A Robust Fault Diagnosis Method for Chemical Liquid Level Process Control System

A process control system and fault diagnosis technology, applied in the chemical industry, can solve problems such as easy to burn dry pot, overflow danger, steam with water, etc., achieve high sensitivity, ensure robustness, and strong robustness

Active Publication Date: 2021-05-25
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For example, the common boiler in chemical plants is a kind of steam equipment. In the actual production process, in order to ensure the normal operation of the boiler, the liquid level of the boiler needs to be maintained within a safe value range. If the liquid level is too low, it is easy to burn dry. If the liquid level in the boiler is too high, there will be water in the steam and there will be a danger of overflow

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  • A Robust Fault Diagnosis Method for Chemical Liquid Level Process Control System
  • A Robust Fault Diagnosis Method for Chemical Liquid Level Process Control System
  • A Robust Fault Diagnosis Method for Chemical Liquid Level Process Control System

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] The present invention takes the chemical process liquid level control system model as the implementation object, and proposes a robust fault diagnosis method for the uncertain switching linear system of the chemical process liquid level control system, based on a proportional integral observer. Fault diagnosis, this method theoretically realizes the elimination of external disturbances in the fault diagnosis system, and can also meet the fault detection and estimation of the system.

[0052] Note: In this invention, the P T ,P -1 respectively represent the transposition of the matrix P and the inverse matrix of the matrix, P>0 (Pn Represents an n-dimensional real vector set, and I and 0 represent the identity matrix and 0 matrix with appropriate dimensions. For a vector A, sym(A)=A T +A, * in the text represents the symmetric item in the symmetric matrix. ...

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Abstract

The invention relates to the technical field of chemical industry, and discloses a method for robust fault diagnosis of a chemical liquid level process control system, comprising: step 1 establishing and simplifying a state equation and an output equation of a chemical process liquid level control system model; step 2 According to the system equation described in step 1, a fault diagnosis observer is designed; step 3 constructs the system error dynamic equation; step 4 analyzes the sensitivity and robustness of the system, and obtains the gain matrix L of the fault diagnosis observer i and H i ; Step 5 set the threshold J th , to construct the residual evaluation function. Compared with the prior art, the present invention can detect the faults that occur online and accurately estimate the faults, has high sensitivity and strong robustness, realizes the elimination of external disturbances by the fault diagnosis system, and has important Practical reference value.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a robust fault diagnosis method for a chemical liquid level process control system. Background technique [0002] In recent years, due to the rapid development of science and technology, the production process of modern chemical industry is developing in the direction of large-scale, complex and intelligent integration. It is precisely because the structure of the production system is becoming more and more complex and sophisticated, and the various parts of the system are related and coupled with each other. If a part of the system fails, it may cause the entire production process to fail to operate normally, which will inevitably lead to a great extent. It will greatly reduce production efficiency, thereby affecting the economic benefits of enterprises and the country, causing huge economic losses, and is very likely to have a significant impact on the environment. E...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
CPCG05B23/024G05B2219/24065
Inventor 杜董生杨月赵环宇白秋产唐中一
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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