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-Wua), Ke De-Ping†a), Sun Yuan-Zhanga), Daniel Kirschenb), Wang Yi-Shenb), Hu Yuan-Chaoa)
       
Overall scheme diagram of the proposed control strategy. Here, w r and w ref are real rotor speed and rotor speed references, respectively, θ s, θ r, and θ 1 are the stator, rotor and slip electrical angulars, respectively. w s and w r are stator and rotor angular speeds, respectively.