A transient stability assessment method based on the trajectory in the dimension-reduced power-angle space

This paper proposed a new transient stability assessment (TSA) method based on the power angle space reduction on the trajectory phase plane (TPP). Firstly, the dimension of the power angle trajectory was reduced in power-angle space. Secondly, the trajectory was projected in a one-dimensional coordinate axis in order to present its physical significance. Thirdly, a new phase plane was formed according to the motion parameters that obtained by dimension reduction. Finally, the transient stability can be judged by the convexity of trajectory in the new phase plane. Concluded from the simulations of the New England 39-Bus system, our method is effective, efficient and can be applied on-line.