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An identification method for torsional vibration modal parameters of generator set shafting under environmental excitation

A technology for torsional vibration of generator sets and shafting, which is applied in the fields of electrical digital data processing, measurement vibration, and special data processing applications, and can solve the problems of lack of real-time monitoring methods

Active Publication Date: 2017-05-17
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

As an important parameter in SSR / SSO research, modal damping is mostly obtained by off-line analysis or artificial small disturbance test, lacking real-time monitoring means

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  • An identification method for torsional vibration modal parameters of generator set shafting under environmental excitation
  • An identification method for torsional vibration modal parameters of generator set shafting under environmental excitation
  • An identification method for torsional vibration modal parameters of generator set shafting under environmental excitation

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Embodiment Construction

[0043] The purpose of the present invention is to provide a method based on free response extraction and feature model establishment to identify the torsional vibration modal parameters of the generator set under environmental excitation, especially the damping, to provide features for real-time monitoring of dynamic oscillation during the operation of the power system Extraction methods and reliable basis. The technical solution of the present invention will be further described in detail below in conjunction with the drawings and embodiments of the description.

[0044] The concrete realization technical scheme of the present invention is as attached figure 1 As shown, a method for identifying the modal parameters of the shafting torsional vibration of a generator set under environmental excitation includes the following steps:

[0045] Step 1: Torsional vibration signal acquisition

[0046] Such as Figure 5 As shown, the sensor of a domestic power plant is installed on ...

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Abstract

A method of identification of torsional modal parameters of generator shafts under ambient excitation, comprising: (1) a speed deviation signal dɷ being obtained by sampling and demodulating rotation speed pulse signal; (2) obtaining mode signals dɷ, of each order by filtering the speed deviation signal dɷ; (3) taking each mode signal dɷ; as input, a corresponding free vibration response RD, is obtained by shift and superposition of sub-samples selected with a predefined initial condition; (4) modal frequency and damping ratio are based on a character matrix and a shafts torsional vibration equation; (5) based on each mode signal dɷ,, a real-time damping character of torsional modes for generator shafts is given by moving a time window and repeating steps (3)-(4). The invention can be used to identify torsional modes not only for the cases of large / small perturbations but also for the cases of ambient excitation. It has an advantage of real-time monitoring dynamic oscillation in a power system.

Description

technical field [0001] The invention belongs to the technical field of power system stability and control, and specifically relates to a calculation method for identifying torsional vibration modal parameters of a shaft system of a generator set by using the rotor vibration response of a generator set under environmental excitation, so as to provide a basis for judging the stability of the power system. [0002] technical background [0003] With the increasing demand for long-distance and large-capacity power transmission, new technologies such as series compensated power transmission, DC power transmission, and FACTS are increasingly adopted by power systems. However, while these new technologies bring huge economic and social benefits to the operation of the power system, they also bring many problems to the safe and stable operation of the system, such as the resulting subsynchronous resonance SSR or subsynchronous oscillation SSO problems will affect the power grid and G...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCG01H1/006G01H1/10
Inventor 焦邵华白淑华李元盛常富杰郑巍梁新艳张涛刘全
Owner BEIJING SIFANG JIBAO AUTOMATION
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