Method and system for controlling end portion vibration of generator winding

Abstract

The invention discloses a method and system for controlling end portion vibration of a generator winding. The method comprises: a vibration amplitude of the end portion of a generator winding is monitored in real time; the vibration amplitude is compared with a preset vibration amplitude; if the vibration amplitude is larger than the preset vibration amplitude, adjustment of the temperatures of cooling water and hydrogen is triggered; the temperatures of cooling water and hydrogen are adjusted to change the inherent frequency of the end portion of the generator winding; and when the vibrationamplitude of the end portion of the generator winding is monitored to be reduced to be below a target vibration amplitude and the value is stable, adjustment is completed. According to the invention,on the basis of a relationship between a generator temperature field and a modal frequency of the winding end structure, the temperature field inside the generator is changed based on the temperaturesof cooling water and hydrogen, so that the material structural force and elasticity modulus of the end portion of the generator winding are changed and thus the inherent frequency of the end portionof the generator stator winding is changed. Therefore, the excitation force frequency is avoided and the vibration amplitude is reduced.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a method and system for controlling vibration at the end of a generator winding. Background technique [0002] A large generator is a very complex system, usually consisting of rotating parts and stationary fixed parts. The winding end is an important part of the static and fixed parts, and its working condition is very important to ensure the safe and stable operation of the unit. The end of the winding is suspended outside the stator core, and its own rigidity is very low, and it is easy to cause vibration exceeding the standard under the action of electromagnetic force. Damaged winding insulation, blown lead wires at the end of the stator, and loose fasteners caused by excessive vibration at the end of the generator are not uncommon in large thermal power plants. Therefore, it is of great significance to analyze the vibration state of the generator winding end, and to car...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a vibration control method and system at the end of a generator winding, which solves the technical problems that a large number of reinforcing ribs need to be arranged in the current rigidity strengthening method used to control the vibration of the generator end, and the on-site construction workload is large and the cost is high.

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