Evaluation of Power Angle Stability of Power System Based on Eigenvalues of Trajectory Section

For a long time, the performance of transient stability evaluation has been influenced by time-varying factors. The TSE method considers both model and trajectory information, and extends the traditional eigenvalue technology, which was originally only applicable to the original point, to any section on the disturbed response. For the purpose of exploring the effect of trajectory section eigenvalue method on the transient stability evaluation, this paper clarifies the theory of the trajectory section eigenvalue, and establishes an online assessment framework for mid- and long-term transient stability based on the WSCC three-machine nine-node system. Through this framework, dispatch agency can make stability judgments in advance, and realize oscillation positioning control before instability happen, which can greatly reduce the predictive time for online stability assessment.