The invention discloses a distribution network fault positioning method,
system and device based on
variational mode decomposition and a medium, and relates to the technical field of power
system fault positioning, and the method comprises the steps: collecting a traveling wave
signal of a power distribution network, and carrying out the preprocessing of the collected traveling wave
signal; performing
modal decomposition on the preprocessed traveling wave
signal, and outputting a plurality of
modal components; based on the mode component obtained through
decomposition, wave head
arrival time is extracted; performing correction compensation based on the wave head
arrival time difference, the
phase difference and the propagation characteristics, and calculating the relative distance between the fault point and the known node; calculating the position coordinates of the fault point in the distribution network according to the geographic coordinates and the direction vectors of the nodes in combination with the relative distance; and constructing a
visual interface, displaying the position of a fault point, and storing the traveling wave signal data and a fault positioning result into a
database. According to the method, the adaptive correction function and the
time difference compensation model are constructed, so that
time difference errors caused by factors such as frequency change and phase nonlinearity can be corrected, and the accuracy of fault positioning is improved.