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Grid-fault ride-through analysis and control of wind turbines with doubly fed induction generators

Rahimi, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.epsr.2009.08.019
  3. Publisher: 2010
  4. Abstract:
  5. This paper deals with the low voltage ride-through (LVRT) control of wind turbines with doubly fed induction generators (DFIGs) under symmetrical voltage dips. The investigation first develops a mathematical formula for the rotor current and rotor voltage when DFIG is subjected to a symmetrical voltage dip. From the analysis, the reasons of rotor inrush current and factors influencing it are inferred. Then, a control scheme enhancing the wind turbine LVRT capability is designed and simulated. The proposed control scheme consists of a nonlinear control strategy applied to the rotor-side converter and a dc-link voltage control applied to the grid-side converter. It improves the damping of DFIG transient response and minimizes oscillations of rotor current, electromagnetic torque and dc-link voltage during the generator voltage dip. It also limits the peak value of these quantities. At the end, results of theoretical analyses are verified by time domain simulations
  6. Keywords:
  7. Flux damping ; Ride-through control ; Rotor short circuit current ; DC-link voltages ; Doubly fed induction generator ; Damping ; Electric fault currents ; Electric generators ; Electric potential ; Optical filters ; Strontium compounds ; Time domain analysis ; Voltage regulators ; Welds ; Wind power ; Wind turbines ; Asynchronous generators
  8. Source: Electric Power Systems Research ; Volume 80, Issue 2 , February , 2010 , Pages 184-195 ; 03787796 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S037877960900203X