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A thermal power plant sensor fault diagnosis method

A sensor fault and thermal system technology, applied in the direction of instruments, etc., can solve the problems of lack of redundant detection verification and analysis, low reliability, etc., and achieve the effect of fault diagnosis and data reconstruction

Active Publication Date: 2018-05-25
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing technical scheme adopts a single method, the method itself has certain limitations, lacks verification and analysis of redundant detection, and the reliability is not high

Method used

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  • A thermal power plant sensor fault diagnosis method
  • A thermal power plant sensor fault diagnosis method
  • A thermal power plant sensor fault diagnosis method

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] Such as figure 1 As shown in the figure, it is a flow chart of a sensor fault diagnosis method for thermal power system of a thermal power plant proposed by the present invention. The method includes:

[0025] Step 101): Sampling the sensor information data of the thermal system;

[0026] Step 102): Determine the order p according to the sensor information sampling data;

[0027] Step 103): selecting an autoregressive model according to the order p; ...

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Abstract

The invention relates to a method for diagnosing sensor faults in a thermodynamic system of a thermal power plant, comprising: sampling sensor information data of the thermal system; determining the order p according to the sensor information sampling data; selecting an autoregressive model according to the order p; determining the autoregressive parameters in the model, and at the same time determine the expression of the autoregressive model; use the autoregressive model to predict the output value of the sensor at the next moment, and generate a residual by comparing the predicted value of the sensor with the actual value to obtain the residual sequence; The error sequence is analyzed, and when all the residual sequences show that there may be a certain type of fault, it is judged that the sensor has this type of fault. The technical solution can quickly and accurately realize sensor fault diagnosis and data reconstruction, and is especially suitable for online applications.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a fault diagnosis method for a thermal system sensor of a thermal power plant. Background technique [0002] As an essential underlying component in thermal power plants, sensors play an important role in the safe and stable operation of the unit. During the normal operation of thermal power units, a large number of various types of sensors are used to measure important thermal process parameters, such as main steam temperature, main steam pressure, steam turbine speed, and drum water level. Once the sensor breaks down, the performance of the control system will be degraded, or it may cause serious accidents and cause major economic losses. There are many sensors in the thermal process of thermal power plants, which are distributed in multiple parts of various equipment. It is very difficult to detect sensor failures by manpower. Therefore, it is very necessary to judge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
Inventor 仇晓智周卫庆黄葆华刘双白
Owner STATE GRID CORP OF CHINA
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