High-Power Induction Motors Supplied with Voltage Containing Subharmonics

In some power networks, components of frequency less than the frequency of the fundamental voltage harmonic called subharmonics or subsynchronous interharmonics occur. In this paper, the effect of voltage subharmonics on currents, power losses, speed fluctuations and electromagnetic torque is examin...

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Bibliographic Details
Published in:Energies (Basel) 2020-11, Vol.13 (22), p.5894
Main Authors: Gnaciński, Piotr, Klimczak, Piotr
Format: Article
Language:English
Subjects:
Electric potential
Electromagnetic induction
Finite element analysis
Induction motors
Interharmonics
Load
power losses
power quality
power system
Powertrain
Resonant frequencies
subharmonics
Torque
Torsional vibration
Vibration
Voltage
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Summary:In some power networks, components of frequency less than the frequency of the fundamental voltage harmonic called subharmonics or subsynchronous interharmonics occur. In this paper, the effect of voltage subharmonics on currents, power losses, speed fluctuations and electromagnetic torque is examined. The results of numerical computations using the finite element method for an induction cage motor of rated power of 5.6 MW and four motors of rated power of 200 kW with different numbers of poles are presented. An extraordinary harmful effect on high-power induction motors is demonstrated. Among other effects, voltage subharmonics cause significant torque pulsations whose frequencies may correspond to the elastic-mode natural frequency. Possible resonance can result in excessive torsional vibration and the destruction of a power train.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13225894