]  J.R. Saenz,et al.  On-line stator winding fault diagnosis in induction generators for renewable generation , 2004, Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521).

[13]  H. Douglas,et al.  The detection of interturn stator faults in doubly-fed induction generators , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[14]  W. T. Thomson,et al.  On-line MCSA to diagnose shorted turns in low voltage stator windings of 3-phase induction motors prior to failure , 2001, IEMDC 2001. IEEE International Electric Machines and Drives Conference (Cat. No.01EX485).

[15]  Subhasis Nandi,et al.  Space and time harmonics related problems and their mitigation for position and speed sensorless slip-ring induction motor drives applications , 2008 .

[16]  Qing Wu.  Single-turn sensitive stator inter-turn fault detection of induction machines , 2008 .

[17]  D. Casadei,et al.  Diagnostic Technique based on Rotor Modulating Signals Signature Analysis for Doubly Fed Induction Machines in Wind Generator Systems , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[18]  E. Ritchie,et al.  Model of stator inter-turn short circuit fault in doubly-fed induction generators for wind turbine , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[19]  Hamid A. Toliyat,et al.  Fault diagnosis of electrical machines-a review , 1999, IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272).

[20]  J. Penman,et al.  Detection and location of interturn short circuits in the stator windings of operating motors , 1994 .