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Adjustable-speed drives are the type of equipment most sensitive to voltage sags. This paper analyzes the behavior of three-phase AC adjustable-speed drives during balanced and unbalanced sags. Emphasis is placed on the DC-bus voltage and on the drop in speed, both assuming that the drive will not trip. By using a previously introduced classification of three-phase unbalanced sags, voltage-tolerance curves are obtained for AC adjustable-speed drives. The conclusion from the analysis is that voltage sags due to three-phase faults are a serious problem for adjustable-speed drives. However, single-phase and phase-to-phase faults, causing the majority of voltage sags, can be tolerated by adding a relatively small amount of DC-bus capacitance
Published in:
Industry Applications, IEEE Transactions on
(Volume:36
,
Issue:
3
)
Date of Publication: May/Jun 2000
- Page(s):
- 904 - 910
- ISSN :
- 0093-9994
- INSPEC Accession Number:
- 6619181
- Digital Object Identifier :
- 10.1109/28.845069
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- May/Jun 2000
- Sponsored by :
- IEEE Industry Applications Society
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