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Power System Frequency Control Enhancement Considering Wind Power Plants Participation

Toulabi, Mohammad Reza | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50800 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ranjbar, Ali Mohammad
  7. Abstract:
  8. Synthetic inertial frequency response has attracted increasing attention due to the paradigm shift in power generation from synchronous generators toward wind turbines. Due to application of back-to-back converters in the structure of variable speed wind turbines (VSWTs), their shaft speeds become decoupled from the system frequency and thus, they cannot provide intrinsic inertial response. However, this type of response can be emulated via an extra auxiliary frequency controller or by modifying the conventional control system of the VSWTs. To achieve this goal, a frequency model of VSWT is developed in this dissertation. The power system's load-generation mismatch model is integrated into the obtained frequency model to equip the VSWTs with the inertial response . Besides, to prevent complication of design process, the equivalent droop concept is applied to model the conventional units. The developed frequency model is then extended to the wind farm level and some linear/nonlinear controllers are proposed based on the developed model. The proposed controllers are embedded in the detailed model of the VSWTs in MATLAB/Simulink environment. Extensive investigations including time domain simulations and eigenvalue analyses are carried out to evaluate the performance of the proposed controllers. Impacts of the most important practical operational constraints as well as involved disturbances are analyzed and several deductions are derived. Results verify the superiority and appropriateness of the proposed controllers at each step
  9. Keywords:
  10. Frequency Model ; Wind Farms ; Frequency Control ; Inertial Response

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