NDLI: UPS Outage-Mode Output Power Capacity Expansion Approach via Bi-directional Converter

Content Provider	IEEE Xplore Digital Library
Author	Juei-Lung Shyu
Copyright Year	2005
Description	Author affiliation: Department of Electrical Engineering, Kao Yuan University, No.1821, Chung Shan Rd., Lu Chu Hsiang, Kaohsiung County 821, Taiwan, R.O.C., (Phone: +886-7-6077011; Fax: +886-7-6077009; E-mail: jlshyu@cc.kyit.edu.tw) (Juei-Lung Shyu)
Abstract	An outage-mode output power capacity expansion approach of uninterruptible power supplies (UPS's) with full utilization of the existing components is proposed in this paper. The proposed UPS system consists of a bi-directional AC/DC converter and a voltage controlled inverter (VCI). When the utility is normal, the bi-directional converter acts a power factor correction (PFC) rectifier to let the line current with low harmonics and near unity power factor. On the other hand, when the utility fails the bi-directional AC/DC converter can also function as a current controlled inverter (CCI) and is connected in parallel to the VCI. With such instantaneous current sharing controller technique, the load current is equally shared by each inverter with fast response. When compared with conventional UPS's, the proposed built-in parallel technique possesses the advantages of low implementation cost, high power density, fast response, and precise current regulation. Finally, simulation results with different operation modes have demonstrated the feasibility of the proposed UPS system.
Starting Page	1497
Ending Page	1502
File Size	962767
Page Count	6
File Format	PDF
ISBN	0780392965
DOI	10.1109/PEDS.2005.1619925
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-11-28
Publisher Place	Malaysia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Uninterruptible power systems Power generation Bidirectional control Inverters DC-DC power converters Voltage control Control systems Power factor correction Rectifiers Power system harmonics power factor correction Bi-directional converter uninterruptible power supplies
Content Type	Text
Resource Type	Article

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