Variable gain PI with fractional order for doubly fed induction generator used in a chain of wind power conversion

Currently, variable gain PI (VGPI) controllers are used in several applications. Its structure is built around PI controller tuning and usually an entire number is chosen for the order or degree. This paper deals with a study of a VGPI with fractional order (VGPIFO). For the PI controller tuning, a method called general method (MG) is adopted. Then, the VGPI one is established. The proposed controller is applied on a doubly fed induction generator (DFIG) inserted in a chain of wind power conversion. Simulation results show that this new controller leads to good performances as test tracking, disturbance rejection and robustness with respect to system operation variation and parameters variation.