Predictive direct torque control of DFIG under unbalanced and distorted stator voltage conditions

In this paper, Performance of predictive direct torque control (PDTC) of DFIG under unbalanced and distorted grid voltage is investigated. Two different control targets can be applied to these voltage conditions without extracting the negative sequence voltage, 5^th or 7^th voltage harmonics. The first target eliminates electromagnetic torque oscillations and the second target eliminates active power pulsations. The rotor flux slope during these voltage conditions is the same as ideal voltage conditions, so there is no need to modify voltage vector sequence. The proposed control strategies are tested for 2 MW DFIG under voltage disturbance conditions in MATLAB/SIMULINK environment. Results show the effectiveness of the proposed method under voltage disturbance conditions.