INTERNATIONAL JOURNAL of RENEWABLE ENERGY RESEARCH I. Kharchouf et al., Vol.7, No.4, 2017 Wind System Based on a Doubly Fed Induction Generator: Contribution to the Study of Electrical Energy Quality and Continuity of Service in the Voltage Dips Event Ibtissam Kharchouf* ‡ , Ahmed Essadki*, Tamou Nasser** *Higher School of Technical Education ENSET- Mohammed V University - Rabat- Morocco ** National School of Computer Science and Systems Analysis ENSIAS- Mohammed V University - Rabat- Morocco (ibtissam.kharchouf@um5s.net.ma, ahmed.essadki1@gmail.com, tnasser@ensias.ma) ‡ Corresponding Author; Ibtissam KHARCHOUF, Morocco, Tel: +212 630 647 763. Received: 10.04.2017 Accepted:22.05.2017 Abstract- Industrial machines are very sensitive to electrical defects especially the Doubly Fed Induction Generators. This high sensitivity reveals many difficulties in terms of compliance with the specifications imposed by the electrical grid operators. This article gives a proposed strategy to control the whole wind conversion chain which allows to obtain high production performances in perturbed conditions (the voltage dips). To do this, a comparison between two control strategies, one conventional and the other modified, is presented to conclude about which one guarantees a good electrical energy quality and continuity of service in the voltage dips event. The results of this work are provided by simulations in the MATLAB / SIMULINK environment. Keywords Conventional Control Strategy, Doubly Fed Induction Generator (DFIG), Modified Control Strategy, Voltage Dips, Wind Turbine. 1. Introduction Voltage dip may cause very harmful problems even if it is relatively small. This defect for the industrialist and entrepreneurs means, production stoppages, overtime for restarting processes which causes performances degradation. And to have a close idea about the disturbance costs; the dissatisfaction of customers, the risks to the safety and security of staff and of the production tools, the loss of data, etc, must also be considered [15]. To avoid all the consequences mentioned before, and any instability in the production of electrical energy, a continuation of wind turbine production even in disturbed conditions, must be assured. The objective of this research article is to propose a control strategy of the generator that can improves the performances of the wind systems in the case of a disturbed electrical grid. The emphasis is on the comparison of two stator flux control strategies (conventional and modified) of the DFIG (Doubly Fed Induction Generator) [2], [3]. On the one hand, the conventional approach allows to obtain the mode of operation sought by positioning in an optimal way the currents vectors and the resulting flows vectors. On the other hand, the modified approach considers the dynamics of the stator flux [3]. The fault current in the rotor windings and the overvoltage in the DC bus are limited due to the proposed control strategy. The wind generator used is a three-axis horizontal wind turbine using a Doubly Fed Induction Generator (DFIG). Nomenclatures PWM Pulse Width Modulation. C r Resistive torque (N.m). C aer Aerodynamic torque (N.m). C mec Mechanical torque (N.m). Ω t Turbine speed (Rad/s).