Low-frequency oscillation dominant mode recognition method and system and storage medium

The invention discloses a low-frequency oscillation dominant mode identification method and system and a storage medium. The method comprises the following steps: S1, acquiring an active power curve of a line, performing EMD decomposition on the active power curve, and removing high-frequency and direct-current components; s2, carrying out Prony analysis on the active power curve without the high-frequency and direct-current components to obtain parameter initial values of all oscillation modes, and selecting a mode with the maximum oscillation energy as a dominant mode; s3, determining an adjustment direction of a certain parameter of the dominant mode; s4, taking the initial value of the parameter obtained by Prony analysis as a starting point, adjusting the parameter according to an adjusting direction and a set step length, and calculating a correlation coefficient of the adjusted dominant mode curve and the original active power curve; s5, repeating the step S4 until the correlation coefficient of the ad