The application provides a power distribution network fault accurate positioning method based on multi-terminal traveling wave wave head calibration and
wave speed inversion, and belongs to the technical field of power distribution network fault positioning. The application comprises the following steps: installing a traveling wave collection terminal at multiple nodes of a power distribution network, and synchronously sampling to obtain a fault traveling wave
signal; performing optimal phase-
mode transformation to extract optimal line-mode components, and determining an initial traveling wave wave head coarse positioning time; adopting an ESMD-VMD-TEO
adaptive method to calibrate the optimal line-mode components with high precision, and obtaining wave head positions of each measuring point; establishing a multi-terminal traveling wave positioning equation
group based on the relationship between the wave head
arrival time and the wave
head position of each measuring point; constructing a weighted least square objective function based on the multi-terminal traveling wave positioning equation group, and inversely calculating a fault position, a traveling wave
wave speed and a
fault occurrence time by means of a Levenberg-Marquardt
algorithm; constructing an
energy spectrum correlation
degree matrix to distinguish a fault
branch; and outputting an accurate fault point position, a traveling wave
wave speed and a positioning error
confidence interval. The application realizes a
tower level accurate positioning of a complex power distribution network fault.