Analysis of power quality in presence of frequency distortions

Abstract

<jats:p>Today, semiconductor elements are becoming more popular in power supply networks. Their presence in any objects of electrical equipment provides high performance with high operating efficiency. However, modern research shows the semiconductor element base negatively affects quality of electricity when they are used in parallel. In lowand medium-voltage networks, this is fraught with the appearance of frequency «noise», which negatively affects parameters equipment with presence of latter, as well their control system. To detect them, a special approach is necessary, since such harmonics can appear both from directly semiconductor elements and from operating mode of equipment where element base is applied. The purpose of this article identifies higher harmonic distortions generated by objects containing semiconductor elements.</jats:p>

On the influence of electric power quality on the decimation of currents and voltages of utility frequency

“…A comparative analysis of expressions ( 5) and (8) shows that the difference between the estimate of the complex amplitude Sx and the unnormalized crosscorrelation coefficient Rxxb consists only in the use of complex values in (5). Thus, the similarity of the analyzed expressions once again confirms the possibility of using the cross-correlation coefficient to characterize the coherence of digital signal processing.…”

“…Consider the levels of harmonic distortions introduced into the network by the largest industrial power receivers [6][7][8][9].…”