Novel composite tracking control method for chemical intermittent process

A control method and composite tracking technology, applied in the field of automation, can solve the problems of chemical intermittent process lag, system stability and control performance decline, and achieve the effect of good control performance.

Active Publication Date: 2018-11-13
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, the problem of serious lag in chemical batch process is common in the expansion of industrial proce

Method used

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  • Novel composite tracking control method for chemical intermittent process
  • Novel composite tracking control method for chemical intermittent process
  • Novel composite tracking control method for chemical intermittent process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] Take the water injection process control of a three-capacity water tank as an example:

[0057] Each water injection process in the process can be regarded as an intermittent process, and the adjustment method is to control the height of the liquid level by adjusting the flow rate of the pump.

[0058] Step 1. Establish a model of a chemical batch process, specifically:

[0059] In the chemical batch process, the discrete state space model is established for the system with partial actuator failure as follows:

[0060]

[0061] Among them, t represents a finite discrete time, k is a periodic index, and k takes any natural number; i=1,2,...r; r is any non-zero natural number; z(t,k) represents the state of the liquid level in the water tank;

[0062]

[0063] z j (t, k) is the jth elastic language variable, j=1,2,...,p, p represents the number of conditional language variables; M ij (z j (t,k)) is z j (t,k) in an elastic language set M ij The membership funct...

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Abstract

The invention discloses a novel composite tracking control method for a chemical intermittent process. The method comprises the following steps of establishing a discrete model of the chemical intermittent process by utilizing a local nonlinear method, and then introducing a tracking control law, defining the state error of the system and the tracking output error to obtain an expanded process control system, adopting a compensation control algorithm to design an updating rule, obtaining the gain of the controller according to a closed-loop system model and the stability condition to further obtain the updating rule and a control rule. Compared with a traditional control strategy, the novel composite tracking strategy provided by the invention has the advantages that the good tracking characteristics are achieved by adopting tracking feedback control of tracking control along the process direction, and better control performance of the system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of automation and relates to a novel compound tracking control method. Background technique [0002] With the development of industry, industrial process control is widely used in chemical industry, medicine, biological products, modern agriculture and other fields. With the increase of product demand, the scale of automatic control system is gradually expanded, and mass production needs to be run in a complex environment. But in the case of limited production technology, production machines may break down under long-term operation. From the point of view of safe production and economic benefits, it is hoped that after the fault is fixed, the system is still stable and has certain tracking control performance. The problem of serious lag in chemical batch process is common in the expansion of industrial process, which will affect the stability of the system and the decline of control performance to a certai...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 张日东李平
Owner HANGZHOU DIANZI UNIV
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