Research on Traveling Wave Location Method of Power Grid Fault Based on EWT Transform

In order to solve the problems of modal aliasing and endpoint effect in the empirical mode decomposition (EMD) during the Hilbert Transform (HHT) decomposition process in the transmission malfunction detection process, a fault ranging scheme for HVDC hybrid transmission lines based on Empirical Wavelet Transform (EWT) was proposed, in which the EWT decomposition of the collected fault traveling wave signal was carried out to obtain the multi-resolution component, the Teager energy operator was used to solve the moment energy distribution map of the component TEO, and the peak point was substituted into the traveling wave calculation formula to determine the fault location. In order to solve the problem of the influence of fault location, the fault’s initial traveling wave signal is decomposed into mode components for computation, and the high-frequency elements in the Teager energy spectrum are chosen for substitution into the ranging formula to determine the fault location. The MMC-HVDC model is constructed within PSCAD, and the simulation outcomes demonstrate that the suggested approach can precisely determine the instantaneous frequency, instantaneous amplitude, and arrival time of traveling wave heads, thereby enhancing the precision of fault localization in hybrid transmission lines.