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Sampling control method for two-stage chemical reactor

A chemical reactor and control method technology, applied in the direction of adaptive control, general control system, control/regulation system, etc.

Inactive Publication Date: 2021-04-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most analytical methods are based on continuous design methods, which have great limitations for nonlinear chemical reactor state space models

Method used

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  • Sampling control method for two-stage chemical reactor
  • Sampling control method for two-stage chemical reactor
  • Sampling control method for two-stage chemical reactor

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Experimental program
Comparison scheme
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Embodiment 1

[0127]Next, the validity of the design method in the present invention is verified through a two-stage chemical reactor model.

[0128] to combine image 3 , the system model of a two-stage chemical reactor system is:

[0129]

[0130]

[0131] where x 1 and x 2 is the output component of the reactor, R 1 and R 2 is the circulation flow, k 1 and k 2 is the chemical reaction constant, σ 1 and σ 2 is the reactor residence time, V 1 and V 2 is the reactor volume, F is the feed rate, δ 1 ( ) and δ 2 (·) is an unknown nonlinear function.

[0132] Set the value of each parameter: R 1 =R 2 =1,V 1 =V 2 =0.5,σ 1 = σ 2 = 1,k 1 =k 2 =1, F=0.5.

[0133] The unknown nonlinear function of the system is chosen as:

[0134]

[0135] Then the system (1) becomes the following nonlinear upper-triangular system with time-delay:

[0136]

[0137] Among them, the nonlinear function Set 1 is satisfied.

[0138] The designed control law is:

[0139]

[0140] ...

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Abstract

The invention discloses a sampling control method for a two-stage chemical reactor. The method comprises the following steps of firstly, modeling a two-stage chemical reactor to obtain a state space model of the chemical reactor; then, for the obtained system model, coordinate transformation being carried out on the system, adjustable parameters being introduced, and a new system after transformation being obtained; designing a corresponding linear discrete state observer for the unmeasurable state of the system, and estimating the state of the system; constructing an appropriate Lyapunov function, obtaining value ranges of adjustable parameters and a sampling period of a system by utilizing a Lyapunov stability theory, controlling sampling of a two-stage chemical reactor, and finally, controlling sampling of the two-stage chemical reactor by utilizing a variable parameter L and a sampling period T introduced in determined coordinate transformation. According to the method, the unknown state of the system can be well estimated, and sampling control stability of the two-stage chemical reactor is improved.

Description

technical field [0001] The invention relates to the technical field of nonlinear control, in particular to a sampling control method for a two-stage chemical reactor. Background technique [0002] For a kind of two-stage chemical reactor, if it is to control it and design a corresponding controller, it needs to be modeled first to obtain the state space model of the system. However, the state-space model of the chemical reactor is nonlinear, and the analysis and design method of the linear system cannot be used, which increases the difficulty of the design of the system controller. In order to solve this problem, for nonlinear systems, more and more scholars and experts have begun to devote themselves to the research of related control methods, and have produced many results, such as backstepping design method and power integrator method. [0003] In recent years, with the development of computer technology and microelectronics technology, computers have played a huge role ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 盛兆明马倩
Owner NANJING UNIV OF SCI & TECH