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Active Control of Edgewise Vibrations in Wind Turbine Blade by Optimization of the Number and Locations of the Intermediate Actuators

Pishbahar, Baher | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53816 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moradi, Hamed
  7. Abstract:
  8. Vibrations in HAWT reduce their efficiency and increase maintenance costs. In this paper, the blade edgewise vibrations are reduced by using several actuators in different parts of the wind turbine blade and optimization of the number and locations of actuators. The wind turbine blade dynamic behavior is investigated by using dynamic modeling. The actuators are trusses that are located inside each blade and apply control force to different parts of the blade. Active control force is applied to reduce edgewise vibrations. The designed controller is applied and simulated on NREL 5MW wind turbine. By applying the controller, the edgewise vibrations of wind turbine blades are significantly reduced. The reduction in the edgewise vibrations of the blades can be determined according to the location of closed-loop poles of the system. The number and locations of the intermediate actuators relative to the center of the hub are effective in the control forces. The greater the distance between the control actuators and center of the hub, the lower the control force to reduce a certain amount of edgewise vibrations. In the same positions of the control actuators, as the number of control actuators increases, the force required to reduce the edgewise vibrations decreases in each actuator. Although, as the number of actuators increases, the cost of the required control equipment increases, so increasing the number of actuators does not necessarily mean increasing their efficiency over cost
  9. Keywords:
  10. Wind Turbine ; Dynamic Modeling ; Renewable Energy Resources ; Turbine Blade Vibrations Control ; Blade Vibrations ; Turbine Blades

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