1. ACTIVE CONTROL OF WIND TURBINE ROTOR TORSIONAL VIBRATION
Warren N. White
Zhichao Yu
Mechanical and Nuclear Engineering
Kansas State University
Manhattan, KS 66506
Ruth Douglas Miller
David Ochs
Electrical and Computer Engineering
Kansas State University
Manhattan, KS 66506

2. Agenda Introduction Torsion Measurement Scheme
Generator Model and Controller
The Vibration Isolator
Results
Conclusions
* Especially appreciate ePEP’s
generosity for supporting the
research
Kansas State University DSCC

3. Introduction Reduction of rotor shaft torsional vibrations
Active control of generator torque
Measurement of the rotor shaft torsion
NREL FAST simulation with PMSG for different conditions
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4. Torsion Measurement Scheme
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5. Generator Model and Controller
Generator torque:
(1)
Direct and Quadrature voltage:
PMSG
Generator
(2)
Linearization and decoupling:
(3)
(6)
Feedback linearization, let:
(7)
(4)
(5)
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6. Generator Model and Controller Cont.
(6)
PMSG
Generator
(7)
(8)
Define the error signal:
(8)
(11)
(9)
(10)
Define the transfer function between E(s) and :
CLTF:
(12)
(10)
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7. Generator Simulink Model
PMSG
Generator
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8. Generator Torque Controller
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9. The vibration Isolator
Drive Train Two Mass Model
Vibration Isolator Derivation
Speed, Torque, and Vibration Control
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10. Drive Train Two Mass Model
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11. Vibration Isolator Derivation
Generator torque:
(13)
High pass filter
Low pass filter
Speed Control
BPF
10HZ
1000HZ
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12. Speed, Torque, and Vibration Control
Rotor Speed
Desired
Rotor Speed
Rotor Torque
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13. Results NREL 5 MW Turbine Blade Pitches = 12.5 ̊
Rotor Speed Control, ωd = 11 RPM
Steady, Time-varying, Turbulent wind, vmean= 15 m/s
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14. STEADY WIND
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15. Time Varying Wind
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16. Turbulent Wind
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17. GENERATOR TORQUE FOR TWO DIFFERENT ISOLATOR GAINS
ROBUSTNESS TEST FOR ISOLATOR
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18. GENERATOR POWER FOR TWO ISOLATOR GAINS
ROBUSTNESS TEST FOR ISOLATOR – IN-PLANE BLADE BASE BENDING MOMENT SUM USED FOR FEEDBACK
GENERATOR POWER FOR TWO ISOLATOR GAINS
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19. Conclusions Rotor vibrations were eliminated or substantially reduced
Application of rotor torque measurement scheme
Including generator electrical system in analysis
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20. Future Work Band pass filter Including gearbox model in the analysis
Including doubly fed induction generator(DFIG)
Assessing life extension by reduction of torsion
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21. I Appreciate Your Attention
The End
Questions?
Warren N. White
Zhichao Yu
Ruth Douglas Miller
David Ochs
Kansas State University DSCC