Modeling and control of a wind turbine driven doubly fed induction generator

Abstract

This paper presents the simulation results of a grid-connected wind driven doubly fed induction machine (DFIM) together with some real machine performance results. The modeling of the machine considers operating conditions below and above synchronous speed, which are actually achieved by means of a double-sided PWM converter joining the machine rotor to the grid. In order to decouple the active and reactive powers generated by the machine, stator-flux-oriented vector control is applied. The wind generator mathematical model developed in this paper is used to show how such a control strategy offers the possibility of controlling the power factor of the energy to be generated. Index Terms-Doubly fed induction machine, power converter, power factor, vector control, wind power generation. I. NOMENCLATURE Stator side power factor. Wind turbine net power factor. Grid frequency. Stator magnetising current space phasor modulus. , Direct-and quadrature-axis stator magnetising current components respectively, expressed in the stationary reference frame. Rotor current space phasor modulus. , Direct-and quadrature-axis rotor current components respectively, expressed in the stationary reference frame. , Direct-and quadrature-axis rotor current components respectively, expressed in the stator-flux-oriented reference frame. , Reference values of the rotor current and components, respectively. , Direct-and quadrature-axis rotor current components respectively, expressed in the rotor natural reference frame. , Direct-and quadrature-axis stator current components respectively, expressed in the stationary reference frame.

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