An input-to-state stability approach to inertial frequency response analysis of doubly-fed induction generator-based wind turbines

Toulabi, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TEC.2017.2696510
  3. Abstract:
  4. Due to the proliferation of wind turbines in power networks, participation of doubly-fed induction generator (DFIG)-based wind turbines in the frequency regulation task is attracting more attention during recent decades. It is a challenge to design an effective DFIG's auxiliary frequency controller, since back-to-back converters used in DFIG make the possibility of large deviations in current and speed of rotor during frequency support period. Hence, it is necessary to use exact expression of DFIG's output power in the frequency-related studies. This paper addresses this challenge by developing a nonlinear dynamic model for the DFIG's output power integrated into the dynamic model of power grid. A state feedback controller is proposed by considering whether the DFIGs participate in the frequency regulation task or not. The stability of overall system is studied using a nonlinear control tool, namely, the input-to-state stability (ISS). We provide the sufficient conditions for the controller's parameters to guarantee the power grid with wind speed and load variations to be ISS. The controller is then embedded in the DFIG's detailed model and simulations are performed to evaluate its performance. Negligible recovery period, higher output power, and smoother frequency response are observed by using the proposed controller. © 1986-2012 IEEE
  5. Keywords:
  6. Doubly-fed induction generator (DFIG)-based wind turbine ; Frequency controller ; Input-to-state stability (ISS) ; Controllers ; Dynamic models ; Electric fault currents ; Electric generators ; Electric power system control ; Electric power transmission networks ; Frequency response ; Stability ; State feedback ; Wind ; Wind turbines ; Back-to-back converter ; Doubly fed induction generator (DFIG) ; Doubly fed induction generators ; Frequency controllers ; Frequency regulations ; Inertial frequency ; Input-to-state stability ; State feedback controller ; Asynchronous generators
  7. Source: IEEE Transactions on Energy Conversion ; Volume 32, Issue 4 , 2017 , Pages 1418-1431 ; 08858969 (ISSN)
  8. URL: http://ieeexplore.ieee.org/document/7906598/?reload=true