Improved SMC Approach for Rotor-Side Converter of DFIG-Based on Stator Flux Estimator Using a Programmable Low Pass Filter

This paper deals with an improved direct power control (DPC) of Doubly-Fed Induction Generator, the adopted approach applies a nonlinear sliding mode control (SMC) scheme to directly calculate the required rotor side converter's (RSC) control voltage. An improved stator flux estimation method is proposed, using an integrator scheme with a closed-loop dc offset compensation algorithm. The proposed strategy consists on an improved programmable low-pass filter. The theoretical principle of this method is discussed. Simulation results present a good dynamic response, an excellent performance and verify the effectiveness of the adopted strategy. Some experimental results are shown, in this paper, using a real time system controller based on dSpace 1104. Experimental results show the validity of the proposed control strategy.