Method and system for controlling end portion vibration of generator winding

A winding end, vibration control technology, applied in mechanical oscillation control, non-electric variable control, control/regulation systems, etc., can solve the problems of large construction workload and high cost, and achieve simple operation and reduce vibration amplitude. Effect

CN108181944AInactive Publication Date: 2018-06-19GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-06-19
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0040] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] The inventors of the present application found that when a large-scale generator is running, a certain vibration is often generated at the end of the stator winding of the generator. When the vibration frequency is close to the natural frequency of the winding end, resonance is easy to occur, so that Vibration intensifies, causing ...