S-shaped feeding and withdrawing control method of locking device for servomotor of hydroelectric generating set

Abstract

The invention provides an S-shaped feeding and withdrawing control method of a locking device for a servomotor of a hydroelectric generating set. The locking device comprises a locking servomotor, a displacement sensor positioned at the rear part of a locking bar, and hydraulic control valves connected with a feeding cavity and a withdrawing cavity separately; when the locking bar of the locking servomotor is fed or withdrawn, the locking bar does accelerated movement slowly at the start point position, rapidly moves at the middle position, and does decelerated movement when being close to thefinal point position; and the curve between the displacement of the locking bar and the time is S-shaped. Through the adoption of the S-shaped feeding and withdrawing control method, the problem thatthe impact force is too large when guide vanes of an original hydroelectric generating set are controlled to be locked is solved, the structure is simple, the curve between the displacement of the locking device and the time is S-shaped, the fact that the locking device has high buffer performance in the start point position or the final point position of feeding and withdrawing control is realized, realizes fast feeding and withdrawing control, and avoids mistaken change of the position of the locking device caused when a controller is powered on.

Description

technical field [0001] The invention belongs to the technical field of throwing and withdrawing control of guide vanes of a hydroelectric unit, and relates to an S-shaped throwing and withdrawing control method of a servomotor locking device of a hydroelectric unit. Background technique [0002] The guide vane servomotors of hydro-generator sets are all equipped with locking devices. After the unit is shut down and the guide vanes are fully closed, the device needs to be put into use to prevent the guide vanes from opening due to misoperation of the servomotor, thus ensuring the safety of hydropower plant equipment and personnel. safety; before the governor is turned on, the locking device needs to be pulled out so that the guide vanes can be opened smoothly. [0003] For the locked throwing and withdrawing control and position detection, the traditional control method adopts pure open-loop control. This method uses a two-position four-way reversing solenoid valve to contro...

AI Technical Summary

Problems solved by technology

However, the closed-loop locking control method still has a large impact at the starting point, and the time spent in the process of switching on and off is more than 6 times that of the open-loop mode, which will cause the single-step process of starting and stopping to time out, resulting in failure of automatic starting and stopping

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