Frequency Sweep Method for Measuring Modal Frequency of Generating Set Shafting System

A modal frequency, generator set technology, applied in the measurement of resonant frequency, measurement device, measurement of ultrasonic/sonic/infrasonic waves, etc., can solve the problems that the test cannot be guaranteed to be fully effective, and the operation of the generator set and the power grid is destructive. Synchronous oscillation problem, significant economic benefits, and the effect of strong operability

Active Publication Date: 2012-02-15
CHINA SHENHUA ENERGY CO LTD +6
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disadvantage of this test method is that it cannot guarantee that the test is fully effective every time, and it is destructive to the operation of the unit and the power grid.

Method used

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  • Frequency Sweep Method for Measuring Modal Frequency of Generating Set Shafting System
  • Frequency Sweep Method for Measuring Modal Frequency of Generating Set Shafting System
  • Frequency Sweep Method for Measuring Modal Frequency of Generating Set Shafting System

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Embodiment Construction

[0021] figure 1 It is an experimental system according to an embodiment of the present invention, and the system includes a generator set 101, a power grid 102, a subsynchronous oscillation suppression device (SSR-DS) 103, a rotational speed measurement and analysis system 104, a series compensation circuit 105, and a signal generator 106 . The function of the subsynchronous oscillation suppression device is to process the single-mode excitation signal added by the signal generator and send reactive power to the grid, and finally stimulate the subsynchronous oscillation single-mode signal of the shafting of the generator set with the added frequency. The subsynchronous oscillation suppression device (SSR-DS) 103 is installed at the starting point of the power grid of the power plant, and the series compensation line 104 is in the middle of the entire grid 102 .

[0022] According to a specific embodiment of the present invention, a frequency sweeping method for measuring the ...

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Abstract

The frequency sweeping method for measuring the modal frequency of the shaft system of the generator set disclosed by the present invention includes: a. obtaining multiple modal frequencies of the subsynchronous oscillation of the simulated generator set; b. using a signal generator at the input end of the subsynchronous oscillation suppression device Input a modal frequency as the excitation signal; c. Change the input amplitude of the excitation signal until the excited generator speed change modal data stabilizes at the predetermined modal signal amplitude; d. Record the excitation signal at the modal frequency and the detected generator speed change modal data; e. scan within the predetermined range of the modal frequency with a predetermined step size, repeating step b, step c and step d; f. according to the recorded generator speed change Modal data to determine the subsynchronous oscillation single mode frequency value of the generator set. Compared with the existing test means, the present invention can accurately determine the modal frequencies of multiple generating sets without using other special equipment.

Description

technical field [0001] The invention relates to a frequency sweeping method for measuring the modal frequency of a shaft system of a generating set. Background technique [0002] The large-scale thermal steam turbine unit is one of the key equipment of my country's power system. The shafting of the high-power unit has the characteristics of light weight and flexibility, multiple supports, large span, and high power density. The natural frequency spectrum of the shafting system is relatively dense, and the vibration induced The energy is low; at the same time, the power grid is also developing in the direction of ultra-high voltage and long-distance. The potential factors are increasing day by day, which makes the torsional vibration problem of generator set shafting more and more serious. The torsional vibration of the shafting of the motor set will also stimulate the oscillation of the power grid, causing line tripping or unit decoupling, which directly affects the stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H13/00
Inventor 张银山林惊涛安万洙卓华顾强王绍德武云生李海生王飞义尤建生李鹏李旷侯小平丁雅丽肖述林司明起
Owner CHINA SHENHUA ENERGY CO LTD
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