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Investigation of supra-harmonics through signal processing methods in smart grids

100%

Yalcin T. , Ozdemir M. , Kostyla P. , Leonowicz Z.

Transactions on Environment and Electrical Engineering

2017

tom Vol. 2, No. 2

80--85

Nowadays supra-harmonic distortion studies are gaining attention day by day in power quality research area. When handling communication systems especially Power Line Carrier (PLC) systems in frequency range 2-150 kHz, they are suitable for causing electromagnetic interference (EMI) to other systems. This study shows results of analysis employing advanced method called ensemble empirical mode decomposition (EEMD) to describe supra-harmonic distortion. Unlike the traditional method (short time fourier transform-STFT), EEMD gives extensive representation for supra-harmonic components.

Evaluation of electric fields influence on hydrotechnical constructions using STFT

51%

Zakowski K. , Darowicki K.

Polish Journal of Environmental Studies

2005

tom 14

nr Suppl.1

A method of detection of electric field using the Short Time Fourier Transformation (STFT) is presented. This particular kind of signal analysis makes the determination of changes of the spectral power density of a signal (e.g. structure to electrolyte potential) in function of time possible. The results of joint time-frequency analysis of the potential in the stray currents field are presented. The spectrogram is a composition of spectral lines of defined frequency distribution. A good correlation of localization of spectral lines corresponding to stray current generator and construction potential in time domain is visible. The comparison of time and frequency localization of peaks from spectrograms is unambiguous evidence that the stray current field interfered on the investigated construction. A presented result unambiguously shows the possibility of accurate identification of source of stray currents and its interference on the metal construction.