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Study Findings from University of Cadiz Broaden Understanding of Kurtosis (Application of Spectral Kurtosis To Characterize Amplitude Variability In Power Systems’ Harmonics)

Source: 
Health & Medicine Daily

2019 APR 12 (NewsRx) -- By a News Reporter-Staff News Editor at Health & Medicine Daily -- Investigators discuss new findings in Kurtosis. According to news reporting from Algeciras, Spain, by NewsRx journalists, research stated, “The highly-changing concept of Power Quality (PQ) needs to be continuously reformulated due to the new schemas of the power grid or Smart Grid (SG). In general, the spectral content is characterized by their averaged or extreme values.”

Financial support for this research came from Spanish Government.

The news correspondents obtained a quote from the research from the University of Cadiz, “However, new PQ events may consist of large variations in amplitude that occur in a short time or small variations in amplitude that take place continuously. Thus, the former second-order techniques are not suitable to monitor the dynamics of the power spectrum. In this work, a strategy based on Spectral Kurtosis (SK) is introduced to detect frequency components with a constant amplitude trend, which accounts for amplitude values’ dispersion related to the mean value of that spectral component. SK has been proven to measure frequency components that follow a constant amplitude trend. Two practical real-life cases have been considered: electric current time-series from an arc furnace and the power grid voltage supply. Both cases confirm that the more concentrated the amplitude values are around the mean value, the lower the SK values are.”

According to the news reporters, the research concluded: “All this confirms SK as an effective tool for evaluating frequency components with a constant amplitude trend, being able to provide information beyond maximum variation around the mean value and giving a progressive index of value dispersion around the mean amplitude value, for each frequency component.”

For more information on this research see: Application of Spectral Kurtosis To Characterize Amplitude Variability In Power Systems’ Harmonics. ENERGIES, 2019;12(1):. ENERGIES can be contacted at: Mdpi, St Alban-Anlage 66, Ch-4052 Basel, Switzerland.

Our news journalists report that additional information may be obtained by contacting J.M. Sierra-Fernandez, University of Cadiz, Computat Instrumentat, Paidi Tic 168, Av Ramon Puyol, Algeciras 11202, Spain. Additional authors for this research include J.J.G. de la Rosa, J.C. Palomares-Salas, S. Ronnberg and M.H.J. Bollen.

The direct object identifier (DOI) for that additional information is: https://doi.org/10.3390/en12010194. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.

 

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