Patent ID: 8887868

Claim:
A starting method of a wind turbine generator which includes a main shaft connected to a wind turbine rotor, a main bearing rotatably supporting said main shaft and a main bearing lubricant pump circulating lubricant through said main bearing, said method comprising: rotating said main shaft and raising a temperature of said main bearing in a state in which said main bearing lubricant pump is not operated, wherein a rotational velocity of said main shaft is controlled in a state in which a generator connected to said main shaft is placed into a no-load state in the raising of the temperature of said main bearing; and operating said main bearing lubricant pump to start supplying the lubricant to said main bearing after the raising of the temperature of said main bearing, wherein the no-load state is a state in which a generator torque of the generator is zero and a rotor of the generator remains connected to the main shaft.