A Method for Reducing Low Frequency Vibration of Generator Stator Based on Air Gap Eigenvalue
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, improve rotor roundness and eccentricity, and improve work efficiency. , Low frequency vibration reduction effect
Active Publication Date: 2021-05-07
HUANENG LANCANG RIVER HYDROPOWER
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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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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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The invention provides a method for reducing the low-frequency vibration of the generator stator based on the characteristic value of the air gap. Generator air gap function value, according to the air gap eigenvalue calculation formula, calculate each order component of the air gap eigenvalue, read the actual amplitude of the stator low frequency vibration, and calculate the amplitude of the calculated generator air gap eigenvalue respectively Carry out substitution correction, take the magnetic pole number n as the abscissa, and the corrected generator air gap eigenvalue as the ordinate, draw a schematic diagram of the generator air gap eigenvalue, and obtain a larger generator air gap eigenvalue, for the air gap function By adjusting and verifying, and determining the magnetic poles that need to be adjusted, the low-frequency vibration of the generator stator can be effectively reduced, and the work 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...
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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