RST Control of a Doubly-fed Induction Generator for Wind Energy Conversion Makhlouf Laakam Research unit of Systems Photovoltaic, Wind and Geothermal. National Engineering School of Gabes (ENIG). Gabes,Tunisia. Lassaâd Sbita Research unit of Systems Photovoltaic, Wind and Geothermal. National Engineering School of Gabes (ENIG). Gabes,Tunisia. Abstract—The purpose of thispaper is to studya differentcontrol strategyofactive and reactive powera doubly fed induction generator (DFIG)used for energy generation. The DFIG model we used is obtained by the application of the Park transformation. To control the power exchanged between the DFIG and the grid, a vector control strategy using integral- proportional (PI) controller and polynomial RST controller based on pole-placement theory is presented.The simulation calculations were achieved by using MATLAB®-SIMULINK® package. The results obtained from different operating points, illustrate the efficient control performances of the system Keywords—DFIG; Wind Turbine; Variable Speed; Power control; PI controller; RST controller. I. INTRODUCTION Today, wind energy has become a viable solution for the generation of electrical energy. Although the majority of installed wind turbines have a fixed speed, the number of wind turbines which have a variable speed is increasing [1]. The double-fed asynchronous generator with a vectorial control is a machine that has excellent performance and is commonly used in wind turbine industry. There are many reasons for the use of a double-fed induction generator for a variable speed wind turbine; for instance, the reduction of efforts on the mechanical parts, the reduction of noise and the ability to control the active and reactive power. The wind system which uses DGIF and a "back-to-back" converter that connects the rotor generator to the grid has many advantages. An advantage of this structure is that the used power converters are designed to flow a fraction of the total power of the system [2-3]. The performances of this system depend not only on the DFIG, but also on how the "back-to-back" converter is controlled. While the rotor side converter controls the active and reactive power produced by the generator, the grid side converter allows us to control the DC bus voltage and the power factor of the grid side. In order to control the stator exchanged active and reactive power between the DFIG and the grid, a vector-control strategy is used to control PI and RST controllers independently. The aim of these controllers is to obtain high dynamic performances. The proposed control system is simulated using MATLAB®-SIMULINK® package. The obtained results are presented and discussed. II. MODELLING OF THE STUDIED SYSTEM A. The studied system The scheme of the device studied is given in the Fig.1.The system studied is made up of a wind turbine and a DFIG directly connected through the stator to the grid and supplied through the rotor by AC/DC and DC/AC Converter. Fig. 1. Wind system conversion B. The double fed induction generator model The electrical equations of DFIG in dq reference can be written as follows [4-5]: 2507 Vol. 3 Issue 3, March - 2014 International Journal of Engineering Research & Technology (IJERT) ISSN: 2278-0181 www.ijert.org IJERTV3IS031458 International Journal of Engineering Research & Technology (IJERT)