Fault Ride Through Techniques of DFIG-based Wind Energy Systems
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Fault Ride Through Techniques of DFIG-based Wind Energy Systems
Presenter: Lingling Fan, Co-authors: Chanxia Zhu, Minqiang Hu (Southeast University, Nanjing China)
Assistant ProfessorElectrical Engineering
University of South FloridaTampa, FL 33620
USA
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Outline
• Objectives• Analysis of DFIG behavior during faults• Single phase fault ride through• Three-phase fault ride through• Simulation results• Conclusion
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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
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Doubly Fed Induction Generator
fm
RSCAC/DC
Pr = sPs
Ps
GSCDC/AC
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DFIG converter control loops
GSCDC/AC
RSCDC/AC
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Analysis of DFIG behavior during unbalanced faults
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Unbalanced stator currents
Positive sequence(fe)
Negative sequence(-fe)
Zero sequence
Ir: fe-fm=sfe
Rotor currents
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
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Analysis of DFIG behavior during balanced faults
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Reference frames
Pos. Neg. Sequences and DC can be separated by a dc filter!
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Extraction scheme
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Fault ride through schemes- modify RSC current control loops
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An alternative- PR controller
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Simulation Results – unbalanced fault
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Simulation Results – unbalanced fault
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Simulation Results – unbalanced fault
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Simulation results – balanced fault
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Simulation results – balanced fault
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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.