Method for screening ultra-low frequency oscillation sensitive units of electric power system

The invention discloses a method for screening ultra-low frequency oscillation sensitive units of an electric power system, which comprises the steps of A, building a simulation model; B, performing small interference analysis and calculation on various modes for each hydropower generating unit by using the simulation model to obtain an oscillation mode i with the frequency being less than 0.1Hz, and obtaining a correlation factor pik of each unit under the mode, wherein i represents the oscillation mode i, and k represents a kth generator; C, respectively calculating a correlation coefficient Rik of each hydropower generating unit under each mode according to the correlation factor pik; and D, performing judgment on an ultra-low frequency oscillation sensitive unit according to the correlation coefficient Rik. According to the invention, the correlation coefficient Rik of each hydropower generating unit is acquired based on the correlation factor pik under the ultra-low frequency oscillation mode i, so that