NDLI: One year operation of a 9 kW HVDC UPS 350 v at Gnesta municipality data center

Content Provider	IEEE Xplore Digital Library
Author	Akerlund, J. Boije af Gennas, C. Ohlsson, G. Rosin, D.
Copyright Year	2007
Description	Author affiliation: Netpower Labs AB, Lidingo (Akerlund, J.; Boije af Gennas, C.)
Abstract	The municipality of Gnesta, Sweden will in the future offer triple-play internet broadband services to its inhabitants. In the past the IT Service Department of Gnesta used small AC UPS of different ages to cope with the need for uninterruptible power backup at the data centre to match the reliability of telecommunications. Battery maintenance became a burden and they also found that this solution gave little or negligible back-up time. The IT-management of the Gnesta Municipality decided to try the HVDC UPS concept which seemed to promise superior transient protection, energy savings, reliability, power quality and economy. This paper describes one year of trial and full operation of a 350 V DC uninterruptible power system, which may very well be the world's first in critical operation. The paper also describes the HVDC UPS system, designed by Netpower Labs AB and used at the Gnesta municipality. As the first commercial system it meets the ETSI standard EN 300 132-3. Since there currently are very few types of servers and data equipment specifically designed for direct operation from HVDC (350 V DC) Netpower has explored the possibility to use standard equipment and run them on HVDC as an intermediate step. Netpower has performed a study on various existing power supplies for data servers and other computer equipment to check their compatibility with the HVDC concept. The energy savings potential of 30 % made possible by HVDC UPS (compared to present AC UPS) is discussed in the paper. The conclusion is that a HVDC UPS 350 V gives superior transient protection, great energy savings and has potential for future enhanced data centre energy savings as well as it offers very high reliability and good economy.
Starting Page	40
Ending Page	45
File Size	263286
Page Count	6
File Format	PDF
ISBN	9781424416271
DOI	10.1109/INTLEC.2007.4448734
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-30
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	HVDC transmission Uninterruptible power systems Power system transients Web and internet services Batteries Maintenance Power system protection Power system reliability Power quality Telecommunication standards
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
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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