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A method for reducing low-frequency vibration of a generator stator based on air gap characteristic values

A low-frequency vibration and eigenvalue technology, which is applied to the control of generators, the control of generators through magnetic field changes, and the protection of power generation through control, can solve problems such as stator low-frequency vibrations, reduce low-frequency vibrations of stators, and improve rotor roundness and eccentricity. Degree, the effect of improving work efficiency

Active Publication Date: 2019-12-31
HUANENG LANCANG RIVER HYDROPOWER
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Problems solved by technology

According to the characteristic that the characteristic value of the air gap is associated with the low-frequency vibration of the stator when the generator is running, the present invention provides a method for reducing the low-frequency vibration of the stator of the generator based on the characteristic value of the air gap, and finally solves the problem of low-frequency vibration of the stator

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  • A method for reducing low-frequency vibration of a generator stator based on air gap characteristic values
  • A method for reducing low-frequency vibration of a generator stator based on air gap characteristic values
  • A method for reducing low-frequency vibration of a generator stator based on air gap characteristic values

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Embodiment 1

[0030] A hydroelectric generator with a capacity of 650MW, a rated speed of 125r / min, and a total of 48 magnetic poles. After the overhaul, the boost test of the generator was carried out. When the excitation current rose to the maximum, the horizontal vibration of the stator frame was 113 μm, and the vibration index did not meet the requirements. In order to reduce the low-frequency vibration of the stator, the following specific steps were taken:

[0031] (1) From the online TN8000STA monitoring system, collect the stator low-frequency vibration amplitude and spectrum data under the condition of no-load and rated excitation current, such as figure 1 :

[0032] (2) From the online TN8000AGMS monitoring system, collect the generator air gap function value x(n), the unit is: mm, the collection time points are consistent with the collection time points of the stator low-frequency vibration amplitude and spectrum data, and according to the power generation For the rotation direc...

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Abstract

The invention provides a method for reducing low-frequency vibration of a generator stator based on air gap characteristic values. The method comprises the following steps: collecting stator low-frequency vibration amplitude, frequency spectrum data and generator dynamic air gap function values; numbering magnetic poles according to the rotating direction of a generator set; collecting generator air gap function values, and calculating each order component of the air gap characteristic value according to an air gap characteristic value calculation formula; reading actual amplitude of the low-frequency vibration of the stator; carrying out substitution correction on the amplitude in the calculated generator air gap characteristic values; with the magnetic pole number n being as a horizontalcoordinate and the corrected generator air gap characteristic values being as a vertical coordinate, drawing a generator air gap characteristic value schematic diagram, and obtaining a larger generator air gap characteristic value; and adjusting and verifying the air gap function and determining magnetic poles needing generator pit adjustment. Therefore, the low-frequency vibration of the generator stator can be effectively reduced, and the working efficiency is greatly improved.

Description

technical field [0001] The invention relates to a method for reducing low-frequency vibration of a generator stator, in particular to a method for reducing low-frequency vibration of a generator stator based on an air gap characteristic value, and belongs to the technical field of installation, operation and maintenance of hydraulic generators. Background technique [0002] In recent years, with the commissioning of domestic giant hydroelectric generating units, it was found through tests during the operation that there are low-frequency vibration problems in the stator frame and iron core of the hydroelectric generating units. It is generally considered qualitatively that low-frequency vibration is caused by insufficient roundness or eccentricity of the stator and rotor, but how to take effective measures to control it, there is no quantitative technical solution in the prior art. At present, the main measures to deal with the low-frequency vibration of the stator are: lift...

Claims

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Application Information

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IPC IPC(8): H02K15/02H02P9/00H02P9/14
CPCH02K15/02H02P9/006H02P9/14
Inventor 杨光勇邹锐岳建锋叶超朱晓韬徐文冰曲岩罗志明周天华陈明蔡朝东钟新元赵海峰杨治全杨冬
Owner HUANENG LANCANG RIVER HYDROPOWER
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