CONTROL OF A DOUBLY-FED INDUCTION GENERATOR FOR WIND ENERGYCONVERSION SYSTEMS. Abstract 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 RST. Their respective performances are compared in terms of power reference tracking, response to sudden speed variations, sensitivity to perturbations and robustness against machine parameters variations.overcome this problem, a converter, which must be dimensioned for the totality of the power exchanged, can be placed between the stator and the network. In order to enable variable speed operations with a lower rated power converter, doubly-fed induction generator (DFIG) can be used as shown on Fig. 1. The stator is directly connected to the grid and the rotor is fed to magnetize the machine. In this paper, the control of electrical power exchanged between the stator of the DFIG and the power network by controlling independently the torque (consequently the active power) and the reactive power is presented [2]. Several investigations have been developed in this direction using cycloconverters as converters and classical proportional-integral regulators [3-5]. In our case, after modeling the DFIG and choosing the appropriate d-q reference frame, active and reactive powers are controlled using respectively Integral-Proportional (PI) and an RST controller based on pole placement theory. Their performances are compared in terms of reference tracking, sensitivity to perturbations and robustness against machine's parameters variations.