Research on the Control Strategy of Low Voltage Ride-Through for Doubly Fed Induction Generator

With the development of modern wind energy generation, higher requirements to the grid in case of a failure were raised. In order to faciliate the recovery of power, while voltage dips in a certain range, protecting the rotor side converter and providing reactive power to the grid are both needed according to the requirements. This paper takes DFIG for example, in order to protect the rotor side converter, we analyze different voltage phase angles and DFIG¡¯s electromagnetic transition process while the voltage dips. Proposing a method to eliminate harmonic components during transition process, that the proposed control strategy. Simulation results show that the control strategy can achieve the purpose of protecting the rotor side converter, while eliminating the harmonic currents of stator side and rotor side under voltage dips.