A VMD-Based Double-Ended Traveling Wave Fault Location Method for Distribution Networks

Distribution networks are often large in scale and complex in structure, which brings great challenges to fault positioning. The traditional fault positioning method has problems such as inaccurate time of location sampling signal and insufficient positioning accuracy. For example, wavelet method can not handle non-linear non-stationary signals in actual engineering, and EMD (Empirical Mode Decomposition) is prone to modal aliasing phenomenon. Therefore, after studying the characteristics of traveling wave, this paper proposes a decomposition of VMD (Variational Modal Decomposition) of the high frequency component of traveling wave, and then proposes an algorithm to locate the fault by using the time difference between the two ends of the line, so as to optimize the accuracy of the fault distance measurement. PSCAD and Matlab editing algorithms were used to verify the simulation results with the advantages of fast localization speed and small localization error.