Improving large-disturbance stability through optimal bifurcation control and time domain simulations

This paper presents an approach for improving, through practical assumptions, the stability of power systems subjected to large disturbances. The proposed method is composed of two steps, solved iteratively. The first step solves an optimal bifurcation control problem that guarantees the small-signal stability of the equilibrium point. The proposed optimal bifurcation control addresses saddle-node and Hopf bifurcations. The second step is an N − 1 contingency analysis computed through time domain simulations. The second step guarantees the large-disturbance stability of the equilibrium point. The WSCC 9-bus and New England 39-bus systems are used to illustrate and test the proposed technique.