Importance

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Abstract

The present invention relates to an apparatus and a method for reducing current ripple in a double fed induction wind power generating system. More particularly, the apparatus comprises: a ripple current sensing unit for classifying the current of a rotor of a generator into normal current and ripple current which is a current component having a frequency that is the same as the frequency of a system power source on the basis of the value obtained by slip angle-based coordinate conversion of the current of the rotor, extracting the classified ripple current, and transmitting the extracted ripple current to a ripple current control unit; and a ripple current control unit for generating a compensation voltage value on the basis of the ripple current received from the ripple current sensing unit and adding the generated compensation voltage value to a reference rotor voltage value input to a converter of a rotor side of the generator so as to reduce the current ripple generated in the current of the rotor of the generator. Thus, according to the present invention, current ripple generated in the current flowing along the rotor of a double fed induction wind power generator during a voltage drop of a system power source may be reduced, thus improving the quality of the power being supplied to the system power source.

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First Claim