In this paper the role of wind energy conversion systems (WECS) was investigated, In particular, variable speed wind turbines (VSWT) based on double-fed induction-generator (DFIG) in control and the optimization frequency with different wind penetration in the isolated system including Traditional Thermal and Non-thermal units have been investigated too. DFIG is capable of providing power at different mechanical speeds and reducing the Instantaneous speed, thus the release of stored mechanical energy; it is able to support traditional units of frequency tuning system. By achieving this through setting the desired speed, controlling DFIG at different levels of wind penetration is possible. This technique utilizes the particle swarm optimization (PSO) algorithm. The simulation results have been compared to the integral of squared error (ISE). The optimal penetration of WECSs by considering changing parameters in the microgrid (MG) frequency is investigated. The presence of wind turbines has been shown to improve the oscillation frequency and In particular the penetration rate of the wind turbine in the MG. The best frequency control will be achieved. To achieve the computing purposes, use of intelligent algorithms is much better than the methods trial and error methods.

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