Известия Томского политехнического университета: Инжиниринг георесурсов (May 2019)
Energy saving modes of centrifugal pumps installations with asynchronous engines
Abstract
Relevance of the research: Increasing technological requirements to the quality of production processes associated with non-viscous liquid pumping indicate the need to improve the operating conditions of liquid transfer systems with centrifugal pumps, including the improvement with the help of mathematical modeling. Installations of centrifugal pumps are modeled as a rule using the generalized integral characteristics which do not allow studying the behavior of the system under dynamic operating conditions. While, this consideration of dynamic models of centrifugal pump units included in the electrical systems allows realizing the most efficient modes of operation, both in terms of energy efficiency and reliability. Fluid pumping stations, due to technological processes have one of the highest potential of applying energy-saving technologies that is one of the areas of the country development and it reveals the relevance of the topic according to the presidential decree of June 4, 2008 № 889, the Federal Law of the Russian Federation № 261, and the Energy Strategy of Russia for the period up to 2030. The main aim of the study is to determine the frequency steering laws of centrifugal pump installations at which the minimum losses in the power conversion channel occur and to develop the methodology for constructing voltage-frequency characteristics. The methods used in the study: frequency electric drive and electric machines methods, methods of operational calculus, the theory of numerical methods for solving nonlinear systems of differential equations, methods of the theory of hydraulics, theory centrifugal machines. The authors used Maple, MatLab / Simulink. The results: The authors investigated characteristics of centrifugal pump installations by means of numerical experiments, developed the technique of constructing the adjustment of voltage- frequency characteristics with scalar frequency control of asynchronous motor depending on operation modes of external drainage system.
