Doubly-fed induction generator（DFIG） has been widely used in the variable-speed constant- frequency（VSCF） wind energy generation system. Vector control is already applied in the DFIG control， which makes the DFIG achieve good performance in the wind energy generation. But in two typical traditional vector control schemes， the stator magnetizing current is considered invariant to simplify the design of rotor current inner-loop controller. The two schemes are capable of performing very well when the grid is in normal condition. However， when the grid disturbance， such as grid voltage dip or swell fault， occurs， the control performance will be getting worse， the rotor over current will appear， which will reduce the ride-through capability of the DFIG wind energy generation system. Based on the precise model of the DFIG， the deficiency of the traditional vector control is also deeply investigated. The improved control schemes for the two typical traditional vector control used in DFIG are proposed， and the simulation study of the proposed and traditional control schemes is carried out. The validity of the proposed modified schemes to control the rotor current and improve the ride-through ability of the DFIG wind energy generation system is proved by the comparative study.