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Xenon evolution prediction method and system based on dynamic mode decomposition

A dynamic model and prediction method technology, applied in complex mathematical operations, design optimization/simulation, special data processing applications, etc., can solve problems such as boundary conditions and initial conditions that are difficult to obtain

Pending Publication Date: 2021-09-14
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, the prediction of xenon oscillation is directly simulated by using reactor physics calculation software, but this method requires accurate boundary conditions and initial conditions, and in the actual operation process, due to the different operating history of the reactor power Deterministic, accurate boundary conditions and initial conditions are difficult to obtain; in addition, by establishing a parametric ellipse diagram of xenon and iodine distribution, the tracking and prediction of axial power offset (AO) is realized, but the modeling process is slightly complicated; The problem of low precision

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  • Xenon evolution prediction method and system based on dynamic mode decomposition
  • Xenon evolution prediction method and system based on dynamic mode decomposition
  • Xenon evolution prediction method and system based on dynamic mode decomposition

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Embodiment 1

[0061] Such as Figure 1 to Figure 5 Shown, the present invention is a kind of xenon evolution prediction method based on dynamic mode decomposition, such as figure 1 As shown, the method includes:

[0062] S1: Obtain the set of N detector points in the reactor core D={r 1 , r 2 ,...,r N}, and the corresponding measured power value P at time t t =(P 1 , t , P 2 ,t,...,P N，t ) T ;

[0063] S2: Take δt as the fixed sampling interval, and collect the measured values ​​of the detectors at the first M moments to form the first matrix X 1 , the second matrix X 2 ; Wherein, the first matrix X 1 as the current time t 0 Subtracting the matrix formed by the measured values ​​of the detectors at the fixed sampling interval δt pushed forward by M moments, the second matrix X 2 as the current time t 0 Push forward the matrix composed of the measured values ​​of the detectors at M moments; where:

[0064]

[0065] and

[0066]

[0067] S3: According to the obtained fi...

Embodiment 2

[0086] Such as Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a xenon evolution prediction system based on dynamic mode decomposition, which supports the xenon evolution prediction system based on dynamic mode decomposition described in Embodiment 1 method, the system includes:

[0087] The acquisition unit is used to acquire a set of several detector points in the reactor core and a corresponding measured power value at time t;

[0088] The first and second matrix forming units are used to form the first matrix and the second matrix by collecting the measured values ​​of the detectors at the first M moments at a fixed sampling interval; wherein, the first matrix is ​​the current moment minus the fixed sampling A matrix formed by the measured values ​​of the detectors pushed forward by M times at an interval, and the second matrix is ​​a matrix formed by the measured values ​​of the detectors pushed forward by M time...

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Abstract

The invention discloses a xenon evolution prediction method and system based on dynamic mode decomposition, and the method comprises the steps: S1, obtaining a plurality of detector point sets of a reactor core, and a corresponding t moment actually measured power value; S2, collecting the measured values of the detector at the first M moments at a fixed sampling interval to form a first matrix and a second matrix; S3, assembling an r*r-dimensional assembly matrix according to the first matrix and the second matrix, and performing eigenvalue decomposition on the assembly matrix to obtain an eigenvalue matrix and an eigenvalue coefficient; S4, constructing an r-order dynamic mode of xenon evolution; and S5, according to the r-order dynamic mode of xenon evolution, adopting a xenon evolution prediction model to predict xenon evolution after the current moment. The method is used for predicting the detector signal or the actually measured power of the detector in the reactor in the xenon transient state; and according to the method, the precision and efficiency of xenon transient prediction are remarkably improved, the reactor operation support capability is enhanced, and the reactor operation safety is improved.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor operation support, in particular to a method and system for predicting xenon evolution based on dynamic mode decomposition, which can expand the functions of the reactor online monitoring system and improve the prediction ability of the online monitoring system. Background technique [0002] In the operation of the reactor, due to the large absorption cross section of xenon, the concentration of xenon has a great influence on the fission reaction rate, and the power transient of a large reactor is usually accompanied by xenon oscillation. Taking appropriate measures to accurately monitor and predict xenon oscillations to ensure that correct control measures are taken is conducive to monitoring the operational safety of the reactor. [0003] Usually, the prediction of xenon oscillations is directly simulated by using reactor physics calculation software, but this method requires accurate bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/16
CPCG06F30/20G06F17/16
Inventor 龚禾林李庆于颖锐陈长钟旻霄
Owner NUCLEAR POWER INSTITUTE OF CHINA
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