Abstract
Problem Statement (Relevance): The authors conducted a series of experiments aimed at studying the current harmonics of electric arc furnaces (EAF) with different power characteristics and of different types that are functioning at a number of steel making sites across Russia. Objectives: The study aims to provide a comprehensive analysis of the changing electric arc high-order current harmonics, identify the patterns and define the mean and maximal levels of harmonics for each type of furnace. Methods Applied: The research was based on the range of instantaneous current values registered with high-speed multichannel electrical signal recorders. The data processing was realized with the Simulink application, a part of the MATLAB package. The basic coefficients of EAF current harmonics were calculated using the default spectral analysis methods and the developed signal processing algorithms. Findings: The study helped identify the effect of process factors and power equipment parameters on the levels of harmonics at different EAF process stages. The authors came to the conclusion that it is crucial to consider the maximal levels of important harmonics when choosing the parameters of harmonic filters for static var compensators. The authors analysed and compared the change rates of the total root-mean-square values of even harmonics vs. odd harmonics. The comparison helped identify an important trend, which is that the attenuation rate of even harmonics is several times higher compared with the attenuation rate of odd harmonics. The analysis justifies the use of the root-mean-square value of even harmonics for process diagnostics in conventional EAFs. Originality: This is original research as it offers the first comprehensive analysis of the change pattern of high-order current harmonics in a broad range of EAFs, which, apart from conventional electric arc furnaces and classical ladle furnaces, includes furnaces with continuous scrap feed and shaft furnaces with the burden preheating system. Practical Relevance: The research findings offer a great contribution to the field of electrical engineering of arc furnaces and may be useful when designing the parameters of static var compensators which are a part of EAF power supply systems. The patterns identified may also be applied for solving the EAF process diagnostics tasks, as well as for designing advanced EAF power control systems.
Keywords
Electric arc furnace, ladle furnace, current harmonics, eleсtrical power quality, static var compensator, reactive power compensation, high-order harmonics filter, electrode positioning control system, EAF process diagnostics.
1. Nikolaev A.A. Povyshenie ehffektivnosti raboty dugovyh staleplavil'nkyh pechei i ustanovok kovsh-pech' za schet primeneniya usovershenstvovannykh algoritmov upravleniya elektricheskimi rezhimami: monografiya [Improving the performance of electrical arc furnaces and ladle furnaces through the application of advanced power control algorithms: Monograph]. Magnitogorsk: the Publishing House of Nosov Magnitogorsk State Technical University, 2015, 161 р. (In Russ.)
2. Nikolaev A.A., Kornilov G.P., Yakimov I.A. Study of operating modes of electric arc furnaces with static var compensators. Part 1. Elektrometallurgiya. [Electrometallurgy], 2014, no.5, рр. 15–22. (In Russ.)
3. Nikolaev A.A., Kornilov G.P., Tulupov P.G., Povelitsa E.V. Study of different design options of electrode positioning control systems for electric arc furnaces and ladle furnaces. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University], 2015, no. 2, рр. 90–100. (In Russ.)
4. Nikolaev A.A. Kornilov G.P., Anufriev A.V., Pekhterev S.V., Povelitsa E.V. Electrical Optimization of Superpowerful Arc Furnaces. Steel in Translation, 2014, vol. 44, no. 4, pp. 289–2297. doi:10.3103/S0967091214040135
5. Kornilov G.P., Nikolaev A.A., Khramshin T.R., Vakhitov T.Yu., Yakimov I.A. Some features of mathematical modelling of an electric arc furnace as an electrotechnical complex. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University], 2015, no.1, pp. 76–82. (In Russ.)
6. Nikolaev A.A., Kornilov G.P., Khramshin T.R., Akay I., Gok Y. Application of Static Var Compensator of Ultra-High Power Electric Arc Furnace for Voltage Drops Compensation in the Factory Power Supply System of a Metallurgical Enterprise. Proceedings of Electrical Power and Energy Conference (EPEC), Calgary. Canada. IEEE, 2014, pp. 235–41. doi:10.1109/EPEC.2014.18
7. Novoselov N.A. Sovershenstvovanie metodik rascheta pokazateley kachestva electroenergii v sistemakh elektrosnabzhniya s dugovimi staleplavil’nyimi pechami maloy moshnosti. Diss. kand tekhn. nauk [Improvement of electrical power quality calculation methods for power supply systems of low-power electric arc furnaces. PhD Dissertation]. Magnitogorsk, 2012, 166 р. (In Russ.)
8. Zhezhelenko I.V. Vysshie garmoniki v sistemakh elektrosnab-zhenija prompredprijatii [Higher harmonics in industrial power supply systems]. Moscow: Energoatomizdat, 2004, 358 p. (In Russ.)
9. Chang G.W., Liu Y.J., Huang H.M., Chu S.Y. Harmonic Anal-ysis of the Industrial Power System with an AC Electric Arc Furnace. Proceedings of IEEE Power Engineering Society General Meeting. 2016. Montreal. Canada. IEEE, pp. 1–4. doi:10.1109/PES.2006.1709471
10. Ye Xiao-Mei, Liu Xiao-He. The Harmonic Detection based on Wavelet Transform and FFT for Electric Arc Furnaces. Proceedings of International Conference on Wavelet Analysis and Pattern Recognition. Baoding. China. IEEE, 2009, pp. 408–412. doi:10.1109/ICWAPR.2009.5207486
11. Yongning Wang, Heming Li, Boqiang Xu, Liling Sun. Simulation Research of Harmonics in Electric System of Arc Furnace. Proceedings of Power System Technology International Conference. IEEE, 2004, vol. 1, pp. 902–906. doi:10.1109/ICPST.2004.1460122
12. Ahmed E.E., Abdel-Aziz M., El-Zahab E., Xu W. Investigation and Mitigation of Harmonics from Electric Arc Furnaces. Proceedings of Electrical and Computer Engineering Conference. Edmonton. Canada. 1999, vol. 2, pp. 1126–1131. doi:10.1109/CCECE.1999.808213
13. Xiuche L., Guang Y., Wei S. Harmonic Current Detection of Electric Arc Furnace System Based on the Method of Elimi-nating Zero-sequence Component. Proceedings of Intelligent Computation Technology and Automation International Con-ference (ICICTA). Shenzhen. Guangdong. IEEE, 2011, pp. 431–433. doi:10.1109/ICICTA.2011.120
14. Xiuche Lu, Xiuqi Li. The Applications of Wavelet Multi-Resolution Algorithm in Harmonic Current Detection of Electric Arc Furnace Short Net. Proceedings of E-Product E-Service and E-Entertainment International conference (ICEEE). Henan. China. IEEE, 2010, pp. 1–5. doi:10.1109/ICEEE.2010.5661007
15. Uz-Logoglu Eda, Salor Ozgul, Ermis Muammer. Online Characterization of Interharmonics and Harmonics of AC Electric Arc Furnaces by Multiple Synchronous Reference Frame Analysis. IEEE Transactions on Industry Applications, Vol. 52, Iss. 3, pp. 2673–2683. doi:10.1109/TIA.2016.2524455
16. Nikolaev A.A., Tulupov P.G., Anufriev A.V. Assessing the Feasibility of Electrical Mode Control of Ultra-High Power Arc Steelmaking Furnace Based on Data about Harmonic Composition of Arc Currents and Voltages. Proceedings of Research and Education in Mechatronics (REM) 16th International Conference. Bochum. Germany. IEEE, 2015, pp. 301–308. doi:10.1109/REM.2015.7380411
17. Evseeva N.V., Yas'kin V.N., Tokovoy O.K., Volkodaev A.N., Livshitc D.A., Freynd E.A., Chekunov G.M., Kochkin V.N., Zi-nov'ev V.Yu., Rechkalov A.V., Frolov V.G. Sposob opredele-niya stadii plavleniya shihty v dugovoj staleplavil'noi pechi [The method of heating stage diagnostic in an electric arc fur-nace]. Patent RF, no. 2150643, 2000.
18. Arkhipov V.M., Chernov V.A., Shurygin M.K., Kirpichenkov V.P., Isaykin A.N., Savchenko N.A., Krass M.A., Drogin V.I., Kurlykin V.N., Tatarov A.P., Yasinenko A.A. Ustroistvo dlya upravleniya elektricheskim rezhimom dugovoij elektropechi [The device for control of the electrical regime of an electric arc furnace]. Patent RF, no. 2079982, 1997.
19. Svenchanskiy A.D. Elektricheskie promyshlennye pechi. [Industrial Electric Furnaces]. Moscow: Energoizdat, 1981, 296 p.
20. Bowman B., Krüger K. Arc Furnace Physics. Verlag Stahlei-sen GmbH, Düsseldorf, 2009.
21. Özgür Gerçek, Muammer Ermis, Arif Ertas, Kemal Nadir Kose. Design, Implementation, and Operation of a New C-Type 2nd Harmonic Filter for Electric Arc and Ladle Furnaces. Cem. IEEE Transactions on Industry Applications, Vol. 47, Iss. 4, pp. 1545–1557. doi:10.1109/TIA.2011.2155020
22. Nikolaev A.A., Kornilov G.P., Urmanova F.F., Zaytsev A.S., Skakun S.V. The reasoning behind the choice of power for the static var compensator to be used in an electric arc furnace. Glavnyi energetik [Chief electrician]. 2015, no. 8, pp. 49–56. (In Russ.)
23. Ol'shvang M.V., Rychkov E.V., Ananiashvili K.E., Chuprikov V.S. Harmonic filters in static var compensators. Elektrichestvo [Electricity]. 1990, no. 1, pp. 23–29. (In Russ.)