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Fault Ride Through Techniques of DFIG-based Wind Energy Systems

Fault Ride Through Techniques of DFIG-based Wind Energy Systems. Presenter: Lingling Fan, Co-authors: Chanxia Zhu, Minqiang Hu (Southeast University , Nanjing China) Assistant Professor Electrical Engineering University of South Florida Tampa, FL 33620 USA. Outline. Objectives

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Fault Ride Through Techniques of DFIG-based Wind Energy Systems

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  1. Fault Ride Through Techniques of DFIG-based Wind Energy Systems Presenter: Lingling Fan, Co-authors: Chanxia Zhu, MinqiangHu (Southeast University, Nanjing China) Assistant Professor Electrical Engineering University of South Florida Tampa, FL 33620 USA

  2. Outline • Objectives • Analysis of DFIG behavior during faults • Single phase fault ride through • Three-phase fault ride through • Simulation results • Conclusion

  3. Objective • Design control schemes to help DFIG ride through faults • Faults: Balanced (symmetrical) or unbalanced (unsymmetrical) • In literature, ride through balanced faults and unbalanced faults are treated separately • A control scheme for all

  4. fm Doubly Fed Induction Generator Ps RSC AC/DC GSC DC/AC Pr = sPs

  5. DFIG converter control loops GSC DC/AC RSC DC/AC

  6. Analysis of DFIG behavior during unbalanced faults Unbalanced stator currents Positive sequence (fe) Negative sequence (-fe) Zero sequence Rotor currents Ir: fe-fm=sfe Ir: -fe-fm=-(2-s)fe s: slip = 1-fm/fe fm: electric frequency corresponding to rotating speed. fe: nominal frequency 60 Hz (stator) – 50 Hz (rotating speed) = 10 Hz -60 Hz (stator) – 50 Hz (rotating speed) = -110 Hz

  7. Analysis of DFIG behavior during balanced faults

  8. Reference frames Pos. Neg. Sequences and DC can be separated by a dc filter!

  9. Extraction scheme

  10. Fault ride through schemes- modify RSC current control loops

  11. An alternative- PR controller

  12. Simulation Results – unbalanced fault

  13. Simulation Results – unbalanced fault

  14. Simulation Results – unbalanced fault

  15. Simulation results – balanced fault

  16. Simulation results – balanced fault

  17. Conclusion • Proportional Resonant control is proposed for RSC to mitigate rotor current high frequency components and surge. • Simulation results demonstrate the effectiveness. • A major contribution: both unbalanced and balanced faults are considered.

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