Patent ID: 8299642

Claim:
A wind power generation system that supplies a generated power to a power system from an AC excitation generator, comprising: a stator of the AC excitation generator connected with the power system; an AC excitation converter connected with a rotor of the AC excitation generator, the rotor of the AC excitation generator connected with a turbine to rotate the rotor of the AC excitation generator by a motive energy of the turbine; a shunt circuit unit, shuntable by a switching unit, provided between the AC excitation converter and the rotor of the AC excitation generator; a system-sided converter connected between the stator of the AC excitation generator and the power system, a DC portion of the system-sided converter connected with a DC portion of the AC excitation converter; and a converter controller provided for controlling an excitation converter and the system-sided converter backed up at when a system voltage is descended, wherein the converter controller includes a unit that detects a DC voltage, a DC voltage ascent detection unit and a unit that operates the shunt circuit unit when the DC voltage ascent detection unit detects the DC voltage ascent.