Method for model quality statistics of on-line monitoring closed-loop control system

A technology of closed-loop control and system model, which is applied in general control system, control/regulation system, adaptive control, etc., and can solve problems such as inability to monitor process model mismatch in real time

Inactive Publication Date: 2018-10-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for statistically monitoring the model q...

Method used

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  • Method for model quality statistics of on-line monitoring closed-loop control system
  • Method for model quality statistics of on-line monitoring closed-loop control system
  • Method for model quality statistics of on-line monitoring closed-loop control system

Examples

Experimental program
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Effect test

Embodiment 1

[0156] The following takes the Wood-Berry distillation column process as Example 1 to further illustrate the method for on-line monitoring of the model quality of the closed-loop control system provided by the present invention.

[0157] Wood-Berry distillation column process such as image 3 As shown, the specific process is as follows: (1) raw material D enters from the feed plate, and the feed plate divides the whole rectification tower into a rectification section and a stripping section; (2) after the solution enters the rectification tower, due to methanol It has a different boiling point from water, which causes the low boiling point components to vaporize and rise upwards, while the high boiling point components mostly flow down with the liquid, and rise on the trays with the rising steam in the rectification column Carry out sufficient contact, thereby carry out the process of heat transfer and mass transfer; (3) after the liquid flowing to the raw material F flows to...

Embodiment 2

[0177] The method for on-line monitoring of the model quality of the closed-loop control system provided by the present invention will be further described below by taking the liquid mixing process of a continuous stirring tank as Example 2.

[0178] Continuously stirred tank liquid mixing process such as Figure 14 As shown, the specific process is as follows: the unmixed liquid enters the continuous mixing tank through a pipe, and is fully mixed in the tank, and finally flows out from the outlet of the mixing tank. Among them, C in Indicates the concentration at the inlet of the pipe, C out Indicates the concentration at the outlet of the stirring tank, V p Indicates the volume of the pipe, V t Represents the volume of the continuous stirring tank, and q represents the flow rate of the liquid in the pipeline.

[0179] According to the law of conservation of mass, the liquid mixing process is described by differential equations as follows:

[0180]

[0181] Among them...

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Abstract

The invention discloses a method for model quality statistics of an on-line monitoring closed-loop control system. The method comprises: using closed-loop data in a normal stage to obtain a model mismatch detection index in the normal stage; obtaining a control chart for monitoring the model mismatch detection index in the normal stage according to a progressive statistical distribution of the model mismatch detection index in the normal stage; calculating a sample mean value and a sample standard deviation of the model mismatch detection index in the normal stage, and obtaining a control lineand an alarm line of the control chart of the model mismatch detection index in the normal stage; using the closed-loop data in a monitoring phase to obtain a model mismatch detection index in the monitoring phase, wherein a controlled object of the closed-loop control system is not changed if the model mismatch detection index in the monitoring phase is within the control line, otherwise the process model quality of the closed-loop control system is changed. The method enables online evaluation of the process model quality of the closed loop control system.

Description

technical field [0001] The invention belongs to the technical field of industrial control, and more specifically relates to a method for statistically monitoring the model quality of a closed-loop control system on-line. Background technique [0002] With the development of automatic control technology, model-based controllers are widely used in contemporary industry. Since the difference between the process model and the real object will directly affect the control performance, the quality of the process model of the controller is very important to improve the control performance of the closed-loop control system. In recent years, researchers at home and abroad have discussed the influence of process model mismatch on control performance. Researchers point to process model mismatch as a common cause of poor control performance. [0003] The detection and diagnosis of process model mismatch has become a research hotspot and focus in academia and industry. In the prior art...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 凌丹郑英汪上晓张洪张永
Owner HUAZHONG UNIV OF SCI & TECH
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