Amin Alavi Eshkaftaki - Department of electrical engineering, Shahrekord University, Shahrekord, Iran
Abdorreza Rabiee - Department of electrical engineering, Shahrekord University, Shahrekord, Iran
Abbas Kargar - Department of electrical engineering, Shahrekord University, Shahrekord, Iran
Samad Taghipour Boroujeni - Department of electrical engineering, Shahrekord University, Shahrekord, Iran

Stability of synchronous generator and its improvement is one of the important problems in the power system. Stability can divided to three kinds: steady state, dynamic and transient which we study about dynamic stability in this paper. Nowadays pollution crisis in one hand and running out resources of fossil fuels on the other hand are caused increasing wind generations using based on doubly fed induction generator (DFIG). One of the abilities of DFIG is using it in order to improve dynamic stability in synchronous generator. In this paper, a suggested controller is used in the reactive power band of DFIG in order to increase dynamic stability of synchronous generator. This controller use two feedbacks of speed derivation in synchronous generator and DFIG electromagnetic torque. Finally, the simulation results for two disturbances in the test network show the suggested controller works correctly and the dynamic stability of synchronous generator has been increased remarkably.

Dynamic Stability, Synchronous Generator, Doubly Fed Induction Generator (DFIG), Reactive Power Band of DFIG, Speed Derivation Feedback, DFIG Electromagnetic Torque Feedback