NDLI: Input Current Interharmonics of Variable-Speed Drives due to Motor Current Imbalance

Content Provider	IEEE Xplore Digital Library
Author	Basic, D.
Copyright Year	1986
Abstract	This paper presents theoretical, simulation, and experimental investigations of input current interharmonics in modern variable-speed drives based on voltage source inverters and diode input rectifiers that are caused by motor current imbalance. It investigates how a disturbance in the inverter dc side current created by unbalanced motor currents propagates from the inverter to the rectifier stage and appears as variable frequency interharmonic distortion in the rectifier input currents. Particular emphasis is given to theoretical analysis of the frequency transformations created by the inverter and rectifier stages and the magnification of the disturbance current caused by parallel resonance in the drive dc bus circuit. The theoretical results are confirmed by simulation and experimental results. They demonstrate that motor current imbalance can be responsible for high non-characteristic inter-harmonic distortion in the drive input currents. A calculation example outlines a procedure for estimation of the drive input current interharmonic distortion based on measurements of the motor currents. The paper should be helpful for people investigating the origin of problems caused by variable frequency interharmonic currents.
Sponsorship	IEEE Power Engineering Society
Starting Page	2797
Ending Page	2806
Page Count	10
File Size	2195916
File Format	PDF
ISSN	08858977
Volume Number	25
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inverters Rectifiers Frequency Drives Voltage Diodes DC motors Resonance RLC circuits Circuit simulation voltage-source inverter Harmonic transfer imbalance interharmonics power quality (PQ) switching function
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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