Novel Virtual Power Synchronous Damping Control for Low-Frequency Oscillations in GFVSG-SG Interactive System

摘要

Affected by the complex dynamic coupling between power electronic 
devices and synchronous machines, the grid-forming virtual synchronous gener
ator-synchronous generator (GFVSG-SG) interactive system suffers from weak 
inherent damping and severe low-frequency oscillations under grid disturbances, 
endangering system stable operation. To address this problem, this paper pro
poses a novel virtual power synchronous damping (VPSD) control for oscillation 
suppression. Firstly, the small-signal dynamic model of the GFVSG-SG interac
tive system is established to analyze the formation mechanism of low-frequency 
oscillation (LFO) modes. On this basis, the VPSD controller with an additional 
damping feedback loop is designed to improve the system equivalent damping. 
Taking the typical SOTA control methods as the comparison benchmark, time
domain simulations are carried out under typical disturbance conditions. The re
sults show that compared with existing SOTA control schemes, the proposed 
VPSD control can better suppress LFOs, optimize dynamic transient response, 
and effectively enhance the small-signal stability and operational robustness of 
the GFVSG-SG interactive system.