A Dynamic Generator Coherency Identification Method Based on Phase Trajectory Vector

A novel dynamic generator coherency identification method is proposed in this paper. This method is based on the phase trajectory vectors (PTVs) of generators. To form the PTVs, only phase angle and angular velocity of each generator are necessary. The time-rolling updated feature matrix which indicates the location and direction of PTVs are essential in this method. Based on the feature matrix, the hierarchical clustering is applied to identify the coherent groups. The proposed method is independent of system conditions and disturbance, self-adapted to various situations. Moreover, it can track the dynamic evolution of generators coherency. The simulation results in New England 39 bus power system verify the validity of the proposed method.