Patent ID: 8093740
Filing Date: 2012-01-10
Classification: F03D,F05B,Y02E

Abstract:
1. A method for controlling a wind power generation system comprising: a rotor having blades coupled mechanically thereto, the pitch of the blades being variable; a synchronous generator driven by the rotor; a generator-side converter connected electrically with the synchronous generator, for converting the power of variable frequency generated by the synchronous generator to DC power; and a grid-side converter connected electrically with the generator-side converter and a power grid, for converting the DC power to AC power having a fixed frequency, wherein when a voltage of the power grid, a current of the power grid or a frequency of the power grid is abnormal, the rotational speed of the rotor is controlled to be in a fixed range by varying the blade pitch, and the generator-side converter controls the reactive power supplied to the synchronous generator, wherein when the detected value of the current in the wind power generation system proves to be abnormal, the amount of current drawn from the synchronous generator is controlled to be smaller than the current capacity of the generator-side converter by controlling the reactive power supplied to the synchronous generator by means of the generator-side converter.