Patent ID: 7679208

Claim:
A pitch control apparatus for controlling a pitch value in a wind power generation system, the pitch control apparatus comprising: a generator comparing unit configured to calculate an error signal based on a difference between a generator measurement signal and a generator reference signal, the generator measurement signal corresponding with an operation of the power generation system; a reference pitch calculating unit configured to calculate a reference pitch value using the error signal; a compensation pitch calculating unit configured to calculate a compensation pitch value using an error value from the wind power generation system; and a pitch calculating unit configured to calculate a pitch value using the reference pitch value and the compensation pitch value, wherein the error value is any one of a voltage error value from a direct-current capacitor included in a power converter unit of the wind power generation system, a voltage error value from a grid connection point of the wind power generation system, a speed error value from a rotor of the wind power generation system, and a frequency error value from a grid connection point of the wind power generation system.