Sliding Mode Control of a Doubly-fed Induction Generator for Wind Energy Conversion

This paper deals with a variable speed device to produce electrical energy on a power network, based on a doubly-fed induction machine used in generating mode (DFIG). This device is intended to equip nacelles of wind turbines. First, a mathematical model of the machine written in an appropriate d-q reference frame is established to investigate simulations. In order to control the power flowing between the stator of the DFIG and the power network, a control law is synthesized using two types of controllers: PI and SMC (Sliding Mode Control). Their performances are compared in terms of power reference tracking, response to sudden speed variations, sensitivity to perturbations and robustness against machine parameters variations.