Structural and Parametric Optimization of Steam Boiler Injection Regulators

Steam temperature control significantly affects the efficiency, reliability and durability of steam boilers. In the article, special attention is paid to substantiating the relevance of a significant increase in the efficiency of steam boiler injection regulators operating in a wide range of load changes. It is indicated that one of the main directions of solving this problem is the use of optimal regulators with dynamic compensation and combined principles of regulation for deviation and perturbation at the same time. A combined automatic control system is proposed with full invariance with respect to the most dangerous measured internal disturbance and with partial invariance when working out an external disturbance with specified permissible deviations of the controlled parameter. At the same time, in order to improve the quality of regulation under the main influences, it is proposed to carry out optimization with the use of the transfer functions of the leading and main sections of the control object as well as to turn the internal contour of the two-circuit system into an amplifier with a single transmission coefficient when working out the corrective action. Also, it is proposed to form the structure of the corrective regulator on the basis of the principle of dynamic compensation for objects with a conditional delay along the channel of regulatory action, which makes it possible to ensure the specified quality of regulation when working out the control action surge. Thus, a significant increase in speed and accuracy is achieved when working out internal and external measured disturbances compared to a typical two-circuit system or an invariant automatic control system with an internal model, which makes it possible to recommend the proposed invariant cascade automatic control system for widespread implementation in the field of automation of thermal power processes.

1. Pletnev G. P. (2007) Automation of Technological Processes and Productions in Thermal Power Engineering. 4th Ed. Moscow, MEI Publishing House. 352 (in Russian).

2. Klyuev A. S., Lebedev A. T., Novoselov S. I. (1985) Adjustment of Automatic Control Systems of Steam Boilers. Moscow, Energoatomizdat Publ. 280 (in Russian).

3. Egupov N. D. (ed.) (2000) Methods of Classical and Modern Theory of Automatic Control: Textbook in 3 Volumes. Vol. 2: Synthesis of Regulators and Theory of Optimization of Automatic Control Systems. Moscow, Publishing House of Bauman Moscow State Technical University. 736 (in Russian).

4. Rotach V. Ya. (1961) Calculation of the Dynamics of Industrial Automatic Control Systems. Moscow–Leningrad, Gosenergoizdat Publ. 344 (in Russian).

5. Rotach V. Ya. (1973) Calculation of Dynamics of Industrial Automatic Control Systems. Moscow, Energiya Publ. 440 (in Russian).

6. Rotach V. Ya. (2008) Theory of Automatic Control. 5th Ed. Moscow, MEI Publishing House. 396 (in Russian).

7. Shirokii D. K., Kurylenko O. D. (1972) Calculation of Parameters of Industrial Control Systems. Kyiv, Tekhnika Publ. 232 (in Russian).

8. Ankhimyuk V. L., Opeyko O. F., Mikheev N. N. Theory of Automatic Control: a Textbook for University Students of Electrical Engineering Specialties. Minsk, Dizain PRO Publ. 352 (in Russian).

9. Kuzmitskii I. F., Kulakov G. T. (2010) Theory of Automatic Control. Minsk, BSTU. 574 (in Russian).

10. Kulakov G. T., Kulakov A. T., Kravchenko V. V., Kukhorenko A. N., Voyush N. V. (2022) Theory of Automatic Control. Minsk, Vysheishaya Shkola Publ. 197 (in Russian).

11. Kulakov G. T., Kulakov A. T., Voyush N. V. (2022) Synthesis of Invariant Automatic Control Systems with an Internal Model. Energetika. Izvestiya Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii SNG = Energetika. Proceedings of CIS Higher Education Institutions and Power Engineering Associations, 65 (6), 539–550. https://doi.org/10.21122/1029-7448-2022-65-6-539-550 (in Russian).

12. Konovalov M. A. (2009) Problems of Automation of Inertial Thermal Power Facilities. Kyiv, Feniks Publ. 312 (in Russian).

13. Kulakov G. T., Kulakov A. T., Artsiomenka K. I. (2018) Parametric Optimization for Automatic Control System of 300 MW Power Units at a Constant Steam Pressure Upstream of the Turbine. Energetika. Izvestiya Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii SNG = Energetika. Proceedings of CIS Higher Education Institutions and Power Engineering Associations, 61 (5), 451–462. https://doi.org/10.21122/1029-7448-2018-61-5-451-462 (in Russian).

14. Kulakov G. T., Kulakov A. T., Artsiomenka K. I. (2018) Parametric Optimization for Automatic Control System of Power Units of 300 MW for the Mode of Variable Pressure of Turbine Inlet Steam. Energetika. Izvestiya Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii SNG = Energetika. Proceedings of CIS Higher Education Institutions and Power Engineering Associations, 61 (6), 539–551. https://doi.org/10.21122/1029-7448-2018-61-6-539-551 (in Russian).

15. Artsiomenka K. I. (2019) Structural-and-Parametric Optimization of Automatic Control System for Power Units of 300 MW in Wide Range of Load Variations. Enеrgеtika. Proс. СIS Higher Educ. Inst. аnd Power Eng. Assoc. 62 (5) 469–481. https://doi.org/10.21122/1029-7448-2019-62-5-469-481 (in Russian).

16. Kulakov G. T., Artsiomenka K. I. (2020) Synthesis of Boiler Controllers of the Automatic Power Control System of Power Units. Energetika. Proc. CIS Higher Educ. Inst. and Power Eng. Assoc. 63 (3), 223–235. https://doi.org/10.21122/1029-7448-2020-63-3-223-235 (in Russian).