Control of Wind driven Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions

摘要

Wind energy system based on Doubly Fed Induction Generator (DFIG) are very sensitive to grid disturbance such as voltage sag. The Low Voltage Ride through capability during grid disturbance is one of the core requirements to ensure stability in power grid during transient condition. In this paper the authors analyse system under abnormal grid voltage situation and proposes a control strategy enabling the DFIG to ride through sudden variation in grid voltage. These control schemes include the generator-side converter control, Rotor-side converter control, and crow bar protection.