The present invention provides a wind power generating system. An AC excitation type generator used in a power generation device, a rotor winding is AC-excited at a slip frequency by means of a converter, so that voltage generated on the side of stator can be made to be equal to the system frequency by excitation of the rotor. However, low-order harmonics components (for example, 5th- and 7th-order) are contained in stator voltage depending on the slot structure of the stator and the rotor of the doubly-fed induction generator. Current of the converter on the system-side is distorted due to the low-order harmonics components of the stator voltage. A wind power generating system includes a unit for eliminating harmonics component of specified-high-order from inputted current detection value of a system-side converter and a unit for controlling the system-side converter using the current detection value in which harmonics are eliminated. The wind power generating system can improve the operational continuity of a system-side converter.