A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

Shen Yang-Wu^a), Ke De-Ping†^a), Sun Yuan-Zhang^a), Daniel Kirschen^b), Wang Yi-Shen^b), Hu Yuan-Chao^a)

Block diagram of the fast identification algorithm of voltage sequence components. Here, γ is the delay angular; ω is the grid frequency. v _{s α} and v _{s β} are the α -axis component and β -axis component of grid voltage in the stationary frame.