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Online method for testing model of industrial unstable time lag procedure

A process model, stable technology, applied in the field of detection, can solve the problems of poor model detection accuracy and not completely solved

Inactive Publication Date: 2009-04-08
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method not only needs to know the static gain of the object in advance, but also suffers from poor model detection accuracy in the presence of interfering noise.
How to design a relay feedback experiment to quickly and effectively obtain the three model parameters of a first-order unstable time-delay object online, how to expand the existing upper limit of the ratio of time delay to time constant to 0.693, how to improve the accuracy of model detection, and how to overcome external interference And the model mismatch problem, so as to alleviate the control problem brought by the model error to the system has not been completely solved

Method used

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  • Online method for testing model of industrial unstable time lag procedure
  • Online method for testing model of industrial unstable time lag procedure
  • Online method for testing model of industrial unstable time lag procedure

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Embodiment

[0053] Embodiment: This embodiment is aimed at an object, assuming that its dynamic characteristics will be affected by external perturbation and will change during the self-tuning control process of the system. Part of the method for analyzing and calculating system model parameters in this embodiment can be programmed, and the compiled program is installed in the device in advance.

[0054] For a chemical boiler drum water level object, the dynamic characteristics are as follows:

[0055] 1 s - 1 e - 0.4 s

[0056] Application of the model detection method provided by the present invention, the specific implementation process is as attached Figure 4 Shown:

[0057] Step 1: Follow the attached figure 1 The structure diagram shown builds a relay feedback test system; the input and output characteristics o...

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Abstract

A method for on-line detecting industrial unstable time-lag process model includes separately recording down output array of relay and object and storing said array in random access storage when complete closed-loop system is entered into oscillation process, analyzing data to judge whether waveform outputted from object is limit cycle with stable oscillation or not, calculating out parameter of system model after key measurement information is stored in databank of computer if it is or otherwise regulating parameter of PD controller to make system output stable limit cycle and calculating out parameter of system model as per key information.

Description

technical field [0001] The invention relates to a method in the technical field of detection, in particular to a method for online detection of an industrial unstable time-delay process model. Background technique [0002] Unstable objects in the chemical process are ubiquitous, such as drum boilers, chemical continuous stirring reactors, and thermal reactors in the energy industry. Because the process with unstable characteristics, especially the unstable process with obvious time delay, is more sensitive to load disturbance, it is easy to cause large fluctuations in the process output, so it is difficult to detect and control it. Industrial practice shows that the self-tuning of the controller is a very necessary and useful function. The so-called self-tuning means that the parameters of the controller can be automatically adjusted according to the needs of the user or an external signal. The user can start the self-tuning process by pressing a button or sending a command...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B17/02G05B19/418
CPCY02P90/02
Inventor 张卫东顾诞英王萍蔡云泽
Owner SHANGHAI JIAOTONG UNIV
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