Improved processing of harmonics and interharmonics by time-domain averaging

The harmonic and interharmonic analysis recommendations are contained in the latest International Electrotechnical Commission (IEC) standards on power quality. Measurement and analysis experiences have shown that great difficulties arise in the interharmonics detection and measurement with acceptabl...

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Bibliographic Details
Published in:	IEEE transactions on power delivery Vol. 20; no. 4; pp. 2370 - 2380
Main Authors:	Zhongdong Liu, Himmel, J., Bonfig, K.W.
Format:	Journal Article
Language:	English
Published:	New York, NY IEEE 01-10-2005 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Acceptability Applied sciences Difference filter Discrete Fourier transforms Disturbances. Regulation. Protection Electrical engineering. Electrical power engineering Electrical power engineering Error analysis Exact sciences and technology Fourier transforms Frequency conversion frequency converter Frequency synchronization Harmonic analysis Harmonics IEC standards Information, signal and communications theory Interharmonics International Electrotechnical Commission (IEC) standards Power harmonic filters Power networks and lines Power system analysis computing Power system harmonics Signal and communications theory Signal processing Signal, noise Simulation Spectra spectral analysis spectral leakage Telecommunications and information theory Time domain analysis time-domain averaging Waveform Averaging method spectral leakage Discrete Fourier transformation Power system harmonics Harmonic analysis Difference filter International Electrotechnical Commission (IEC) standards interharmonics Spectral analysis Experimental result Time domain method Frequency converter IEC standard Numerical simulation time-domain averaging
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Summary:	The harmonic and interharmonic analysis recommendations are contained in the latest International Electrotechnical Commission (IEC) standards on power quality. Measurement and analysis experiences have shown that great difficulties arise in the interharmonics detection and measurement with acceptable levels of accuracy. In this paper, the spectral leakage problems of the discrete Fourier transform due to synchronization errors of interharmonics are analyzed. The time-domain averaging is investigated for the processing of harmonics in the framework of the IEC standards. A difference filter is proposed to detect interharmonics and can be compatible with the IEC standards. Simulations and the field results show the usefulness of the proposed methods.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0885-8977 1937-4208
DOI:	10.1109/TPWRD.2005.855477