Research on decoupling control and low voltage ride-through of a double-fed wind power system

This paper first studied a kind of vector control strategies based on the stator flux-oriented vector of the double-fed AC excited generator in the case of power grid voltage stable, establishes the simulation model based on Matlab/Simulink and simulation results are given. The results indicate that the stator flux-oriented vector control can achieve the regulation of active and reactive power for a double-fed induction generator (DFIG) independently. In order to improve DFIG uninterrupted running ability in the case of power grid voltage drop, on the basis of the DFIG precise mathematical model, this paper proposes an improved control mode, and carries on a simulation comparative analysis for the DFIG dynamic procedure under the condition of grid voltage drop before and after. The results show that the improved scheme can suppress the impact of the rotor current effectively and can improve the uninterrupted running ability of DFIG in the case of power grid voltage drop.