Real-time data abnormal diagnosis method for monitoring operation of nuclear power unit

Abstract

The invention discloses a real-time data abnormal diagnosis method for monitoring operation of a nuclear power unit. The method comprises the following steps: selecting a plurality of important variables for monitoring operation of the nuclear power unit to form a real-time data anomaly diagnosis variable set, establishing an abnormal diagnosis model through the principal component analysis and the independent element analysis technology, determining a control limit used for judging whether an abnormal event occurs in the real-time operation data or not through the nuclear density estimation technology; meanwhile setting an automatic updating mechanism of the model to ensure the precision of the model. The method disclosed by the invention overcomes data model 'ill-condition' problems caused by the characteristics of the actual industrial data such as serious correlation and redundancy, random noise, mode variability, intrinsic nonlinearity and the like, 'false alarm' and 'missed alarm' can be effectively avoided. The method is suitable for real-time monitoring of the nuclear power unit and early warning and diagnosis of the ''abnormal event or accident'', and is beneficial to improving the safety of the nuclear power unit.

Description

technical field [0001] The invention relates to the fields of on-site debugging and commercial operation before the start-up of nuclear power units, in particular to a real-time data abnormality diagnosis method for nuclear power unit operation monitoring. Background technique [0002] Unexpected conditions may occur during the operation of nuclear power units, such as tripping, tripping, primary circuit leakage, etc. At this time, it is necessary for the operation, maintenance and debugging staff to analyze the cause of the failure and judge the trend of the failure through the process data. At present, all newly-built nuclear power units in the world have adopted advanced main control room design and fully applied digital instrument control system (DCS for short) to realize centralized monitoring, flexible operation and control and protection functions of the process system of the whole plant. However, as far as the CPR1000 nuclear power unit with independent intellectual...

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Problems solved by technology

Since such judgment criteria are mostly determined by the dynamic nature of the system being diagnosed, the previous method of simplifying the system characteristics is naturally incompetent.

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