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The optimal control of dynamic loads in a pump complex with adjustable pipeline valves

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Category: Geotechnical and mining mechanical engineering, machine building

Last Updated on 04 August 2016

Published on 04 August 2016

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Authors:

M.Zagirnyak, Corresponding Member of the National Academy of Pedagogic Sciences of Ukraine, Dr. Sc. (Tech.), Prof., Kremenchuk Mykhailo Ostrohradskyi National University, Kremenchuk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

О.Kravets, Kremenchuk Mykhailo Ostrohradskyi National University, Kremenchuk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

T.Korenkova, Cand. Sc. (Tech.), Kremenchuk Mykhailo Ostrohradskyi National University, Kremenchuk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Determination of the optimum law of control for locking and regulating valve electric drive, providing change in pressure in hydronetwork within the admissible limits and minimum time of pipeline valve control in emergencies at forced outage of the power supply system.

Methodology. A control method for locking-and-regulating pipeline valve electric drive has been substantiated taking into account the nonlinear dependence of the stopcock hydraulic resistance coefficient on a relative degree of the stopcock opening. Using the telegraph equations apparatus and finite element method, a mathematical model of a pump complex has been worked out taking into consideration wave processes in the hydronetwork, which occur during control of pipeline valves with electric drive. Applying the dynamic programming method, the optimum law of control of the stopcock electric drive for the pump complex emergency operation modes has been determined.

Findings. It has been proved that generation of irregular control of pipeline valves with electric drive is an efficient method for reduction of dynamic loads in the pump complex. A quality criterion for a closed electromechanical system of dynamic load reduction in a pump complex has been offered. Weight coefficients at quality criterion components in its emergency and operating modes have been substantiated. An optimum law of control of the valve frequency-controlled electric drive has been determined. This law provides change in pressure in the hydrosystem within admissible limits and the most rapid control of pipeline valves in emergencies.

Originality. Expediency of developing an irregular law of locking and regulating pipeline valve electric drive has been theoretically proved which takes into account nonlinear dependence of the stopcock hydraulic resistance coefficient on a relative degree of opening at the whole interval of its actuator movement. For the first time a mathematical model of a pump complex has been proposed allowing research of the influence of various laws of pipeline valve control on the value of pipeline network dynamic loads caused by occurrence of surges in its emergency and operating modes.

Practical Value. A structure of an electromechanical system of reducing dynamic loads in a pipeline network on the basis of a locking and regulating valve frequency-controlled electric drive with a standby power supply has been substantiated. It will allow eliminating inadmissible pressure growths in the hydrosystem, extending manufacturing equipment life time, improving reliability and efficiency of pump complex functioning in emergencies.

References / Список літератури

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2. Manlin Zhu, Xiaohong Zhang, Yanhe Zhang, and Tao Wang, 2006. Study on Water Hammer Prevention in Pumping Water Supply Systems by Multi-valves. Proceedings of ICHIT Cheju Island, pp. 342–346.

3. Wu Juan and Kou Ziming, 2010. Study on the dynamic characteristic of the controllable gate valve in the mine automatic draining system. Proceedings of ICAEE Beijing, pp. 35–39.

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5. Bergant, A. and Simpson, A.R.,1991. Water Hammer Analysis of Pumping Systems for Control of Water in Underground Mines. Proceedings of Mine Water Congress Ljubljana, pp. 9–20.

6. Larock, B.E., Jeppson, R.W. and Watters, G.Z., 2000. Hydraulics of pipeline systems. Florida: CRC Press LLC.

7. Nicolet, A.C., Kaelbel, T., Alligne, S., Ruchonnet, N., Allenbach, P., Bergant, A. and Avellan F., 2011. Simulation of Water Hammer Induced Column Separation through Electrical Analogy. Proceedings of Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, pp. 1–9.

8. Zagirnyak, M.V., Kravets, А.M. and Korenkova, T.V., 2012. Determination of the power of pipeline valves regulated electric drive. Izvestiya vuzov. Elektromekhanika, Vol. 3, pp. 24–28.

9. Zagirnyak, M.V., Rodkin, D.I. and Korenkova, T.V., 2014. Estimation of energy conversion processes in an electromechanical complex with the use of instantaneous power method. In: Proceedings of 2014 IEEE 16th International Power Electronics and Motion Control Conference and Exposition (PEMC). Antalya, Turkey, pp. 238–245.

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2016-07-29  1.03 MB  857

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