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

Abstract

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 that a traditional slip detection scheme is not changed, by optimizing a rotating speed data processing scheme, measurement errors are eliminated, the running state of the coupler can be accurately judged, and the coupler is prevented from being damaged due to continuous slip.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and system for judging the running state of a coupling of a wind power generating set. Background technique [0002] The wind turbine coupling (hereinafter referred to as "coupling") is an important transmission part connecting the gearbox and the generator in the wind turbine. The main task of the coupling is to transmit the torque of the gearbox, to compensate the parallel deviation and angle error between the gearbox and the generator, and to have certain stiffness and damping to reduce vibration transmission. In addition, when the wind turbine is impacted by an external sudden load and exceeds the design slipping torque of the coupling, the coupling has a slipping protection function to prevent accidental damage to the speed increaser and generator on the transmission chain due to overload. [0003] Although the current technical solution can judge whe...

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Problems solved by technology

[0003] Although the current technical solution can judge whether the coupling has slipped, there are two problems. One is the technical defect that the slip angle cannot be quantified; low, but the generator speed is high, and the resolution of the speed measuring device is high. The resolution of the two is different, resulting in a large error when the speed is directly compared. In order to prevent misjudgment, the speed difference for judging whether the coupling is slipping The threshold will be set relatively large. When the speed difference of the wind turbine reaches the set threshold and an alarm is issued, the coupling has generally been damaged due to continuous slipping. It is impossible to accurately judge whether the coupling has slipped through the speed difference, let alone Accurate judgment and early warning of early skidding

[0004] The patents "wind turbine coupling slip warning device, wind generator and early warning method (CN201910517091.9)" and "wind turbine coupling slipping fault detection device and method (CN201510913824.2)" are obtained through the coupling Add speed gears at both ends of the coupling, and then measure and compare the two speed gears and speed angles. Although this method can accurately determine whether the coupling is slipping, it needs to modify the existing coupling to increase the speed at both ends. The toothed disc increases the cost of the coupling, is laborious and laborious, and is not operable

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