Three-level three-phase inverter with sineusidal voltage in the autonomous power system of critical electric receivers of mining industry enterprises

The work pays attention to the issues of improving an autonomous inverter that forms a three-phase voltage system, the harmonic composition of which fully satisfies modern requirements for the quality of electrical energy for 0.4 kV networks. Such an inverter, built on the basis of transformer technology and operating at an industrial network frequency of 50 Hz without the use of high-frequency pulse-width modulation, does not create powerful electromagnetic interference and does not contribute to accelerated wear of the insulation of the connected equipment. Minimization of harmonic coefficients of output voltages is solved in two stages: within the framework of the optimization problem, which involves searching for optimal forms of supply voltages and currents for uniform loading of transformer winding sections, and within the framework of the problem of rational selection of passive sine filters. This together made it possible to obtain a three-phase alternating current inverter with almost sinusoidal voltages, which can serve as the basis for creating autonomous and backup power systems for remote and critical consumers of electrical energy, which belong to the industrial infrastructure of mines, mines and pits. The possibility of smooth adjustment of voltage levels at the inverter output within ±6% has been studied, which can be useful in correcting the operating modes of the power supply system. To confirm the reliability of the results obtained, a physical model of the autonomous three-phase inverter under consideration was built and tested. The experimental results confirm the correctness of the stated theoretical principles and indicate the practical achievability of obtaining three-phase voltage systems with a total coefficient of harmonic components of the order of 4.87%, which is 1.64 times lower than the threshold of 8% established in the standards for the quality of electrical energy.

Myatezh S. V., Lisitsyn P. S., Kravchenko D. P., Malozyomov B. V., Chernov A. A. Three-level three-phase inverter with sineusidal voltage in the autonomous power system of critical electric receivers of mining industry enterprises. MIAB. Mining Inf. Anal. Bull. 2024;(11−1):201—221. [In Russ]. DOI: 10.25018/0236_1493_2024_111_0_201.

Myatezh S. V.¹, Cand. Sci. (Eng.), associate professor, e-mail: myatezh@corp.nstu.ru, ORCID ID: 0000−0001−8450−4027;
Lisitsyn P. S.¹, assistant, e-mail: nik-nokia@mail.ru;
Kravchenko D. P.¹, assistant, e-mail: kradap@gmail.com;
Malozyomov B. V.¹, Cand. Sci. (Eng.), Associate Professor, e-mail: mbv5@mail.ru; Scopus AuthorID: 10239844500 ResearcherID: J-1723−2016 RISC AutorId: 176629 ORCID: 0000−0001−8686−9556;
Chernov A. A.¹, junior researcher of the research unit, e-mail: al-exxe-y@mail.ru;
¹ Novosibirsk State Technical University, 630073, Novosibirsk, Russia.

Myatezh S. V., e-mail: myatezh@corp.nstu.ru.

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