Abstract
Violation of the symmetrical mode of operation of the electric network causes a deterioration in the quality of electric energy and significantly reduces the reliability of the functioning of electrical equipment and elements of the electric network. A mathematical model of an electrical network with a grounded neutral is proposed аnd a software package that allows us to evaluate the level of voltage asymmetry of a three-phase system depending on the changing unbalanced load was created. The simulation and calculation of the studied parameters for various combinations of loads and the technical means of balancing the operating mode of the electric network (the balancing device – BD) is carried out. Programs for the Matlab graphic editor are compiled and diagrams of changes in electricity quality indicators are constructed. A numerical analysis is carried out and recommendations are given to determine the most appropriate place for connecting the BD in the electrical network to improve the quality of electricity based on the calculation made.
Highlights
The growth of electricity consumption in rural areas has increased significantly due to the introduction of a large number of new electric receivers in residential areas, as well as new technologies in agricultural production
Violation of the symmetrical mode of operation of the electric network causes a deterioration in the quality of electric energy and significantly reduces the reliability of the functioning of electrical equipment and elements of the electric network
A numerical analysis is carried out and recommendations are given to determine the most appropriate place for connecting the balancing device (BD) in the electrical network to improve the quality of electricity based on the calculation made
Summary
The growth of electricity consumption in rural areas has increased significantly due to the introduction of a large number of new electric receivers in residential areas, as well as new technologies in agricultural production. The operating modes of rural low-voltage distribution networks are objectively unbalanced. The negative and zero voltage sequences have a very negative effect on electrical equipment. The zero sequence can lead to an abnormally large neutral bias voltage in normal modes and requires detailed consideration [3,4,5,6,7,8,9,10]. The zero sequence of currents creates additional losses of electricity, which increase its consumption, and create conditions for the occurrence of fires [11]
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