Study the impact of transient state on the doubly fed induction generator for various wind speeds.

Recently, renewable resources such as wind, hydro, and tidal have experienced a rapid development. Electricity production, based on wind, has been concentrated on a large scale. Additionally, a doubly fed induction generator has been used in wind farms on a large scale. This machine is influenced by the multiple transient states that are happening in the grid. Many researchers studied the effect of voltage-dip on DFIG performance; none of them studied the effect of voltage-dip sharing with wind-speed changing for both sub- and hyper-synchronous modes. In this paper, DFIG behavior is investigated under a transient state which is represented by 3-phase voltage-dip, in both operation modes (sub-synchronous & hyper-synchronous) with various values of the wind speed. Based on MATLAB Simulink, the various DFIG parameters are extracted to determine the relation between voltage-dip, variable wind speed, and DFIG performance. Results show that the parameters that are affected were rotor-current, rotor-voltage, and DC-Link voltage, while stator-current and stator-flux are not affected. It is also shown that DC-Link voltage values are smaller in the hyper-synchronous mode compared with sub-synchronous one. [ABSTRACT FROM AUTHOR]