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Abstract

AC regenerative drives are widely used in metallurgical rolling because of their reliability, economy and high efficiency to maintain the process.This article presents an overview of the latest achievements in the field of power connection circuits for electric drives to the power network. The article discusses multipulse connection schemes based on various types of transformers, algorithms for pre-programmed pulse-width modulation with the selected harmonic elimination method of three-level active front-end rectifiers. It provides the results of practical measurements.The results of experimental studies were obtained in the distribution power network of the metallurgical plant CherMK "Sever-Stal", which includes powerful electric drives for cold rolling mill stands based on frequency converters with active front-end rectifiers. Both frequency converters have the same power - 14 MW. One frequency converter is implemented according to a 6-pulse scheme, and the other according to a 12-pulse one. The instantaneous values of the phase current of the current transformers were recorded using a portable Flash Recorder and a Fluke 43B current clamp. The sampling frequency of the recorded signals was 30 kHz. The phase grid currentwareforms and spectrums at 6- and 12-pulse circuits are shown and the total harmonic distortion up to the 60th and 150th harmonics are calculated for different pre-programmed pulse-width modulation patterns. It is expected that this article can give a new overview of the multipulse schemes for main regenerative AC drive connections of rolling mill stands to identify modern solutions and to improve significantly their electromagnetic compatibility with the power supply system. The presented results can be used by researchers and engineers to ensure the electromagnetic compatibility of non-linear consumers in similar circuits.

Keywords

Power converters, electric drive, pulse-width modulation, voltage quality, multipulse connection schemes.

Alexander S. Maklakov

Ph.D. (Engineering), Associate Professor, Senior Researcher, Research and Innovation Services, South Ural State University, Chelyabinsk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0001-7950-708X

Alexander A. Nikolaev

Ph.D. (Engineering), Associate Professor, Head of the Department, Department of Automated Electric Drive and Mechatronics, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0001-5014-4852

Andrey A. Radionov

D.Sc. (Engineering), Professor, Department of Automation and Control, Moscow Polytechnic University, Nosov Magnitogorsk State Technical University, Moscow, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0002-3914-4429

Vadim R. Gasiyarov

D.Sc. (Engineering), Associate Professor, Professor, Department of Automation and Control, Moscow Polytechnic University, Master’s Degree Student, Automated Control Systems Department, Nosov Magnitogorsk State University, Moscow, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0001-9635-4716

Ildar G. Gilemov

Postgraduate student, Department of Automated Electric Drive and Mechatronics, Nosov Magnitogorsk State University, Magnitogorsk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0002-2481-3378

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