A method for off-line filtering of reactive meter current
A reactive instrument and reactive technology, applied in the field of reactive pre-judgment filtering method, can solve the problems of fluctuation, current signal noise, inability to distinguish, etc., and achieve the effect of reducing the impact
Active Publication Date: 2018-05-22
CHINA INSTITUTE OF ATOMIC ENERGY
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[0003] Due to the inevitable electrical noise in the detector system, there are statistical fluctuations in the number of neutrons entering the extra-core detector, which makes the current signal detected by the reactivity instrument have obvious noise
like figure 1 As shown, the current signal measured on the zero power device is between 0 and 5×10 -12 If A changes, the reactivity calculated by it will fluctuate more; figure 2 As shown, according to the inverse dynamic equation by figure 1 The reactivity calculated for the currents shown in shows large fluctuations and in some positions it cannot even be resolved
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[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0029] The main principle of the off-line filtering method developed by the present invention is "centered evaluation, forward fitting, and backward verification", and then use the reactive pre-calculated results to return to judge the true or false of the current value, and perform weighted filtering processing on it.
[0030] "Centered evaluation" is used to eliminate abnormal points, that is, to directly eliminate data points that are obviously far from the normal trend; since the judgment of "abnormal" requires the use of data on both sides of the point, the evaluation of this point is through the two sides The data judges the centered data, so it is called "centered evaluation". The specific implementation algorithm is as follows:
[0031] 2-point mean, criterion: |x i -x p |>3max{|x 1 -x p |,|x 2 -x p |};
[0032] 4-point mean, criterion...
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The invention relates to an off-line filtering method of a reactivity meter current. The offline filtering method developed by the present invention includes three steps of centering evaluation, forward fitting, and backward checking, and then uses the reactive pre-calculated results to return to judge the true or false of the current value and perform weighted filtering processing on it. According to the characteristics of the current signal of the reactivity meter system and the calculation requirements of the inverse dynamic equation, the present invention has developed a set of filtering algorithm and process, which greatly reduces the influence of noise on the calculation and measurement of reactivity, and is a great tool for dynamic marking of rods under low current. , Reactive supervision provides assistance.
Description
technical field [0001] The invention specifically relates to a reactivity instrument current off-line filtering method, which belongs to the reactivity prediction filtering method. Background technique [0002] The monitoring and measurement of reactor power and reactivity rely on the external detector, which converts the neutrons entering the detector into current signals, so as to calculate the power and reactivity of the core. [0003] Due to the inevitable electrical noise in the detector system, the number of neutrons entering the extra-core detector has statistical fluctuations, which makes the current signal detected by the reactivity instrument have obvious noise. Such as figure 1 As shown, the current signal measured on the zero power device is between 0 and 5×10 -12 If A changes, the reactivity calculated by it will fluctuate more; figure 2 As shown, according to the inverse dynamic equation by figure 1 The reactivity calculated for the current shown in , fluc...
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IPC IPC(8): G06F19/00
Inventor 霍兴凯范振东廖泽军陈晓亮叶国栋潘泽飞胡赟徐李代前进李文涛
Owner CHINA INSTITUTE OF ATOMIC ENERGY