Dynamic Behavior of DFIG Rotor During Low Voltage Ride-Through

The ability of low votage ride-through(LVRT) is the key problem to realize the uninterrupted operation for the wind power generation.Doubly fed induction generators(DFIG) is one of the most widely used VSCF wind turbines today,in order to study the LVRT technology for DFIG,based on the mathematical model of the DFIG,this paper analyzes the dynamic response characteristics of voltage drop and voltage recovery with different recovery time of DFIG in detail,calculates out the maximum instantaneous rotor voltage when the voltage drop and the maximum and minimum rotor voltage when voltage recovery,and provides the simulation waveforms.The study work of this paper provides a theoretical basis for designing circuit parameters and control strategy for LVRT protection.