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Article
Improved direct torque control of an induction generator used in a wind conversion system connected to the grid
ISA Transactions, Elsevier (2013)
  • Djamila Rekioua, Pr
Abstract

This paper presents a modulated hysteresis direct torque control (MHDTC) applied to an induction generator (IG) used in wind energy conversion systems (WECs) connected to the electrical grid through a back-to-back converter. The principle of this strategy consists in superposing to the torque reference a triangular signal, as in the PWM strategy, with the desired switching frequency. This new modulated reference is compared to the estimated torque by using a hysteresis controller as in the classical direct torque control (DTC). The aim of this new approach is to lead to a constant frequency and low THD in grid current with a unit power factor and a minimum voltage variation despite the wind variation. To highlight the effectiveness of the proposed method, a comparison was made with classical DTC and field oriented control method (FOC). The obtained simulation results, with a variable wind profile, show an adequate dynamic of the conversion system using the proposed method compared to the classical approaches

Keywords
  • Direct torque control,
  • Field oriented control method (FOC),
  • Induction generator (IG);,
  • Modulated hysteresis controller,
  • Modulated hysteresis direct torque control (MHDTC),
  • Wind conversion system
Publication Date
2013
Citation Information
Djamila Rekioua. "Improved direct torque control of an induction generator used in a wind conversion system connected to the grid" ISA Transactions, Elsevier (2013)
Available at: http://works.bepress.com/djamila_rekioua/50/