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8
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vol 63 / August, 2020
Article

DOI 10.17586/0021-3454-2018-61-12-1052-1059

UDC 621.341.572

FEATURES OF USING MULTILEVEL INVERTERS IN PRECISION SERVO SYSTEMS

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


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


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


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Abstract. The expediency of application of multilevel inverters in systems of the precision servo drive, caused by the increased requirements to reliability, accuracy, a range of regulation of speed and the moment, and energy efficiency of similar systems is considered. The advantages and disadvantages of the main topolo-gies of multilevel inverters are studied, results of mathematical modeling obtained in MatLab/Simulink are analyzed. To compare the harmonic composition of the current formed by different transducer topologies, it is proposed to use the coefficient of variation of the generalized stator current vector. The use of multi-level topologies of voltage inverters allows to expand the range of output voltage regulation, to reduce the influence of dead time, to use keys designed for lower operating voltage, as well as to improve the harmonic composition of the generated current, which directly affects the reduction of electromagnetic moment pulsations. Based on the research results, it is concluded that the use of multi-level inverters in precision electric drive systems has advantages over the use of traditional two-level topologies.
Keywords: multilevel voltage inverters, current pulsations, modulation algorithms, switching losses, instrumental electric drive

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