CO2 supercritical extraction temperature fraction order PID control method

A technology of extraction temperature and control method, which is applied in the direction of temperature control using electric mode, which can solve the problems of non-linearity and difficulty in ensuring precise control of extraction temperature, and achieve the effect of improving performance and overcoming many setting parameters

Inactive Publication Date: 2015-09-23
CHANGCHUN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the conventional feedback control method is difficult to ensure the precise control of the extraction temperature due to the time-varying and nonlinear characteristics of temperature and other parameter

Method used

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  • CO2 supercritical extraction temperature fraction order PID control method
  • CO2 supercritical extraction temperature fraction order PID control method
  • CO2 supercritical extraction temperature fraction order PID control method

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Embodiment Construction

[0049] The method of the present invention includes the following steps:

[0050] 1. The temperature control system used mainly includes: analog quantity acquisition circuit, fractional PID controller, PWM drive circuit. The present invention expresses the transfer function in a fractional-order system, and the response ability, anti-interference ability and adjustment ability of the fractional-order PID control method are better than those of the integer-order PID control method. The combination of internal model control and fractional-order control can overcome the controller The disadvantages of more tuning parameters can improve the performance of the control system. At the same time, based on OPC technology, WinCC is used as a bridge to enable MATLAB / Simulink and S7-200PLC to realize real-time communication, and the fractional PID control algorithm on Simulink can control the temperature of the extraction kettle. Perform real-time control.

[0051] 2. Establish a temperature ...

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Abstract

The invention discloses a CO2 supercritical extraction temperature fraction order PID control method. In the method, internal model control and fractional-order control are combined; a disadvantage that there are many controller setting parameters is overcome and performance of a control system is improved. Simultaneously, based on an OPC technology, a WinCC is used as a bridge so that MATLAB/Simulink and S7-200PLC can realize real-time communication. On the Simulink, real-time control can be performed on kettle temperature extraction through using a fraction order PID control algorithm. By using the method in the invention, accurate control of the temperature can be effectively realized so that application of intelligent control in an actual industrial control system is realized.

Description

Technical field [0001] The invention relates to a production process of carbon dioxide supercritical extraction, in particular to the application of a fractional PID control method based on internal mold setting in temperature control in a carbon dioxide supercritical extraction process. Background technique [0002] In the past two to three decades, with the advancement of science and technology and the improvement of living standards, people have gained a new understanding of health and the environment, and have put forward higher standards and requirements for products related to physical and mental health such as food, medicine, cosmetics, and related production methods. Although in recent years, CO, as one of the new technologies representing the concept of "clean chemical" and "green chemistry", 2 The practical application of supercritical extraction has made great progress. However, due to the lack of basic data on the phase equilibrium of the supercritical fluid system and...

Claims

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Application Information

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IPC IPC(8): G05D23/19
Inventor 李丙林尤文魏洪波
Owner CHANGCHUN UNIV OF TECH
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