This paper deals with the problems of nonlinear interaction of large capacity wind farm in stressed power systems in the presence of FACTS controllers. The study is performed on an IEEE modified test system using the nonlinear modal analysis based on the Modal Series (MS) method. As the installed capacity of renewable energy especially the wind energy increases, the connection of the wind farms to the grid should be studied from different viewpoints. The dynamic performance of this composite power system is an important issue and should be investigated carefully especially in stressed conditions and different operating points of DFIG controllers. The nonlinear interactions will complicate the dynamic behavior of power systems. If such interaction exists between wind farms and other system components such as FACTS controllers and is quantitatively significant, the stability of wind plant is jeopardized.

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