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12
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vol 61 / DECEMBER, 2018
Article

DOI 10.17586/0021-3454-2017-60-7-624-634

SPACE VECTOR MODULATION IN MULTILEVEL INVERTERS OF THE SERVO DRIVES OF THE TRAJECTORY MEASUREMENTS TELESCOPES

V. S. Tomasov
Saint-Petersburg State University of Information Technologies, Mechanics and Optics; Associate professor, Department head


A. A. Usoltsev
ITMO University, Department of Electrotechnics and Precision Electromechanical Systems; Associate Professor


D. A. Vertegel
ITMO University, Department of Electrotechnics and Precision Electromechanical Systems; Student


R. Strzelecki
Electrotechnical Institute, Warsaw;


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Abstract. Using the MatLab/Simulink mathematical model of a three-phase three-level voltage inverter, the influence of the space-vector modulation (SVM) algorithm on the pulsations of the current (torque) of an AC motor in the range of low rotation speeds is considered. It is shown that the SVM of the second kind does not provide a pulsations level comparable to the pulsations of a sinusoidal pulse-width modulation (SPWM), both in the static mode of the drive operation and in transient modes. In such case, the current pulsations cannot be reduced by changing the modulation algorithm, which almost excludes the possibility of using such transducers in high-quality adjustable instrumental AC electric drives. At the same time, SVM of the first kind can be considered as an alternative to SPWM, as it allows to reduce the current pulsations in the largest part of the control range to a comparable level, and in the last quarter of the control range to values significantly lower than with the SPWM. The asymmetry of the inverter characteristics with the SVM is noted for different directions of the modulation vector rotation.
Keywords: three-level voltage inverter, space-vector modulation, sinusoidal pulsewidth modulation, modulation algorithms, current pulsations, instrumental electric drive

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