Method for designing controller of non-minimum-phase constant-temperature continuous stirred tank reactor

Abstract

The invention discloses a method for designing a controller of a non-minimum-phase constant-temperature continuous stirred tank reactor. According to the method for designing the controller, the stability of the zero dynamic inside a system can be guaranteed while it is guaranteed that the external dynamic of the system meets the performance requirement. The method for designing the controller of the non-minimum-phase constant-temperature continuous stirred tank reactor comprises the steps that firstly, system modeling is conducted on the continuous stirred tank reactor (CSTR) according to the actual production process, so that a nonlinear mathematical model of a control system is obtained; secondly, accurate feedback linearization is conducted on an obtained nonlinear system according to the state feedback linearization theory, so that a linear standard form of the nonlinear system is obtained; finally, the nonlinear controller of the constant-temperature CSTR having the non-minimum-phase characteristic is obtained based on the linear standard form according to the quadric form optimal control theory and the Lyapunov stability theory. The controller can be finally obtained through a digital signal processor, namely a DSP controller, by means of software programming.

Description

technical field [0001] The present invention relates to a controller design and construction method for a non-minimum phase isothermal continuous stirred tank reactor (CSTR), in particular to a controller design and construction method for the actual chemical production process of producing cyclopentene using CSTR , belonging to the field of automatic control technology. Background technique [0002] CSTR is a kind of reactor widely used in polymerization chemical reaction. It is a typical and highly nonlinear chemical reaction system in the process industry. The chemical production process of using CSTR to produce cyclopentene has typical nonlinear and non-minimum phase characteristics. The stable control of systems with nonlinear and non-minimum phase characteristics has always been the focus of people's research, resulting in various control methods and strategies, among which the approximate linearization method and the differential geometry method are the two most comm...

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Problems solved by technology

For a non-minimum phase system (that is, a system with zero dynamic instability), it is difficult to ensure the stability of the internal zero dynamics of the system with a controller designed only for the linear subsystem that can make the external dynamics meet certain performance requirements, so the non-minimum phase characteristic Makes exact feedback linearization methods based on differential geometry extremely challenging

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