A Comparative Study for Rotor Side Converter Controller of a DFIG-Based Wind Turbine, Using Direct Power Control, Carrier-Based PWM Voltage Control and Hysteresis Current Control StrategiesAbstract views: 30 / PDF downloads: 16
Keywords:Wind turbine, Doubly-fed induction generator, Direct power control, Carrier based pulse width modulation, Hysteresis current control, Voltage source converter (VSC).
This paper investigates and studies the voltage source converter controller performance of a doubly-fed induction generator (DFIG) by
using three control methods based on direct power control (DPC), carrier based pulse width modulation (CB-PWM) voltage control and
hysteresis current control, and then the results have been compared with each other in different scenarios. This paper focuses on the rotor
side converter control of the DFIG, aiming at active and reactive power outputs control, to demonstrate the effectiveness of the control
strategies. First simulation section shows the performance of mentioned strategies during variation of rotor speed, from sub-synchronous to
super-synchronous. In the second section the value of stator resistance, applied in simulation, have been allocated 70% and 130% of the rated
value to determine the robustness of methods despite the error in stator resistance value estimation. In the next scenario, the DFIG is assumed
in torque control mode which the input mechanical power of DFIG is provided by a wind turbine. Finally the benefits and drawbacks of
methods have been evaluated. The simulation has been accomplished by PSCAD/EMTDC software and the generator rated power is 2MW.