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Analysis and Improvement of The Low-Voltage Ride Through Capability of Permanent-Magnet Synchronous Generator-Based Wind Turbines

Asadi Khoshouei, Ebrahim | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41815 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Permanent-magnet synchronous generators have attracted more attention in recent years due to their special advantages which make them a suitable option for variable-speed wind turbines.Low-voltage ride through capability is one of the main concerns in widespread use of wind turbines in electric grids. Nowadays wind turbines are expected to remain connected to the grid during voltage dips and support the voltage recovery process by supplying reactive power.This thesis aims at behavior analysis and performance improvement of permanent-magnet synchronous generator-based wind turbines during grid faults. A simple method is presented to overcome the over current problem of the grid-side converter in such conditions. The otherroblem of such wind turbines is due to power imbalance during voltage dips, which imposes some extra energy to the system. The use of turbine-generator inertia to absorb this energy is suggested and three different control schemes are proposed to implement this idea. Stability and desired performance of the whole system are obtained by proper design of the controllers. Practical issues on the application of the proposed methods are discussed, too.In addition, design and implementation of a general purpose experimental set-up for power electronics applications in power systems is described in the Appendix. The main goal of this test-bed is to establish experimental studies on the operation and grid connection of wind turbine generators as well as other dispersed generations and FACTS devices
  9. Keywords:
  10. Pitch Angle Control ; Permanent Magnet Synchronous Generator (PMSG)Wind Turbine ; Back-to-Back Converter ; Low Voltage Ride Through (LVRT) ; Variable Speed Wind Turbine

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