Assessment of energy indicators of the power supply system in case of load current instability

The purpose of the work is to study and evaluate energy indicators in different sections of the power supply system with mechanical and reactor-thyristor voltage regulators in case of load current instability. To achieve this goal, the method of computer modeling using MatLab software, comparison methods and the theory of automatic control were used in the work. The study of energy indicators in individual sections of the power supply system was carried out in the Matlab environment on the developed block-modular model of a workshop transformer with a capacity of 1 MV∙A and a volt-age of 6/0,4 kV with an active-inductive nature of the load with a phase shift angle of the load current φ = 45 degrees. From the results of the study of energy indicators, it turned out that a controlled dual-band reactor-thyristor voltage regulator, while maintaining the quality of electricity, comprehensively increases energy performance in all sections of the power supply system. Comparative results of the study and their analyses to improve the quality of electricity and energy indicators in different sections of the power supply system with an uncontrolled and controlled voltage regulator showed the need to replace uncontrolled mechanical voltage regulators with a controlled dual-band reactor-thyristor voltage regulator with high speed, high accuracy and the ability to ensure continuous voltage regulation with external and internal changes in electrical parameters.