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Документ The efficiency of the active controlled rectifier operation in the mains voltage distortion mode(Національний технічний університет "Харківський політехнічний інститут", 2021) Krylov, D. S.; Kholod, O. I.Checking the efficiency of the active rectifier with differences types of control systems in conditions of deep voltage distortions of a three-phase three-wire supply network. Methodology. The authors have used the Matlab/Simulink software environment to create a model of an active rectifier with various types of control systems as part of a frequency electric drive. We performed a series of simulations of the operating modes of an active rectifier with various control systems when the supply voltage is distorted. Results. When the active rectifier is operating in an unregulated mode, the distortions of the current and mains voltage exceed the maximum permissible values. The quality indicators of the mains current and mains voltage are significantly higher than the normally permissible values. In the absence of voltage distortions in the supply network, the operation of the active rectifier can effectively eliminate the distortions of the mains current, regardless of the type of control system of the active rectifier. In conditions of deep distortions of the supply network voltage, the operation of an active rectifier with a vector control system is more efficient than with a parametric control system. Originality. Criteria for determining the quality of consumed electricity at the connection point of the circuit are proposed. Practical significance. Recommendations have been developed for the use of active rectifier control systems when working with a distorted power supply voltage.Документ Determination of the input filter parameters of the active rectifier with a fixed modulation frequency(Національний технічний університет "Харківський політехнічний інститут", 2022) Krylov, D. S.; Kholod, O. I.Development of a methodology for calculating the parameters of the active rectifier-voltage source input filter operating with a fixed modulation frequency to ensure electromagnetic compatibility with the supply network acceptable by standards at minimum values of the input inductance and checking its main characteristics on a mathematical model. Methodology. The authors have developed a methodology for calculating the parameters of the input filter of an active rectifier-voltage source. The calculation results are verified on the constructed mathematical model of a frequency converter, the scheme of which is an active rectifier and an autonomous voltage inverter. A series of experiments was carried out on a mathematical model to study the dependence of the total harmonic distortion of current and mains voltage on the value of the input inductance for various parameters of the input filter. Results. The structure and calculation procedure the input filter of an active rectifier operating with a fixed modulation frequency are proposed. The simulation results showed that the inclusion of a filter at the input of the active rectifier significantly improves its electromagnetic compatibility with the supply network in the entire range of variation of the input inductance of the circuit and makes it possible to achieve the values of the total harmonic distortion permissible by the norms. Originality. A structure and a calculation procedure the input filter of an active rectifier-voltage source operating with a fixed modulation frequency are proposed. Practical significance. The dependencies obtained in the article allow us to evaluate the relationship between the parameters of the filter elements and its characteristics among themselves and come to a compromise between them when designing a scheme for specific technical conditions.Документ Power electronics and converter technology(National technical university "Kharkiv polytechnic institute", 2022) Kholod, O. I.; Krylov, D. S.It is recommended to use those teaching aid when performing laboratory work on the discipline "Power electronics and converter technology" when studying the work of: smoothing filters in various schemes of uncontrolled rectifiers; controlled rectifiers with different types of load; pulse-width converters; autonomous current and voltage inverters on a virtual laboratory bench (VLB), which is a personal computer (PC) with the MatLab / Simulink software package installed on it. The purpose of virtual laboratory works is to consolidate theoretical knowledge, through calculations, modeling and detailed study of electrical processes in various schemes of semiconductor converters in steady-state and transient operating modes. The virtual laboratory bench allows you to study the parameters of circuits and their operation modes within a wide range.