Facility-level DC vs. typical AC distribution for data centers: A comparative reliability study

V. Sithimolada, Peter W Sauer

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper presents a comparative reliability analysis of a dc power distribution system in a range of 400 Vdc at the facility level against a typical ac distribution, for critical datacenter loads. Assumptions and conditions are established to allow meaningful comparisons. Inherent availability and survival function are used as the two reliability metrics. Analytical reliability models for various common configurations are developed, and quantitative results are obtained based on a set of generic reliability data. The study indicates that the dc system would be more reliable than the ac to a certain extent when considering a configuration with multiple units of uninterruptible power supply and loads but without redundancy. However, on a large scale with redundancy, it is shown that the dc would have a similar reliability level to that of the typical ac distribution.

Original languageEnglish (US)
Title of host publicationTENCON 2010 - 2010 IEEE Region 10 Conference
Number of pages6
StatePublished - 2010
Event2010 IEEE Region 10 Conference, TENCON 2010 - Fukuoka, Japan
Duration: Nov 21 2010Nov 24 2010

Publication series

NameIEEE Region 10 Annual International Conference, Proceedings/TENCON


Other2010 IEEE Region 10 Conference, TENCON 2010


  • Critical facilities
  • DC distribution
  • Data centers
  • Reliability

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications


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