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Design of a Robust Active Controller to Suppress the Undesirable Vibration of Power Transmission Lines by Using the Intermediate Actuators and Optimization of Their Locations

Zolfaghari, Saghar | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55338 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moradi, Hamed
  7. Abstract:
  8. Power transmission lines, which are responsible for the distribution and transmission of electrical energy from the power plant to the consumer areas, due to their characteristics such as long length and flexibility with low structural damping, face environmental irritations, especially the galloping phenomenon, causing many damages annually. In this study, it has been attempted to reduce the vibrations of power transmission lines by designing a robust active control and by using intermediate actuators in such a way that the failures of these lines can be prevented. For this purpose, linear modeling of the system and designing the controller using the pole replacement method have been done. Then, by generalizing the linear model of the system to the non-linear model, the design of the controller has been done using the linear feedback method. Further, by optimizing the number and location of operators and considering the saturation limit for them, the minimum force required to control the vibrations of the system has been obtained. Finally, taking into account the uncertainties in the system and the optimal conditions for the control forces, it has been tried to design the controller using the H∞ method in such a way that the system is resistant to the existing uncertainties and can achieve the robust performance goals. In the end, from the simulation results, it can be seen that the presented model has the necessary efficiency in showing the vibration behavior of the system in the presence of galloping stimuli and the designed controller with two control forces concentrated in optimal places is effective in reducing system vibrations in a short period of time
  9. Keywords:
  10. Galloping ; Active Control ; Uncertainty ; Power Transmission Line ; Transmission Line Modeling ; Robust Performance ; Actuator Optimal Position ; Actuator Saturation Limit

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