Aalborg Universitet Modeling and Stress Analysis of Doubly-Fed Induction Generator during Grid Voltage

The Doubly-Fed Induction Generator (DFIG) based wind turbine system is presently dominant in the wind turbine market. Due to heavy load switch-off and faults in the power grid, voltage swells may occur and this phenomenon is currently given sufficient insights. This paper starts to describe the DFIG modeling and challenges when facing the symmetrical voltage swell. Then, the High Voltage Ride-Through (HVRT) capability of the DFIG can be calculated by using the demagnetizing current control, and the stator current, rotor current as well as the electromagnetic toque can be deduced during the transient voltage swell and its recovery. It is concluded that although both higher swell level and higher rotor speed cause higher rotor electromotive force, the doubly-fed induction generator can successfully ride through the grid fault due to the relatively small swell level required by the modern grid codes. Additionally, the calculated maximum stresses of the DFIG can be verified by simulation results in terms of the rotor current, stator current, and the toque at various swell levels.

[1]  Dehong Xu,et al.  Control of Doubly-Fed Induction Generator to Ride-Through Recurring Grid Faults , 2016, IEEE Transactions on Power Electronics.

[2]  Frede Blaabjerg,et al.  Optimized Reactive Power Flow of DFIG Power Converters for Better Reliability Performance Considering Grid Codes , 2015, IEEE Transactions on Industrial Electronics.

[3]  Fangxing Li,et al.  Maximum power point tracking strategy for large-scale wind generation systems considering wind turbine dynamics , 2015, 2015 IEEE Power & Energy Society General Meeting.

[4]  Frede Blaabjerg,et al.  Future on Power Electronics for Wind Turbine Systems , 2013, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[5]  David J. Atkinson,et al.  Evaluation of the Performance of a DC-Link Brake Chopper as a DFIG Low-Voltage Fault-Ride-Through Device , 2013, IEEE Transactions on Energy Conversion.

[6]  Kavitha Busi,et al.  Fault Ride-Through of a DFIG Wind Turbine Using a Dynamic Voltage Restorer during Symmetrical and Asymmetrical Grid Faults , 2013 .

[7]  Dehong Xu,et al.  Flexible control of DC-link voltage for doubly fed induction generator during grid voltage swell , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[8]  Luis Marroyo,et al.  Ride Through of Wind Turbines With Doubly Fed Induction Generator Under Symmetrical Voltage Dips , 2009, IEEE Transactions on Industrial Electronics.

[9]  J. Morren,et al.  Ridethrough of wind turbines with doubly-fed induction generator during a voltage dip , 2005, IEEE Transactions on Energy Conversion.