Judgment method and system for running state of coupling of wind generating set

The invention discloses a method and a system for judging the running state of a coupling of a wind generating set. The method comprises the steps of: collecting the real-time rotating speed of a wind wheel, and establishing a wind wheel rotating speed database; acquiring the real-time rotating speed of a generator, and establishing a generator rotating speed database; averaging the collected wind wheel rotating speed and the collected generator rotating speed respectively; calculating the rotation speed of the input end of the coupler=wind wheel rotating speed*gearbox speed ratio; and comparing the rotating speed of the generator with the rotating speed of the input end of the coupler, comparing the absolute value R of the difference between the two rotating speeds with a set threshold value T, and judging the running state of the coupler according to the comparison result. The system comprises a gearbox encoder, a generator encoder, a control module, a calculation module and a judgment module. On the basis