The invention discloses a based on fault recording data

The embodiment of the invention discloses a DC voltage ripple coefficient calculation method and system based on fault recording data. The method comprises the steps of obtaining a fault recording data file; Extracting direct-current voltage channel data from the fault recording data file, and calculating a direct-current effective value; Generating alternating-current component data of the channel according to the extracted direct-current voltage channel data and the calculated direct-current effective value; Calculating an effective value of the channel alternating current component; And calculating the ripple coefficient of the DC voltage. A new mode is adopted to calculate the voltage ripple coefficient of the DC power supply in the station, and the method does not depend on oscilloscope equipment and is economical and reliable. Peak-to-peak of bus voltage must be set during operation of direct current power supply system The peak value is monitored, the ripple coefficient of the direct-current power supp