NDLI: An online UPS with improved input-output characteristics

Content Provider	IEEE Xplore Digital Library
Author	Joos, G. Lin, Y. Ziogas, P.D. Lindsay, I.F.
Copyright Year	1992
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada (Joos, G.; Lin, Y.; Ziogas, P.D.; Lindsay, I.F.)
Abstract	Standard uninterruptible power supply (UPS) systems are connected in series between the AC mains and the critical load. A phase-controlled rectifier feeds a battery-supported DC bus and an inverter supplies the load. These systems require two conversion stages. Input power factor is poor and large harmonic currents are injected into the AC mains. A topology is proposed which overcomes these drawbacks by placing the inverter-battery subsystem in shunt between the AC mains and the load. The battery is charged by the inverter DC bus. In normal operation, the AC mains feed the load directly, and the inverter supplies only a small amount of reactive power required to maintain the power factor very close to unity and to regulate the load voltage. The system has the following advantages: a near unity power factor, reduced line current harmonics and higher efficiency. The operation of the proposed topology and design considerations are analyzed, and operating characteristics are verified.<>
Starting Page	598
Ending Page	605
File Size	371132
Page Count	8
File Format	PDF
ISBN	0780304853
DOI	10.1109/APEC.1992.228356
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-02-23
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Uninterruptible power systems Pulse width modulation inverters Reactive power Voltage Power harmonic filters Batteries Rectifiers Power system harmonics Inductors Power supplies
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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