Paper title: A NEW METHOD OF PREDICTIVE DIRECT TORQUE CONTROL FOR DOUBLY FED INDUCTION GENERATOR UNDER UNBALANCED GRID VOLTAGE
Author(s): ALI IZANLO, MOHAMMAD VERIJ KAZEMI, S. ASGHAR GHOLAMIAN,
Abstract: In this paper, a new predictive direct torque control (PDTC) method is presented for doubly fed induction generator (DFIG)
under unbalanced grid voltage. In PDTC, the future behavior of the system is first predicted using the system model, the
appropriate voltage vector is then selected using an optimized cost function in each control period. This method is simple and
has excellent steady-state and transient performance, because uses from both predicted and reference values. The main
advantages of proposed method are that all of the voltage vectors examine in cost function and the voltage vector that minimizes
cost function will be applied during the next sampling period. Also, two control targets presented for unbalanced condition. The
first target eliminates electromagnetic torque oscillation and the second target eliminates active power pulsations. The
simulation was conducted on a 1 MW DFIG and results shows the effectiveness and robustness of new DTC method. It can be
seen that the torque and flux ripples are reduced and their transient response are within a few milliseconds.
Keywords: Doubly fed induction generator (DFIG), Predictive direct torque control (PDTC), Unbalanced stator voltage
conditions Year: 2018 | Tome: 63 | Issue: 3 | Pp.: 332-337
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