  In this paper, we propose an energy-based method for the transient stability
analysis of a power system transmission switching event. In this method the
exit point of pseudo-fault trajectory is used to determine a relevant
controlling unstable equilibrium point (CUEP) for a switching event, the
stability of the switching event is then assessed based on the energy margin
between the computed relevant CUEP and the post-switching initial point. The
effectiveness of the method is demonstrated on switching events in the
structure-preserving models of a heavily loaded version of the WSCC 9-bus
3-machine system, and the base case IEEE 145-bus 50-machine system. A scheme
for the detailed analysis of power system switching events is then proposed.
