The Influence of Measurement Methodology on the Accuracy of Electrical Waveform Distortion Analysis

Abstract

The present paper covers a review of documents that specify measurement methods of voltage waveform distortion. It also presents measurement stages of waveform components that are uncommon in the classic fundamentals of electrotechnics and signal theory, including the creation process of groups and subgroups of harmonics and interharmonics. Moreover, the paper discusses selected distortion factors of periodic waveforms and presents analyses that compare the values of these distortion indices. The measurements were carried out in the cycle per cycle mode and the measurement methodology that was used complies with the IEC 61000-4-7 norm. The studies showed significant discrepancies between the values of analyzed parameters.

Influence of the Phenomenon of Spectrum Leakage on the Evaluation Process of Metrological Properties of Power Quality Analyser

“…The problem of determining the values of harmonics and related errors, for different values of frequency f , is a complex measurement task. The raised issues are discussed in a number of publications [18][19][20][21][22][23]. In the publications [24][25][26][27][28][29] the authors describe methods for improving the FFT algorithm when thefrequency changes, with the use of the developed algorithms, while in the publications [30][31][32] the authors present their own approach to solving the problem-i.e., they propose to use a "Flat Top" window in FFT analysis instead of using a basic rectangular window.…”

Problem of Total Harmonic Distortion Measurement Performed by Smart Energy Meters

“…It is worth noting that increasing number of power electronic and energy-saving devices supplied from the power grid results in increasing voltage distortion. Hence, it is important that THD measurements are made as accurately as possible [12], [13], [14], [15]. In practice, this purpose is realized by performing measurements in accordance with the relevant standard, which specifies the THD measurement method and the THD measurement uncertainty [6].…”