Non-stationary signal state monitoring method and system for nuclear power equipment

Abstract

The invention relates to a non-stationary signal state monitoring method and system for nuclear power equipment. The monitoring method comprises the following steps: acquiring a characteristic signalof each measuring point of the nuclear power equipment in normal operation; carrying out variational mode decomposition on each characteristic signal, and construcitng a constrained variational model;introducing a penalty parameter and a penalty factor, and determining an optimal solution of the constrained variational model; determining modal components according to the optimal solution, screening the modal components, and determining an intrinsic modal function; performing feature extraction on the time sequence by adopting multi-scale weighted permutation entropy, and determining real-timeweighted permutation entropies under different scales; determining a weighted permutation entropy statistical threshold of each weighted permutation entropy under different scales according to the real-time weighted permutation entropies under different scales; and comparing the real-time weighted permutation entropies under different scales with the weighted permutation entropy statistical threshold, and determining the non-stationary signal state of the nuclear power equipment. The detection precision can be improved.

Description

technical field [0001] The invention relates to the field of non-stationary signal state monitoring of nuclear power equipment, in particular to a non-stationary signal state monitoring method and system of nuclear power equipment. Background technique [0002] Nuclear power plants are complex in structure and have radioactive hazards, which have extremely high requirements for safety. At the same time, the nuclear power system works continuously for a long time, and it is extremely prone to failure. If the equipment fails to detect and find out in time, it may cause serious radioactive release consequences, endangering public safety and environmental conditions. At present, most of the anomaly detection technologies for nuclear power systems and key equipment use traditional threshold analysis and human experience to judge. However, these traditional technologies cannot fully adapt to the reliability requirements of complex systems and key equipment. With the continuous de...

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Problems solved by technology

[0015] The purpose of the present invention is to provide a non-stationary signal state monitoring method and system for nuclear power equipment, so as to solve the non-stationary characteristics and traditional time-domain characteristics of collecting characteristic parameters on key equipment in the existing non-stationary signal state monitoring method When using and frequency domain features, there is a problem of insufficient feature extraction, which leads to the inability to quickly detect the early small abnormalities of non-stationary and nonlinear signal states, and the problem of low detection accuracy

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