Noise Reduction of Power Quality Measurements with Time-Frequency Depth Analysis

Petar Mostarac, Roman Malarić, Katarina Mostarac and Marko Jurčević
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Petar Mostarac: Department of Fundamentals of Electrical Engineering and Measurement, Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb 10 000, Croatia
Roman Malarić: Department of Fundamentals of Electrical Engineering and Measurement, Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb 10 000, Croatia
Katarina Mostarac: Department of Postal Transport, Faculty of Transport and Traffic Sciences, University of Zagreb, Zagreb 10 000, Croatia
Marko Jurčević: Department of Fundamentals of Electrical Engineering and Measurement, Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb 10 000, Croatia

Energies, 2019, vol. 12, issue 6, 1-19

Abstract: This paper presents the noise reduction of power quality measurement with time-frequency (T-F) depth analysis. Noise reduction is achieved with wavelet transformation by decomposition, thresholding and lossless reconstruction of signal. Three main problems with T-F noise reduction with wavelet transformation are: defining thresholding levels, level of decomposition and number of wavelet vanishing moment. In this analysis decomposition level and number of vanishing moments are defined via simulation for pure sinusoid signal, these values are used for signals with perturbations and they provide reasonable results. Analysis is conducted by simulating various change of parameters and then approved by laboratory measurement with calibrators and precision measurement equipment. The paper describes a method for noise reduction of signal without prior knowledge of noise level or signal amplitude. Proposed method is able to separate noise without adding phase shift for diverse signal conditions, harmonics, interharmonics, dips, swells and dynamic variations.

Keywords: discrete wavelet transformation; noise reduction; power quality measurement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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