A novel termination algorithm of time-domain simulation for power system transient stability analysis based on phase-plane trajectory geometrical characteristic

Time-domain simulation (TDS) for power system transient stability is less efficient and tedious, and there is no uniform standard to determine the transient stability based on empirically observation of the disturbed trajectories, which make the efficiency and reliability cannot be satisfied at the same time. A novel termination algorithm of time-domain simulation for transient stability analysis based on phase-plane trajectory geometrical characteristic is proposed in this paper. The output of time-domain simulation is used to analysis the transient stability, and once the system is judged to be stable or unstable, the time-domain simulation program is terminated. First, the transient instability can be detected quickly based on the convexity and concavity of phase trajectory; and if the phase trajectory is convergent and the oscillation is damped, the system can be detected to be stable early. The proposed method is easy to achieve, the efficiency and validity is verified by simulations on IEEE 39-bus 10-unit system.