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Coordinated control approaches for low-voltage ride-through enhancement in wind turbines with doubly fed induction generators

Rahimi, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TEC.2010.2050485
  3. Abstract:
  4. This paper deals with the coordinated control of rotor- and grid-side converters in wind turbines with doubly fed induction generators (DFIGs) to improve the low-voltage ride-through capability. The rotor-side converter control and additional equipment, called stator damping resistor, are used to limit the rotor inrush current and to reduce the oscillations and settling time of DFIG transient response during the voltage dip. Also, the grid-side converter is controlled to limit the dc-link overvoltage during the voltage drop. It is found that the dynamics of the grid-side converter and dc-link voltage exhibit nonminimum phase behavior, and thus there is an inherent limitation on the achievable dynamic response during the fault. Since the dc-link dynamics is nonlinear, the linear control scheme cannot properly limit the dc-link voltage under large voltage dips. Thus, a nonlinear control scheme applied to the grid-side converter is proposed, which stabilizes the internal dynamics and limits the dc-link voltage fluctuations during the fault. The proposed ride-through approaches limit the peak values of rotor current and dc-link voltage at the instants of occurring and clearing the fault. They also limit the oscillations of electromagnetic torque, and consequently, improve the DFIG voltage dip behavior
  5. Keywords:
  6. Coordinated control ; Dc-link voltage ; Low voltage ride through ; Wind turbine ; Additional equipment ; Co-ordinated control ; Damping resistors ; Dc-link ; DC-link voltages ; Doubly fed induction generator (DFIG) ; Doubly fed induction generators ; Electromagnetic torques ; Grid-side converter ; In-rush current ; Inherent limitations ; Internal dynamics ; Linear controls ; Low-voltage ride-through ; Non linear control ; Non-minimum phase behavior ; Over-voltages ; Peak values ; Ride-through ; Rotor current ; Rotor-side converter ; Settling time ; Transient response ; Voltage dip ; Voltage drop ; Asynchronous generators ; Dynamic response ; Linear control systems ; Wind power ; Wind turbines ; Electric fault currents
  7. Source: IEEE Transactions on Energy Conversion ; Volume 25, Issue 3 , 2010 , Pages 873-883 ; 08858969 (ISSN)
  8. URL: http://ieeexplore.ieee.org/document/5552157