A 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 includes: acquiring characteristic signals of each measuring point of nuclear power equipment under normal operation; performing variational modal decomposition on each of the characteristic signals to construct a constrained variational model; introducing penalty parameters and penalty factors, Determine the optimal solution of the constrained variational model; determine modal components according to the optimal solution, screen the modal components, and determine the eigenmode function; adopt multi-scale weighted permutation entropy to Perform feature extraction on the time series to determine the real-time weighted permutation entropy at different scales; determine the weighted permutation entropy statistical threshold of each weighted permutation entropy under different scales according to the real-time weighted permutation entropy at different scales; The real-time weighted permutation entropy and the statistical threshold of the weighted permutation entropy determine the non-stationary signal state of the nuclear power plant. The present invention can improve the detection precision.

Description

technical field [0001] The invention relates to the field of non-stationary signal state monitoring of nuclear power equipment, in particular to a method and system for non-stationary signal state monitoring 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 is very prone to failure. If the equipment fails to be detected and discovered in time, it may lead to serious radioactive release consequences, endangering public safety and environmental conditions. At present, most of the abnormal detection technologies for nuclear power systems and key equipment use traditional threshold analysis and artificial experience to judge. However, these traditional technologies cannot fully meet the reliability requirements of complex systems and key equipment. With the continu...

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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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