Design of precise control systems of industrial plants

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.98941

Keywords:

precise automated control system, reactor, vitamin B6, nonlinear mathematical model

Abstract

The research is conducted due to the need to modernize automated control systems of continuous industrial processes, improve their accuracy and quality. The approach to the design of precise control system is developed. The approach is based on a set of models. Based on the known analytical relationships, the mathematical model of the dynamics of a nonlinear control object is developed. Its feature is a full accounting of the kinetics and thermodynamics of the first-order chemical reaction. The model for direct determination of the hydraulic friction coefficient, based on the approximation of the Colebrook-White nomogram is developed. The model of the valve hydrodynamics, depending on the opening rate and flow velocity is developed. The models of automation hardware, considering characteristics, errors and dynamics are developed.

The optimal multivariable controller on the basis of the theory of analytical design of controllers is designed. The proportional - integral action of the controller is formed by the extension of the object model. A full measurement of the object states made it possible to abandon the use of a state observer.

The precise automated control system of the vitamin B6 synthesis reactor is developed. The transients resulting from the automated control system modeling demonstrate deviations of the controlled plant parameters from the nominal value: concentration – no more than 5 %, temperature – no more than 2.5 %, and level – within 2 % under significant disturbances in feedstock consumption rates at the reactor input (20–30 %). Due to small deviations of transients under the action of disturbances, the proposed precise automated control system ensures the high quality of the product and the process safety in the reactor. The developed approach is recommended for use in the design of precise control systems, and the designed precise automated control system of the vitamin B6 production reactor – in the pharmaceutical industry.

Author Biographies

Oleksii Stopakevych, Odessa National Polytechnic University Shevchenko ave., 1, Odessa, Ukraine, 65044

PhD, Associate Professor

Department of automation of power processes

Olena Ulitska, Odessa National Polytechnic University Shevchenko ave., 1, Odessa, Ukraine, 65044

PhD

Department of automation of power processes

References

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Published

2017-04-26

How to Cite

Stopakevych, O., & Ulitska, O. (2017). Design of precise control systems of industrial plants. Eastern-European Journal of Enterprise Technologies, 2(2 (86), 56–62. https://doi.org/10.15587/1729-4061.2017.98941

Issue

Vol. 2 No. 2 (86) (2017): Information technology. Industry control systems

Section

Industry control systems

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Copyright (c) 2017 Oleksii Stopakevych, Olena Ulitska

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