Koshelenko E. Energy efficiency of modes of electrotechnical complexes of enterprises and cities

Koshelenko Ie.V. Energy efficiency of modes of electrotechnical complexes of enterprises and cities. – Qualifying scientific work on the rights of the manuscript. The thesis for getting a scientific degree of the candidate of technical sciences on specialty 05.09.03 – electrotechnical complexes and systems. – Dnipro University of Technology, Ministry of Education and Science of Ukraine, Dnipro, 2021. The dissertation is devoted to the research an important scientific challenge which consists in increasing the energy efficiency of operating modes of electrical complexes of enterprises and cities (ECEC) with a complex influence of asymmetric and nonlinear load by establishing the regularity of the flow of electromagnetic processes, influence of profiles of electrical energy consumption, electromagnetic interference, thermal inertia of equipment on the choice of rational parameters of its typical size structure. An improved method and algorithm for the selection of the rated power of power transformers in the ECEC is proposed, which takes into account the parameters of the operating modes of the equipment, the type of consumers, the 20 thermal inertia of individual elements of the systems, the influence of factors of the surrounding electromagnetic environment at different levels of the hierarchy of the electrical energy distribution system and allows to adequately determine the rational value of transformer’s rated power in real operating conditions. The influence of the parameters of the quality of electrical energy on the decrease in the reliability index and the reduction in the service life of the main equipment of the ECEC is analyzed. The regularities of the influence of standard-size optimization of ECEC elements on the improvement of the electromagnetic environment at hierarchical levels have been established, which makes it possible to comprehensively improve the energy efficiency of their operating modes. The economic feasibility of using the rational structure of the EKPG equipment in accordance with the regulated period in terms of capital and operating costs with a simultaneous decrease in electromagnetic damage has been proved. Keywords: energy efficiency, electrical complex, transformer substation, rational power, power supply system, resource saving, electromagnetic compatibility.