Simulation Study of DFIG Wind Turbine under Grid Fault Open-Circuit

During recent years wind turbine technology has undergone rapid developments. Doubly fed induction generators (DFIG) are very sensitive to the disturbances of grid, the stator of DFIG should be kept connection to the grid faults during period. The flux dynamic response and rotor overvoltage induced by the grid faults and recovery threaten to damage the vulnerable rotor converter. By the from the basic mathematical model doubly-fed generator q-d coordinates reference frame, using the MATLAB/SIMULINK platform to 1.5 MW wind power system simulation model is established. Based on analysis of change of the DFIG stator and rotor flux, voltage, current and active and reactive power, the open-circuit faults of grid and its effect on current and other variables of DFIG were analyzed in the beginning. In the present work, we addressed open-circuits faults of grid situations that have shown their influence on the generator and the behavior of the wind over the defects which are briefly discussed based on simulation results.