Subsynchronous oscillation analysis based on prony identification method

Subsynchronous oscillation is a serious stability problem that can exist in a power system. It can not only cause power oscillation in the system, but also cause shaft fatigue and possible damage or failure of the generator involved. Previous SSO analysis methods based on linear system equations had a lot of defects or were even impossible in engineering application. For these reasons, a prony identification method was developed to get the reduced-order linear opened-loop model of the complex hybrid HVDC/AC transmission systems. As comparison, both the transient torque simulation method and prony method were used to analysis 2008 Guizhou power system in the time and frequency domain. The analysis result shows that the certain operation conditions can cause Subsynchronous oscillation. With the method the characters of Subsynchronous oscillation of complex HVDC/AC transmission systems and large AC system with FACTS devices can be analyzed accurately.