The present invention, current ripple, reduction of Doubly inductive wind power generation system apparatus and relates to a method, and more particularly to a rotor current based an the slip angle coordinate transform values ​​of the normal current and the frequency of the system power of the generator separated by the current component of the ripple current has the same frequency, and to extract the separated ripple current sensing ripple current to be transmitted to the ripple current control unit; And a time reference rotor voltage value input to the rotor side converter of a generator to generate a compensation voltage is based on a ripple current received from the ripple current sensor addition, by reducing the current ripple generated in the rotor current of the generator ripple current control unit; It includes.
Therefore, according to the present invention, compared to conventional Doubly inductive wind power system, the current ripple generated in the current flowing through the rotor of a wind turbine Doubly inductive voltage drop during the grid power source is reduced to be supplied to the grid power supply the effect of improving the power quality.