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Robust predictive control method for first-order continuous stirred tank reactor (CSTR)

A technology of predictive control and stirred tank, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of unknown and unmeasurable steady-state equilibrium point information

Inactive Publication Date: 2016-08-24
CENT SOUTH UNIV
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Problems solved by technology

However, due to the unavoidable existence of unmeasurable disturbances or modeling errors in the actual industrial nonlinear CSTR system, the steady-state equilibrium point information of the system is unknown or unmeasurable

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  • Robust predictive control method for first-order continuous stirred tank reactor (CSTR)

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Embodiment Construction

[0040] The application scenario diagram of the first-order reaction CSTR system of the present invention is as follows figure 1 Shown. An exothermic and irreversible reaction occurs in the first-stage reaction CSTR system. The reactant is A and the product is B. The reaction raw material A enters the reactor at a stable flow rate, and the reaction materials in the reactor flow out of the reactor at the same stable flow rate. As shown in Figure 1, the relevant parameters and values ​​of the first-order reaction CSTR system are: the concentration of component A in the reactor is C A , The reaction temperature of the reactor is T r , The coolant temperature is T c , The feed concentration of reactant A is C Af =1mol / L, the feed flow rate is Q f =100L / min, feed temperature is T f =350K, the reactor volume is V=100L, the specific heat is C p =0.239J / g·K, the product of the heat transfer coefficient and the surface area of ​​the reactor is UA h =5×10 4 J / (min·k). In the first-order ...

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Abstract

The invention discloses a robust predictive control method for a first-order continuous stirred tank reactor (CSTR). The method comprises the following steps: building a dynamic mathematical model of a non-linear CSTR system off line through a modeling method of a nonlinear state-dependent ARX model; secondly, constructing a non-linear dynamic variable linear polyhedral model capable of packing the CSTR system by using the structural features of the non-linear ARX model and change information of future non-linear dynamic features of the system contained in the model; and lastly, designing a CSTR system robust predictive control algorithm which is based on the non-linear ARX model, considers the robust stability of a CSTR system restraint, has good control performance and can realize optimal output tracking by resolving a convex optimization problem according to a min-max optimization principle based on an invariant set design method under the situation that steady-state balance point information of the CSTR system is unknown.

Description

Technical field [0001] The invention belongs to the technical field of automatic control, and relates to a robust predictive control method based on a non-linear ARX model design, in particular to a robust predictive control method for a first-order continuous stirred tank reactor (CSTR). Background technique [0002] Continuous Stirred Tank Reactor (CSTR) is a common nonlinear chemical reactor. Due to its strong heat exchange capacity, stable product quality and low cost, it is used in the core equipment of chemical production It occupies an important position and is widely used in industrial production such as dyes, pharmaceutical reagents, food and synthetic materials. The control variables of the CSTR system mainly include the temperature and concentration of the reactants, and the control effect of these variables will directly affect the production quality of chemical products. [0003] In the past few decades, the predictive control technology based on linear models has bee...

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Application Information

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IPC IPC(8): G06F17/50G05B13/04
CPCG05B13/04G06F30/367G06F2119/08
Inventor 彭辉周锋
Owner CENT SOUTH UNIV
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