title: Improved direct torque control of an induction generator used in a wind conversion system connected to the grid.
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.
authors.affiliation: Laboratoire de Technologie Industrielle et de l'Information, Bejaia University, Algeria.
authors.forename: Radia
authors.initials: R
authors.lastname: Abdelli
authors.forename: Djamila
authors.initials: D
authors.lastname: Rekioua
authors.forename: Toufik
authors.initials: T
authors.lastname: Rekioua
authors.forename: Abdelmounaïm
authors.initials: A
authors.lastname: Tounzi
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D011211:Electric Power Supplies; D004560:Electricity; D004735:Energy Transfer; D005246:Feedback; D008962:Models, Theoretical