Skip to main content
Article thumbnail
Location of Repository

Analysis of shaft voltage in a doubly-fed induction generator

By Jafar Adabi Firouzjaee, Firuz Zare, Arindam Ghosh and Robert D. Lorenz


Fast switching transients and common mode voltage generated by pulse width modulated voltage in high frequency applications may cause many unwanted problems such as shaft voltage and resultant bearing currents. The main objective of this research work is to analyse shaft voltage generation in a doubly-fed induction generator (DFIG) with a back to back converter. A detailed high frequency model of the proposed system has been developed based on capacitive couplings between different objects of the machine. The proposed model can be used for shaft voltage calculations and finding parameters which have key effect on shaft voltage and resultant bearing currents. A discussion about the presented technique for shaft voltage elimination in existing literature is also presented based on mathematical analysis and simulations

Topics: DFIG, Wind turbine, Shaft voltage, PWM, Common mode voltage
Publisher: European Association for the Development of Renewable Energies and Power Quality
Year: 2007
OAI identifier:

Suggested articles


  1. (2001). Common mode current attenuation techniques for use with PWM drives," Power Electronics,
  2. (1996). Effect of PWM inverters on AC motor bearing currents and shaft voltages," Industry Applications,
  3. (2007). Firuz Zare, Gerard Ledwich, Arindam Ghosh, “Leakage Current and Common Mode Voltage Issues
  4. (2003). Minimization and cancellation of common-mode currents, shaft voltages and bearing currents for induction motor drives," presented at Power Electronics Specialist Conference,
  5. (2006). Modelling of Electric Motors for Electromagnetic Compatibility Analysis”, presented at AUPEC
  6. (2002). R.W.De Doncker, Doubly fed induction generator systems for wind turbines,
  7. Reduction of Bearing Currents
  8. (1996). Source of induction motor bearing currents caused by PWM inverters" Energy Conversion,
  9. (2005). Wilfried Hofmann, Andreas Wiese, “Bearing Currents in Doubly-Fed Induction Generators”, Power Electronics and Applications,

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.