Analysis and Design of Controller for Doubly-Fed Induction Generator in Wind Energy Application
Syed Sarfaraz Nawaz1, S. Tara Kalyani2

1S. Sarfaraz Nawaz*, Department of Electrical and Electronics Engineering, GRIET (JNTUH), Hyderabad (Telangana), India.
2Dr. S. Tara Kalyani, Department of Electrical and Electronics Engineering, GRIET (JNTUH), Hyderabad (Telangana), India. 

Manuscript received on June 26, 2021. | Revised Manuscript received on July 1, 2021. | Manuscript published on July 30, 2021. | PP: 12-18 | Volume-10, Issue-9, July 2021 | Retrieval Number: 100.1/ijitee.I92880710921 | DOI: 10.35940/ijitee.I9288.0710921
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Abstract: Now a days, wind energy is developing as a significant wellspring of unpolluted and eco-friendly energy to supplant the enormous scope utilization of expendable wellsprings of energy. Wind Energy is pulling in enthusiasm of analysts everywhere throughout the globe as one of the most significant inexhaustible wellspring of energy. Be that as it may, the primary confinements lie in factor speed wind vitality. The under and above Synchronous speeds are obtained by utilizing a bidirectional power flow converter. In this paper a systematic transfer function model of a Doubly Fed Induction Generator based wind turbine structure connected to grid is developed in Mat lab/Simulink environment. The control structure of generator and that of turbine is developed and implemented. A simple approach is proposed to obtain the gains of Proportional Integral (PI) controller. A systematic detail of this control structure is presented. Under varying load conditions, it is observed that the reactive power is controlled and power factor of the system is maintained close to unity by using this scheme. Stator flux situated vector control method is conveyed for both stator and rotor side converters to supply autonomous control of active and reactive power and keep the DC link voltage consistent. 
Keywords: DFIG, PI controller, Rotating coordinate system, state space analysis, Stator Flux Oriented control.