Wind energy has many advantages, no polluting gases are produced, no fuel cost besides it is an inexhaustible source. However, its cost is still too high to compete with traditional fossil sources. The yield of a wind turbine depends on three parameters: the power of the wind, the turbine power curve and the ability of the generator to respond to fluctuations in the wind. This paper presents the simulation of MPPT of a wind turbine system equipped with double fed Induction Generator (DFIG) under Matlab Simulink program, first time we simulated all the conversion chain with complete model of DFIG and vector control in second step then the extracted maximum power MPPT strategy is applied, this command is effective and has several advantages. Its offered to maximize kept the power delivered to network despite all the changed parameter.