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Reactor neutron noise spectrum calculation method based on improved wavelet algorithm

A noise spectrum and wavelet algorithm technology, applied in computing, computer parts, computer-aided design, etc., can solve the problems of unable to capture the local characteristics of the spectrum, unable to perform multi-resolution analysis in Fourier analysis, etc., to improve the analysis ability and analysis accuracy. , the effect of fine division and local feature extraction

Active Publication Date: 2017-09-22
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

[0007] 4) The signal in the project contains both high-frequency information and low-frequency information, which requires that the time interval for high-frequency information should be relatively small to give accurate high-frequency information, and the time interval for low-frequency information should be relatively widened to give a Complete information within the period, Fourier analysis cannot perform multi-resolution analysis;
[0012] The purpose of the present invention is to solve the problem that the existing reactor neutron noise spectrum analysis method can only obtain the macroscopic characteristics of the noise spectrum, but cannot capture the local characteristics of the spectrum

Method used

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  • Reactor neutron noise spectrum calculation method based on improved wavelet algorithm
  • Reactor neutron noise spectrum calculation method based on improved wavelet algorithm
  • Reactor neutron noise spectrum calculation method based on improved wavelet algorithm

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Embodiment Construction

[0028] Prepare the data files of the two-channel signals of the reactor noise, and set the sampling frequency to more than twice the upper limit of the frequency domain to be analyzed according to the Nyquist criterion.

[0029] Step 1. Based on the data file, perform wavelet node discretization on the reactor neutron noise channel signal:

[0030] The flow of the wavelet decomposition algorithm is as follows: figure 2 Shown:

[0031] Among them, the mathematical expression of operator OL is:

[0032]

[0033] S(k)=0(N / 4

[0034]

[0035] Among them, W=e -j2π / N , N represents the data length on the current analysis scale, and s(n) is the output of the operator OL.

[0036] The mathematical expression of the operator OH is:

[0037]

[0038] S(k)=0(0≤k

[0039]

[0040] Among them, W=e -j2π / N , N represents the data length on the current analysis scale, and S(n) is the output of operator OH.

[0041] Let node [0,0] be x j-1 , node [...

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Abstract

The invention discloses a reactor neutron noise spectrum calculation method based on an improved wavelet algorithm. Wavelet node dispersion is performed on a reactor neutron noise channel signal, frequency aliasing during a node acquisition process is eliminated, then the signal of a wavelet disperse node is rebuilt to acquire a reactor noise channel sub-frequency band signal, and at least spectrum calculation is sequentially performed on each sub-frequency band signal of a reactor noise channel to acquire frequency band spectrum information. According to the reactor neutron noise spectrum calculation method based on the improved wavelet algorithm provided by the invention, fine division of each frequency band and local feature extraction of a reactor neutron noise spectrum can be better reflected, analysis capacity and analysis accuracy are greatly improved, an input condition is provided for operation monitoring and fault diagnosis of a reactor, and a significant improvement significance is provided for safe operation of the reactor and building of an expert system.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor monitoring and fault diagnosis, and in particular relates to a reactor neutron noise spectrum calculation method based on an improved wavelet algorithm. Background technique [0002] Reactor noise analysis began with the study of the physical properties of the core and gradually developed into other areas of reactor engineering. Especially after nearly 30 years of research and development, it has become a powerful tool for auxiliary monitoring of the operating conditions of power reactors, especially pressurized water reactors, and has been included in design specifications and relevant safety regulations. PWR nuclear power plants, such as Tianwan Nuclear Power Plant and AP1000, are equipped with noise analysis and diagnosis systems with different functions. [0003] The first-generation reactor noise analysis method based on Fourier analysis can obtain the basic spectral characteristics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06K9/00G06F17/14
CPCG06F17/142G06F2119/10G06F30/20G06F2218/06
Inventor 袁宝新曾和荣杨万奎
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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