Rotating speed control method and device of wind generation set

The invention discloses a rotating speed control method and device of a wind generation set. The rotating speed control method of the wind generation set comprises the following steps of: obtaining a current working condition of the wind generation set; judging whether the current working condition of the wind generation set is a normal working condition or not; and when the current working condition of the wind generation set is in an improper working condition, controlling a rotating speed of a rotor of the wind generation set to stabilize the rotating speed of the wind generation set. According to the invention, a corresponding control policy is formulated aiming at the problem which is possibly caused by the wind generation set under the improper working condition, so that under the improper working condition, the rotating speed of the rotor is adjusted by executing the pre-formulated control policy aiming at the working condition, namely the rotating speed of the wind generation set can be better stabilized; and therefore, the set can be safely operated for a long period of time under the improper working conditions including voltage fluctuation of a power grid and the like.