Online Identification of Dominant Characteristic Modes of Small Signal Disturbance and Selection of Strong Correlative Units

The source and development of online computation methods of power system small signal stability as well as the common used mathematical model of generators and eigenvalue analysis method are introduced.On this basis, according to eigenroot and damping ratio, the identification procedures of dominant oscillation modes for small signal disturbance analysis and the selection algorithm for strong correlative units under dominant characteristic modes are proposed, and the termination condition of the proposed algorithm is given.The phase characteristics of oscillation modes are analyzed in depth and used in the clustering of strong correlative units.A concept of clustering coefficient of correlation factor and its meaning are put forward.The proposed method is verified by two calculation examples.