Generate electricity from a variable mechanical energy source, such as wind, deals with methods to track the maximum extraction power point of the generator since they can operate under a wide random speed range. This paper presents a novel control strategy of a three-phase self-excited induction generator (SEIG) in order to get the maximum active power that this generator is capable to provide, for a given rotor speed. This proposition of maximum power point tracking (MPPT) is based on Perturbation and Observation (PO) method at different speeds of the rotor. Thus, MPPT uses a slip as perturbed variable and the active power as observed variable. Finally, the analysis of a rigorous simulations is presented, showing the behavior of the generator system with various given speed values applied to the generator rotor in a wide working range, verifying its feasibility and validity.