Flexible DC distribution line wave velocity measurement method and system

The invention provides a flexible direct current distribution line wave velocity measurement method and system, and the method comprises the following steps: S1, starting a current converter, and generating a voltage traveling wave through the step adjustment of the direct current voltage of an outlet bus; s2, recording the arrival moments of detection traveling waves at the outlet bus measuring points of the converter and all measuring points along the line; s3, calculating the wave velocity between any two front and back measuring points according to the physical interval between the measuring points and the arrival time of the traveling wave of each measuring point; and S4, calculating corresponding wave velocities by detecting multiple voltage traveling waves, and taking an average value of multiple calculation results as a final result. According to the method, the problem of inaccurate wave velocity calculation according to line parameters in a traditional method is solved, online wave velocity measurem