Two-terminal traveling wave fault location based on successive variational mode decomposition and frequency-dependent propagation velocity

摘要

This paper proposes a two-terminal traveling wave fault location method based on Successive Variational Mode Decomposition (SVMD) and frequency-dependent propagation velocity. Firstly, SVMD is used to extract all Intrinsic Mode Functions (IMFs) and their center frequencies of the aerial mode voltages in a successive manner. The maximum IMF with the highest center frequency is used for further processing. Secondly, The propagation velocity is obtained by frequency-velocity characteristic curve and the arrival time of traveling wavefront is determined by the normalized Teager Energy Operator (TEO). Finally, considering the time -domain and frequency-dependent characteristics of traveling wave, the fault distance is estimated by combining the arrival time, frequency and propagation velocity. PSCAD/EMTDC simulation results show that the proposed method achieves reliable and robust performance under different fault scenarios and outperforms compared existing methods.

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