DefinePK

Abstract

A new control technique is proposed in this work for efficient operation of DFIG (Doubly Fed Induction Generator) operating in unbalanced condition of grid voltage using Model Predictive Direct Power Control (MPDPC) along with a power compensator. In MPDPC method, a controlled system model predicts the imminent behavior of the system over a long range to regulate the direct reactive and active powers in the stator instantaneously. Also, MPDPC selects the appropriate rotor voltage vector which has least ripples using an optimization cost function. Then, power compensation scheme generates power references to MPDPC without the amputation of negative sequence components of the stator current. The proposed method reduces the distortions in the stator currents and eliminates the electromagnetic torque oscillations. The effectiveness of the proposed control algorithm is realized in Matlab/Simulink and the dynamic response of the controller in improving the power quality is studied.