Gubkin National Research University of Oil and Gas, Moscow, Russia

N. Yu. Shevyreva, Candidate of Engineering Sciences, Associate Professor, nshev90@yandex.ru

NUST MISIS, Moscow, Russia
Yu. V. Shevyrev, Doctor of Engineering Sciences, Professor, Associate Professor

Large-scale application of variable frequency electric drives in power supply systems in mines is accompanied with the worsening of energy quality. One of the methods to improve energy quality in power networks with low voltages to 1 kV and wattage to 1 MW can be the addition of frequency converters with active voltage rectifiers. Two-level rectifiers improve power quality; on the other hand, in case of low-power networks, the total harmonic content and voltage fluctuations may exceed standard values. This will require additional power quality control. In this case, it is expedient to change the two-level to three-level active rectifiers with the clamped neutral point. This study analyzes influence exerted on the voltage waveform and value in a power supply system by a frequency converter with a three-level active rectifier. The results on the influence of the three-level active rectifier on the power quality with and without a harmonic filter in the rectifier are described. For the maintenance of a preset voltage irrespective of the supply main and the motor load, it is proposed to use automatic voltage adjustment with the help of the negative voltage feedback. The test data on operation of the two-level and three-level rectifiers in case of the low-power supply are compared. It is shown that the three-level active rectifier is an effective tool to improve voltage waveform and ensure allowable voltage fluctuations in case of the low-power supply of the variable frequency electric drives.

1. Abramov B. I., Kogan A. I., Breslav B. M., Kochetkov V. D., Kozhakov O. I. et al. Variablefrequency electric drive for drilling rigs BU4200/25. Russian Electrical Engineering. 2009. Vol. 80, No. 1. pp. 6–9.
2. Semenov A. S., Bebikhov Yu. V., Egorov A. N., Fedorov O. V. Effect of higher harmonics on electric power quality in supply systems in mines. Gornyi Zhurnal. 2024. No. 2. pp. 84–91.
3. Karpenko S. M., Karpenko N. V., Ematin E. A., Abelyants U. V. Statistical analysis and predictive modelling of electric power consumption of excavators and sites of a coal strip mine. Ugol. 2024. No. 3. pp. 79–86.
4. Karpenko S. M., Karpenko N. V., Bezginov G. Yu. Forecasting of power consumption at mining enterprises using statistical methods. Gornaya Promyshlennost. 2022. No. 1. pp. 82–88.
5. Osipov O. I., Ivanov A. G., Ignatev P. S., Gusev A. V. Asynchronous low-speed drive of a mine hoisting machine. Proceedings of the 8^th International (19^th All-Russian) Conference on Automatic Electric Drive–2014. Saransk : Izdatelstvo Mordovskogo universiteta, 2014. Vol. 2. pp. 367–369.
6. Panda A., Dyanamina G., Singh R. K. MATLAB simulation of space vector pulse width modulation for 3-level NPC inverter and 2-level inverter. 2021 International Conference on Sustainable Energy and Future Electric Transportation. Hyderabad, 2021. DOI: 10.1109/sefet48154.2021.93756
7. Mattoo B. A., Bhat A. H. Comparative analysis of various PWM techniques for voltage source inverter. 2022 1^st International Conference on Sustainable Technology for Power and Energy Systems. Srinagar, 2022. DOI: 10.1109/STPES54845.2022.10006650
8. Vinogradov A. B. Vector Control of AC Electric Drive. Ivanovo, 2008. 298 p.
9. Efimov A. A., Shreyner R. T. Active Converters in Controllable AC Drives. Novouralsk : NGTI, 2001. 250 p.
10. Shreyner R. T. Mathematical Modeling of AC Drives with Semi-Conductor Frequency Converters. Yekaterinburg : UrO RAN, 2000. 654 p.
11. Lingom P. M., Song-Manguelle J., Unruh R., Nyobe-Yome J. M., Doumbia M. L. Performance evaluation of multi-modulation single-carrier PWM methods for motor drive applications. 2023 IEEE 14^th International Conference on Power Electronics and Drive Systems. Montreal, 2023. DOI: 10.1109/PEDS57185.2023.10246565
12. Markowska K., Zhuk D., Zhuk O., Kozlov O., Stepenko O. et al. Analysis and improvement of power q uality in the onboard electrical power systems within a self-propelled floating crane. International Journal of Electrical Power and Energy Systems. 2024. Vol. 161. ID 110179.
13. Perez M. A., Ceballos S., Konstantinou G., Pou J., Aguilera R. P. Modular multilevel converters: Recent achievements and challenges. IEEE Open Journal of the Industrial Electronics Society. 2021. Vol. 2. pp. 224–239.
14. Shevyreva N. Yu., Shevyrev Yu. V., Bobokin G. I. The use of frequency converter and active rectifier of voltage for the power quality improvement in coal longwalls. Eurasian Mining. 2022. No. 1. pp. 80–84.
15. GOST 32144–2013 (EN 50160:2010, NEQ). Electric energy. Electromagnetic Compatibility of Technical Equipment. Power Quality Limits in the Public Power Supply Systems. Moscow : Standartinform, 2014. 19 p.
16. Makarov V. G., Khaybrakhmanov R. N. Multilevel voltage inverters. Topology and application. Vestnik tekhnologicheskogo universiteta. 2016. Vol. 19, No. 22. pp. 134–138.
17. Nikolaev A. A., Bulanov M. V., Maklakov A. S., Gilemov I. G. Development and study of improved PWM algorithms of active rectifiers to achieve power quality in intra-factory electrical networks 6–35 kV. Vestnik Ivanovskogo gosudarstvennogo energeticheskogo universiteta. 2023. No. 6. pp. 69–81.
18. Shevyrev Yu. V., Shevyreva N. Yu. Improvement of voltage waveform in power supply systems with dynamic rectifier in mineral mining and processing industry. Gornyi Zhurnal. 2019. No. 1. pp. 66–69.
19. Shevyreva N. Yu. Simulation of frequency controlled electric drive with active front end. Glavnyi energetik. 2015. No. 8. pp. 69–74.