Decomposition Problem in Process of Selective Identification and Localization of Voltage Fluctuation Sources in Power Grids

Voltage fluctuations are common disturbances in power grids; therefore, an effective and selective process of for the identification and localization of individual voltage fluctuations sources is necessary in order to minimize such disturbances. Selectivity in the process of identification and localization of disturbing loads is made possible by the use of a cascade of blocks: demodulation, decomposition, and propagation assessment. The effectiveness of this approach is closely related to the method of decomposition that is used. This paper presents the problem of the decomposition process for the selected method of the selective identification and localization of voltage fluctuation sources, in which the algorithm of enhanced empirical wavelet transform (EEWT) is used as the decomposition method. The paper presents selected research results from the real power grid, in which the selected approach causes mistakes in the identification and localization of voltage fluctuation sources. The potential causes of mistakes related to the decomposition process are discussed on the basis of the obtained research results.