Propagation path criterion of sub synchronous oscillation power in the large-scale wind farm integrated system

Abstract

Sub-synchronous oscillations (SSO) caused by large-scale wind farm integrated systems have become an important issue threatening the security and stability of power systems. Some practical cases have shown that SSO can propagate through multiple voltage levels to more than hundreds kilometers. Many studies have focused on this problem, but there is a lack of research on the power propagation characteristics of SSO. In this paper, a measurement-based method for sub synchronous oscillation (SSO) propagation path criterion in SSO events is proposed. The method is based on the concept of sub synchronous power (SSP). By monitoring the sign of SSP generated by different wind farms or turbines, the propagation path can be identified. The method gives an effective way to quantitatively analyze the power propagation path of sub synchronous oscillations from the power perspective. Experimental cases demonstrate the practicality of the method.