Characteristic study of vector-controlled doubly-fed induction generator in stator-flux-oriented frame

The doubly-fed induction generator (DFIG) is a special variable-speed induction machine that is widely utilized in modern large wind turbine generators. This article focuses on the DFIG characteristic study in the stator-flux-oriented frame. Compared to traditional approaches, the specific features of this article are (1) a DFIG steady-state model in the d-q reference frame, (2) simulation-based characteristic study under general d-q control strategies in the stator-flux-oriented frame, (3) a numerical iteration technique, (4) power simulation from both the stator and rotor paths, and (5) an integrated study that enables assessment of various DFIG parametric data simultaneously in an integrative environment. In addition, transient simulation using the MatLab SimPowerSystem is developed to validate the effectiveness of steady-state results and to further investigate a DFIG in a transient environment. Extensive simulation-based analysis is performed to inspect how DFIG characteristics are affected by different d-q control conditions in the stator-flux-oriented frame, such as torque-speed and real and reactive power versus speed characteristics.