Transient Analysis of DFIG Wind Turbine during Voltage Sag

Wind power plants often located in remote areas are characterized by weak grids and they are frequently subjected to power system disturbance like voltage sag, short circuit fault and dynamic loading. This paper presents a study of the dynamic performance of variable speed DFIG-coupled wind turbine plant under power system disturbance. Modeling and simulation of induction machines, power system components and controller design is done using MATLAB. Vector control approach is being implemented in MATLAB/SIMULINK platform for DFIG active, reactive power control, and variable speed operation. Results obtained from simulation are enumerated and verified from literature. Index term- Double fed induction generator (DFIG), vector control, voltage sag. Both fixed speed squirrel cage induction machine and variable speed double fed induction generators are widely used for Wind Energy conversion system. Recently DFIG find increasing application in wind-turbine generation. DFIG has the ability to control the active and reactive power and maintain constant frequency operation. With wind speed variation or under power system disturbance, the injected rotor voltage, current or the frequency o