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Robust Multivariable Control of Electro-mechanical System in Horizontal Wind Turbines under Off-design Conditions

Faraji Nayeh, Reza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47970 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Vosughi Vahdat, Bijan; Moradi, Hamed
  7. Abstract:
  8. Advanced control techniques are required to achieve a cost-effective and reliable use of the wind power generation. The wind turbines are generally controlled based on two control objectives: the turbine protection and the generation of acceptable power for the utility grid. These objectives are achieved if the control inputs are applied based on appropriate control logics. In this work, a nonlinear multivariable model of the wind turbine with a DFIG generator is considered. The rotor speed and the d-axis rotor current (as the control outputs) are controlled via manipulation of the two generator voltages (as the control inputs) in low wind velocity condition. For high wind velocity, the control inputs increase to three: the blade pitch angle and generator voltages. Two robust control strategies including the sliding mode controller and robust controller (designed via μ-synthesis based on DK-iteration algorithm) are presented for switching between various operating modes. The performance of these control strategies are evaluated and compared. During the wind turbine operation, obtaining a maximum active power and suppressing the reactive power are the control objectives. Results are presented for various profiles of the wind velocity. It is observed that the sliding mode controller has a better performance in the transient time response. Moreover, in comparison with , sliding mode approach leads to the less tracking error and settling time (but minor acceptable chattering exists)
  9. Keywords:
  10. Wind Turbine ; Uncertainty ; Renewable Energy Resources ; Doubly Fed Induction Generator (DFIG) ; Sliding Mode Control ; Off-Design Condition

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