Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

G. P. Kornilov, Head of a Chair, Professor, Doctor of Engineering Sciences, korn_mgn@mail.ru
I. R. Abdulveleev, Associate Professor, Candidate of Engineering Sciences
Yu. N. Kondrashova, Associate Professor, Candidate of Engineering Sciences
K. E. Odintsov, Associate Professor, Candidate of Engineering Sciences

The article discusses power supply quality in an industry in terms of Mikheevsky GOK—one the largest mining and processing plants in the Chelyabinsk Region and in Russia. The power supply quality is understood here as the reliability, economic efficiency and electromagnetic compatibility of basic power consumers. These objectives can be successively achieved through in-house power generation by gas piston power plants, as well as thanks to banks of supercapacitors capable to maintain power factor within the present ranges. The capital expenses connected with buying mill electric drives with capacity to tens megawatts are appreciably cut down owing to an original decision to use asynchronous motors with phase-wound rotors and liquid rheostats, which were commonly used at the dawn of adjustable electric drives. That decision allowed rejecting expensive variable speed drives at admissible power quality. Design and installation of capacitors with current-limiting coils neglected harmonics of lowvoltage variable speed drives and follow-up resonances, which resulted in overcurrents and in failure of the capacitors. Finally, the plant sustained considerable losses. The way out of this situation is shown by the research and modeling as series connection of currentlimiting coils and filters set to suppress outer lowest harmonics (5, 7, 11) in the canonical series. The economic effect and payback period of the implementation of the proposed solution are governed, first, by the extended failure-free operation of capacitors due to elimination of overcurrents and reduction in energy loss in wattless power flows and, second, by zero extra expenses connected with installation of filter-equipped coils.
The study was supported by the President of the Russian Federation, Grant for Young Candidates of Sciences—MK-499.2020.8.

1. Altushkin I. A., Levin V. V., Gordeev A. I., Pikalov V. A. Development of the Tominsk and Mikheevsk copper ore deposits of the Southern Urals. Tsvetnye Metally. 2019. No. 7. pp. 21–28. DOI: 10.17580/tsm.2019.07.02
2. Tuchina M. V., Ermakova Yu. V. Reserve sufficiency of South and Middle Urals copper mines, their mineral base status and prospects. Rudy i metally. 2019. No. 3. pp. 12–21.
3. Altushkin I. A., Levin V. V., Sizikov A. V., Korol Yu. A. Experience of development of porphyry copper type deposits in the Urals. Journal of Mining Institute. 2017. Vol. 228. pp. 641–648.
4. Gordeev S. S. Growth points and new trend of industrial development of Ural. Sotsium i vlast. 2017. No. 5(67). pp. 74–82.
5. Altushkin I. A., Korol Yu. A., Cherepovitsin A. E. Economic evaluation of innovative solutions of a project development of Miheevskiy copper porphirite ores deposit. Gornyi Zhurnal. 2012. No. 8. pp. 113–116.
6. Yaghoobi J., Abdullah A., Kumar D., Zare F., Soltani H. Power Quality Issues of Distorted and Weak Distribution Networks in Mining Industry: A Review. IEEE Access. 2019. Vol. 7. pp. 162500–162518.
7. Jasiński M., Borkowski K., Sikorski T., Kostyła P. Cluster analysis for long-term power quality data in mining electrical power network. 2018 Progress in Applied Electrical Engineering. Koscielisko, 2018. pp. 14–19.
8. Rodríguez J. R., Pontt J., Newman P., Musalem R., Miranda H. et al. Technical evaluation and practical experience of high-power grinding mill drives in mining applications. IEEE Transactions on Industry Applications. 2005. Vol. 41, No. 3. pp. 866–874.
9. Van de Vijfeijken M., Filidore A., Walbert M., Marks A. Copper Mountain: Overview on the Grinding Mills and their Dual Pinion Mill Drives. Proceedings of the SAG 2011 Conference. Vancouver, 2011. pp. 1–20.
10. Francisco Silva G., Luis Morán T., Miguel Torres T., Christian Weishaupt V. A Method to Evaluate Cycloconverters Commutation Robustness Under Voltage and Frequency Variations in Mining Distribution Systems. IEEE Transactions on Industry Applications. 2018. Vol. 54, No. 1. pp. 858–865.
11. Aravena P., Moran L., Melo D., Burgos R., Astudillo P., Olivares C. High Power Cycloconverter for Mining Applications: Practical Recommendations for Operation, Protection and Compensation. 2013 IEEE Industry Applications Society Annual Meeting. Lake Buena Vista, 2013. pp. 943–950.
12. Ferreira V. N., Mendonça G. A., Rocha A. V., Resende R. S., Cardoso Filho B. J. Medium voltage IGBTbased converters in mine hoist systems. 2016 IEEE Industry Applications Society Annual Meeting. Portland, 2016. pp. 852–860.
13. GOST 32144–2013. Electric energy. Electromagnetic compatibility of technical equipment. Power quality limits in the public power supply systems. Moscow : Standartinform, 2014. 19 p.
14. Kornilov G. P., Khramshin T. R., Abdulveleev I. R. Increasing stability of electric drives of rolling mills with active front ends at voltage sag. 2019 International Conference on Electrotechnical Complexes and Systems. Ufa, 2019. DOI: 10.1109/ICOECS46375.2019.8949945
15. Luiz A.-S. A., de Jesus Cardoso Filho B. Improving power quality in mining industries with a threelevel active front end. 2015 IEEE Industry Applications Society Annual Meeting. Addison, 2015. pp. 1133–1142.
16. Morán L., Albistur C. A., Burgos R. Multimega VAR Passive Filters for Mining Applications: Practical Limitations and Technical Considerations. IEEE Transactions on Industry Applications. 2016. Vol. 52, No. 6. pp. 5310–5317.
17. Khramshin T. R., Abdulveleev I. R., Kornilov G. P. Assurance of electromagnetic compatibility of powerful electrotechnical systems. Vestnik Yuzhno-Uralskogo gosudarstvennogo universiteta. Ser. Energetika. 2015. Vol. 15, No. 1. pp. 82–93.
18. Kornilov G. P., Abdulveleev I. R., Kovalenko A. Yu. Improving the reliability of steel producing units electric supply with schematic design solutions. Vestnik Yuzhno-Uralskogo gosudarstvennogo universiteta. Ser. Energetika. 2019. Vol. 19, No. 4. pp. 59–69.
19. Shpiganovich A. A., Fedorov O. V., Pushnitsa K. A., Churkina E. V. Operating features of electric power supply systems at the iron and steel works. Chernye Metally. 2017. No. 5. pp. 56–61.
20. Mohammedsaeed E. K., Karrar A. A. Finite element method based design of a Liquid Rheostat motor starter. 2016 IEEE International Conference on Power Electronics, Drives and Energy Systems. Trivandrum, 2016. DOI: 10.1109/PEDES.2016.7914381
21. Nikolaev A. A., Kornilov G. P., Khramshin T. R. Experimental study of electromagnetic compatibility of modern electric drives used in the power supply system of a metallurgical enterprise. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G. I. Nosova. 2016. Vol. 14, No. 4. pp. 96–105.
22. Zhezhelenko I. V. Highest harmonics in power supply systems in industry. Fourth edition, revised and enlarged. Moscow : Energoatomizdat, 2000. 331 p.