Indices for measurement of harmonic distortion in power systems according to IEC 61000‐4‐7 standard. Issue 14 (1st November 2015)

• Record Type: Journal Article
• Authors: Dalali, Milad; Jalilian, Alireza
• Is Part Of: IET generation, transmission & distribution. Volume 9:Issue 14(2015)
• Page Start: 1903
• Page End: 1912
• Publication Date: 2015-11-01
• Subjects: IEC standards -- harmonic distortion -- power system harmonics; harmonic distortion measurement -- power systems -- IEC 61000‐4‐7 standard -- total harmonic distortion -- interharmonic pollution analysis -- interharmonic components -- THDG index -- waveform decomposition methods -- IEC indices -- waveform distortion; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2015.0366
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Among harmonic distortion indices presented in International Electrotechnical Commission (IET) standard 61000‐4‐7, only group total harmonic distortion (THDG) can be used for interharmonic pollution analysis. However, existence of interharmonic components around of fundamental frequency may deteriorate accuracy of this index. To solve this problem, two virtual groups according to IEC standard are defined in this study. Then, two new distortion indices are proposed by using virtual groups in equation of THDG index. The new distortion indices are named as: group and subgroup total harmonic distortion and improved THDG. On the basis of various simulation tests and usage of different waveform decomposition methods, it is shown that proposed indices can better show the amount of waveform distortion caused by interharmonics in respect to IEC indices.