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The influence of personal computer processing modes on line current harmonics

Moore, P.J. and Portugues, I. (2003) The influence of personal computer processing modes on line current harmonics. IEEE Transactions on Power Delivery, 18 (4). pp. 1363-1368. ISSN 0885-8977

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Abstract

The influence of the personal computer processing mode on the generation of line current harmonics has been investigated using a university library building containing over 370 PCs. The harmonics were monitored from the building switchboard using purpose-designed hardware. The PCs were set to execute four types of processing mode: idle, numerical processing, floppy, and hard disk accesses. The results recorded were indicative of harmonics caused by the PC box only, and secondary effects of harmonic production caused by distorted supply voltages were avoided. The results show that hard disk accesses cause the highest level of harmonic production affecting the 3rd and 5th components. Harmonic attenuation was very apparent when comparing the results between a single PC and 124 PCs connected to the same supply phase. However, attenuation and diversity effects due to changes in loading level on the PC power supply were not as predicted, showing an increase in harmonic generation with line current RMS level.

Item type: Article
ID code: 3576
Keywords: computer power supplies, microcomputers, power supply, power system harmonics, power systems, Electrical engineering. Electronics Nuclear engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 12 Jun 2007
    Last modified: 06 Dec 2013 16:45
    URI: http://strathprints.strath.ac.uk/id/eprint/3576

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