Implementation method of additional damping controller of high-voltage direct-current system

An implementation method of an additional damping controller of a high-voltage direct-current system comprises the following steps: performing low-frequency oscillation identification through a characteristic root analysis method to obtain an oscillation mode of an alternating-current and direct-current hybrid system; then, based on the synchronous generator low-frequency oscillation mathematical model, an additional damping controller model of the high-voltage direct current system is initialized to provide additional damping torque to suppress low-frequency oscillation; and optimizing the structure and parameters of the additional damping controller of the high-voltage direct-current system according to the phase compensation principle and the low-frequency oscillation mode of the system. Theoretical support can be provided for the design of the additional damping controller of the direct-current line, the high-voltage direct-current line is enabled to realize suppression of low-frequency oscillation betwee