Journals →  Gornyi Zhurnal →  2021 →  #7 →  Back

ArticleName Power quality in coal longwalls
DOI 10.17580/gzh.2021.07.14
ArticleAuthor Babokin G. I., Shevyrev Yu. V., Shevyreva N. Yu.

NUST MISIS, Moscow, Russia:

G. I. Babokin, Doctor of Engineering Sciences
Yu. V. Shevyrev, Professor, Doctor of Engineering Sciences,


Gubkin Russian State University of Oil and Gas (National Research University), Moscow, Russia:
N. Yu. Shevyreva, Senior Lecturer, Candidate of Engineering Sciences


Improvement of productivity and performance of coal longwalls is achieved by transition to extended lengths of longwalls up to 250–400 m at unavoidable increase in installed capacity of longwall mining machinery up to 4200–5600 kW. Advanced longwall equipment has variable frequency electric drives. Frequency converters essentially distort sine voltage in power supply networks. One of the facilities capable to improve power quality in supply systems with electric drives with semiconductor converters is passive harmonic filter (PHF). The PHF selection criteria are the low cost, simplicity and reliability. It is recommended to use the simplest PHF—capacitors with antiresonance reactors given they ensure the required-level ultraharmonics. The PHF facility design for underground mine power networks should take into account: specification of power supply diagram, cross-effect of frequency converters in adjacent lines, variability of loading, and change in number of concurrently operating frequency converters. To this effect, the power supply model is developed to analyze quality of input electric energy. This model includes topology of electric mains, parallel converters and actual drive loads. The modeling analysis was performed in two stages. First, the influence patterns of frequency converters on power quality without PHF were examined. Second, the influence patterns of frequency converters on power quality in the presence of PHF were studied. The research shows that the total harmonic factor of voltage in each line is affected by the converters in adjacent lines. Thus, it is necessary to take into account the frequency converters arranged in adjacent lines when selecting PHF.

keywords Longwall, fully mechanized longwall mining system, adjustable frequency electric drives, voltage harmonics, total factor, voltage distortion, passive harmonic filter, modeling

1. Efimov V. I., Khmelinskiy A. A., Mefodev S. N. Modern approaches to configuration of longwall equipment for coal mining on flat seams. Ugol. 2019. No. 6. pp. 36–40.
2. Meshkov A. A., Volkov M. A., Ordin A. A., Timoshenko A. M., Botvenko D. V. On record length and productivity of highwall mining the V.D. Yalevsky mine. Ugol. 2018. No. 7. pp. 4–7.
3. Babokin G. I. Influence of process flow diagram and longwall length on specific energy consumption of shearers. GIAB. 2021. No. 2 . pp. 139–149.
4. Boykov I. L., Shestakov V. V., Zaklika M., Ulrikh Kh. Practice of introduction of frequency converters in shearer drives : A case-study of Vorgashor mine, Glückauf. 2010. No. 1. pp. 79–83.
5. Tkachenko A. A., Osichev A. V. Models for the dynamic analysis of electric drives in scraper conveyors. Vestnik NTU KhPI. 2013. No. 7. pp. 99–103.
6. Shi Jianguo, Mao Jun, Wei Xiaohua. Research on Dynamic Tension Control Theory for Heavy Scraper Conveyor. Applied Mechanics and Materials. 2010. Vol. 34-35. pp. 1956–1960.
7. Stecuła K., Brodny J., Tutak M. Informatics platform as a tool supporting research regarding the effectiveness of the mining machines’ work. CBU International Conference on Innovations in Science and Education. Prague, 2017. Vol. 5. pp. 1215–1219.
8. Ning Wang, Zongguo Wen, Mingqi Liu, Jie Guo. Constructing an energy efficiency benchmarking system for coal production. Applied Energy. 2016. Vol. 169. pp. 301–308.
9. Wahl A. Kamat : High pressure pumps for longwalls. Gornaya promyshlennost. 2016. No. 3. pp. 30–34.
10. Egorov A. N., Semenov A. S., Kharitonov Ya. S., Fedorov O. V. Efficiency of variable frequency drive in diamond mining. Gornyi Zhurnal. 2019. No. 2. pp. 77–82. DOI: 10.17580/gzh.2019.02.16
11. Dewang Feng, Mi Lu, Jianrong Lan, Lei Sun. Research on switching operation transient electromagnetic environment of substations in a coal mine. IET Generation, Transmission & Distribution. 2016. Vol. 10, Iss. 13. pp. 3322–3329.
12. Naderi Y., Hosseini S. H., Zadeh S. G., Mohammadi-Ivatloo B., Vasquez J. C., Guerrero J. M. An overview of power quality enhancement techniques applied to distributed generation in electrical distribution networks. Renewable and Susta inable Energy Reviews. 2018. Vol. 93. pp. 201–214.
13. Zhezhelen ko I. V., Shidlovskiy A. K., Pivnyak G. G., Saenko Yu. L., Noyberger N. A. Electromagnetic compatibility of consumers. Moscow : Mashinostroenie, 2012. 349 p.
14. Ershov M. S., Egorov A. V., Trifonov A. A. Sustainability of industrial electric systems. Moscow : Nedra, 2010. 319 p.
15. GOST 32144–2013. Electric energy. Electromagnetic compatibility of technical equipment. Power quality limits in the public power supply systems. Moscow : Standartinform, 2014. 20 p.
16. Dobrusin L. A. Harmonic filters for converter installations. Moscow : Energoprogress, 2003. 84 p.
17. Yushkov A. Matched and unmatched filters and components Electronicon. Komponenty i tekhnologii. 2006. No. 4(57). pp. 128–132.

Language of full-text russian
Full content Buy