ISSN 0021-3454 (print version)
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9
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vol 63 / September, 2020
Article

DOI 10.17586/0021-3454-2020-63-7-600-610

UDC 621.341.572

PRECISION ELECTRIC DRIVE BASED ON THE MULTI-PHASE INVERTER WITH SPACE-VECTOR MODULATION

D. A. Vertegel
ITMO University, Saint Petersburg, 197101, Russian Federation; postgraduate


A. A. Usoltsev
ITMO University, Saint Petersburg, 197101, Russian Federation; Associate Professor


V. S. Tomasov
ITMO University, Saint Petersburg, 197101, Russian Federation; Associate professor, Director of Research and Production Center "Precision Electromechanics"


Abstract. The problem of improving precision electric drives quality by minimization of the stator current pulsations generated by frequency inverter is discussed. The problem can be solved by using multi-phase inverters, as well as by improving the control algorithms. The influence of space-vector modula-tion algorithm on pulsations of stator current generated by a five-phase voltage inverter for various se-quences of basic vectors formation is considered. Changing the sequence of base vectors is shown to have a significant effect on the level of generated stator current pulsations. Two possible approaches to implementation of the space-vector modulation in the five-phase electric drives are presented, and com-parative analysis of the approaches with and without considering the dead time, is carried out. Results of modeling are presented, confirming that minimizing the number of commutations per modulation period with deep control of the electric drive speed has a significant impact not only on the level of the stator current pulsations, but also on the compensation of the current vector in the second plane of the base vectors, which can cause overheating and subsequent failure of the electric motor.
Keywords: multiphase electric drive, space-vector modulation, coefficient of variation, precision electric drive, frequency converters

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