Robust predictive control method for stirring reaction tank

Abstract

The invention discloses a robust predictive control method for a stirring reaction tank, which comprises the following steps: establishing a quasi-linear structure model with a time-varying coefficient; constructing a polyhedron model capable of wrapping the future dynamic state of the stirring reaction tank system by utilizing the boundary information of the time-varying coefficient of the quasi-linear structure model, namely a state space model; and designing a robust prediction controller based on the state space model, and obtaining the optimal control input quantity w1(t) acting on the stirring reaction tank system by using the robust prediction controller, thereby adjusting the input flow w1(t) of a reactant A in real time, and achieving the purpose of controlling the concentration Cb(t) of a product C to track a set value. The robust predictive control method for the stirring reaction tank significantly increases the degree of freedom of the robust predictive controller in the process of optimizing the control rate online.

Description

technical field [0001] The invention belongs to the field of chemical production process control, and relates to a robust predictive control method for stirring reaction tanks, in particular to a robust predictive control method based on a variable feedback control rate. Background technique [0002] Stirring reaction tank is a common equipment in chemical production, which is widely used in the production and processing of pharmaceutical, food, petrochemical and other chemical enterprises. Since the stirring reaction process in actual production is usually a complex nonlinear system, there are often many intermediate variables in the reaction process, and the variables interact with each other, which has a strong nonlinearity. Therefore, it is often very difficult to obtain an accurate model of the reaction process using mechanistic modeling methods. At present, the system identification method driven by input and output data to obtain the model of the reaction process has...

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Problems solved by technology

This type of method needs to assume that the information of the steady-state equilibrium point of the system is known or measurable, but in the actual industrial system, this condition cannot be satisfied obviously.

For the actual stirred tank reaction process where the information of the steady state equilibrium point of the system cannot be obtained, "A robust predictive control method for a first-order continuous stirred tank reactor" (application number: 201610139588.8), "A control method based on multiple degrees of freedom Output Tracking Robust Predictive Control Method for Quantitative Design" (Application No.: 201710339307.8), respectively proposed a robust predictive control method that does not depend on the information of the steady-state equilibrium point of the system, but the future of this type of method when designing a robust predictive controller The feedback rate of the control quantity is fixed

In the above method, since a single feedback rate is used as the future control strategy, it will bring strong conservatism to the subsequent predictive controller design

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