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It is expected that increasing amount of distributed generation (DG) will be connected to electrical power systems in the near future. When these generations are in small amounts, their impacts on power system dynamics will be negligible. But if the penetration level becomes higher, distributed generations may start to influence the dynamic behavior of a power system as a whole and its impacts is no longer restricted to distribution network. In this paper transient stability of a power system is evaluated when large amounts of wind farm with the DFIG technology is connected to the system. We use Digsilent software as our simulating program. Simulation studies are carried out to demonstrate and compare the transient performance of IEEE 10 machine-39 bus test system with and without wind power integration during a severe grid fault.