ISSN (print) 1995-2732
ISSN (online) 2412-9003

 

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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.

 

Aleksandr A. Nikolaev – Ph.D. (Eng.), Head of the Department of Automated Electric Drive and Mechatronics Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID: orcid.org/0000-0001-5014-4852

Jean Jacques Rousseau – Professor of the Department of Electrical Engineering and Industrial Informatics Institute of Technology. Jean Monnet University, Saint Etienne, France. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Vincent Szymanski – Lecturer of the Department of Electrical Engineering and Industrial Informatics Institute of Technology. Jean Monnet University, Saint Etienne, France. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Platon G. Tulupov – Master’s student of the Department of Automated Electric Drives and Mechatronics Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

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