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Method for solving modal damping of shaft system of 1,000MW steam turbo generator set

A technology for turbogenerators and generators, applied to vibration measurement in solids, measuring vibrations, measuring devices, etc., can solve problems such as system instability

Active Publication Date: 2011-09-07
BEIJING SIFANG JIBAO AUTOMATION +2
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Problems solved by technology

And when the modal damping is less than 0, its function is positive feedback, which will inevitably lead to the instability of the system

Method used

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  • Method for solving modal damping of shaft system of 1,000MW steam turbo generator set
  • Method for solving modal damping of shaft system of 1,000MW steam turbo generator set
  • Method for solving modal damping of shaft system of 1,000MW steam turbo generator set

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Embodiment Construction

[0023] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] For a specific power transmission system with SSR / SSO risks, the method for identifying the subsynchronous torsional vibration modal frequency and damping of the unit shafting system based on the excitation injection excitation torsional vibration test designed by the present invention will be designed and implemented according to the following steps.

[0025] Step 1: Excitation injection excitation torsional vibration test

[0026] Such as figure 1 Shown is the equipment wiring diagram using the excitation injection excitation torsional vibration test method in the method of the present invention.

[0027] Field test equipment for excitation injection excitation torsional vibration test includes:

[0028] 1), excitation signal generating device;

[0029] 2), Shaft speed sensor (head / tail installation);

[0030] 3), signal...

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Abstract

The invention discloses a method for solving the modal damping of a shaft system of a 1,000MW large steam turbo generator set based on an excitation injection stimulated torsional oscillation test. The method comprises the following steps of: exciting a special modal torsional oscillation signal domega from the shaft system by applying a precise modal frequency pumping signal; performing frequency spectrum analysis on the domega and performing time domain analysis on amplitude to acquire precise modal frequency; analyzing variation trend data of the excited domega signal amplitude in a time domain; performing logarithm least square fitting on the variation trend data of the domega signal amplitude in the time domain to solve a total damping level D under the test condition; setting up a systemic nonlinear simulation model by taking PSCAD as a platform; setting mechanical damping as 0 and recognizing the damping of a corresponding work condition, namely electrical damping De; and calculating the mechanical damping of the corresponding work condition, namely Dm=D-De. The method can be used for recognizing the damping level condition of the 1,000MW steam turbo generator set under various work conditions, particularly the mechanical damping of the set.

Description

technical field [0001] The invention belongs to the technical field of electric power system stability and control, and specifically relates to a method for obtaining the modal damping value of the subsynchronous oscillation of the shaft system of a large turbogenerator set by using an excitation injection excitation torsional vibration test, which is used for system stability judgment Provide evidence. Background technique [0002] With the increasing demand for long-distance large-capacity transmission, especially large-scale coal power bases are far away from the load center, most of them adopt the long-distance plant-to-grid transmission mode. In order to improve the transmission capacity and system stability, more and more fixed series capacitors are used. Compensation (FSC), high-voltage direct current transmission (HVDC) and some high-speed control devices based on power electronics technology. However, these devices may induce subsynchronous resonance (SSR) or oscil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H1/10
Inventor 谢小荣杨晓东孙术文孔令宇焦邵华刘全常富杰郑巍张晓晋
Owner BEIJING SIFANG JIBAO AUTOMATION
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