DTC, DPC and nonlinear vector control strategies applied to the DFIG operated at variable speed

Abstract

Abstract:- In this paper we present the modeling and control designs for a variable-speed constant-frequency wind energy conversion system using double fed induction generator (DFIG). The aim of this paper is to design and compare two distinct control strategies to control the rotor side power converter and two control strategies to control the grid side power converter. For the rotor side converter (RSC), a nonlinear vector control strategy using the second Lyapunov approach is firstly developed. Secondly, a direct torque control strategy, constructed around two hysteresis controllers that allow flux and torque regulation, is presented. For the grid side converter (GSC), the network voltage vector oriented control based on PI controllers and a direct power control strategy constructed around two hysteresis controllers that allow grid injected power regulation, are presented, respectively. Simulation results have shown good performances of the wind energy converter system operate under typical wind variations and every propose control strategies.