Browse > Article
http://dx.doi.org/10.6113/TKPE.2012.17.1.27

Comparative Study on AC and DC Feed System for Internet Data Center  

Kim, Du-Hwan (Dept. of Electrical, Electronic and Control Eng., Konju University)
Kim, Hyo-Sung (Div. of Electrical, Electronic and Control Eng., Konju University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.17, no.1, 2012 , pp. 27-33 More about this Journal
Abstract
Internet Data Centers (IDC), as essential facilities for modern IT industry, typically have scores of MW of concentrated electric loads. Uninterruptible Power Supplies (UPS) are necessary for the power feed system of IDCs because of stable power requirement. Thus, conventional AC power feed systems of IDCs have three cascaded power conversion stages such as (AC-DC), (DC-AC), and (AC-DC), which results in very low conversion efficiency. On the contrary, DC power feed systems need just a single power conversion stage (AC-DC) supplying AC mains power to DC server loads, which gives comparatively high conversion efficiency and reliability. This paper compares the efficiencies between 220V AC power feed system and 300V DC power feed system on equal load conditions which were established in Mok-Dong IDC of Korea Telecom company (KT). Experimental results show that the total operation efficiency of the 300V DC power feed system is around 15% higher than that of the 220V AC power feed system.
Keywords
Internet Data Center; Uninterruptible Power Supply; DC feed system; Efficiency;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 C.W.Gellings, M.Samotyj, "Electric Infrastructure to Power a Digital Society", IEEE Power Engineering Reciew, pp. 15-17, 2002, January.
2 그린인프라와 그린웨어 기반의 차세대 IDC 테스트베드 구축, 2010년 지식경제부 그린/클라우드 컴퓨팅 R&D 성과 발표회, 2010년 11월.
3 Pratt, A, Kumar, P, Aldridge, T.V., "Evaluation of 400V DC distribution in telo and data centers to inprove energy efficiency", INTELEC 2007, pp. 32-39, 2007, Oct. 4.
4 Giovanna Postiglione, DC Distribution System for Home and Offive, Master thesis on Department of Electric Power Engineering, Gothenburg, Sweden, 2001.
5 김효성, "직류(DC)배전과 회로차단기술", 전력전자학회 학회지, 제15권, 제5호, pp. 40-46, 2010.   과학기술학회마을
6 John Humphreys, Jessica Yang, "Server lnnovations: Examining DC Power as an Alternative for Increasing Data Center Efficiency and Reliability," IDC White Paper, pp. 1-7, 2004, IDC
7 김만고, "[특집:통신용 전원기술] 통신용 직류전원 시스템", 전력전자학회 학회지, 제4권, 제5호, pp. 9-16, 1999.   과학기술학회마을
8 N.Rasmussen, "Electrical Efficiency Modeling of Data Centers," APC White Paper #113, Revision 1, http://www.apcmedia.com/salestools/NRAN-66CK3D_R1_ EN.pdf.