The present invention relates to an MPPT control method through estimating wind speed of a wind power generation system which comprises the steps: (a) deriving a rotational energy of a blade; (b) deriving a tip speed ratio from the rotational energy of the blade; (c) deriving a pitch angle and the tip speed ratio of an efficiency coefficient as a non-linear function and approximating the derived non-linear function to be a third degree polynomial; (d) deriving the sum of a squared error; (e) deriving the sum of the squared error as a fourth degree polynomial; and (f) estimating current wind speed by deriving a solution to the third degree polynomial. [Reference numerals] (AA) Start; (BB) End; (S10) Deriving a rotational energy of a blade; (S20) Deriving a tip speed ratio from the rotational energy of the blade; (S30) Deriving as a non-linear function through [Equation 3] and approximating the derived non-linear function to be a third degree polynomial through [Equation 4]; (S40) Deriving the sum of a squared error relative to the [Equation 3] and the [Equation 4] through [Equation 5]; (S50) Deriving the derived sum of the squared error as a fourth degree polynomial such as [Equation 6]; (S60) Estimating current wind speed by deriving a solution to the third degree polynomial through [Equation 7]
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