Dynamical analysis of voltage stability for a simple power system

The nonlinear dynamical systems theory to voltage stability analysis is int roduced in this paper. The property that the number of equilibrium points ( EPs) varies with operation parameters is investigated, and the stability of every equilibrium point (EP) is explored. A simple and efficient method of locating static bifurcation points is presented. Voltage stability regions of the system are constructed in state space considering the dynamics of o n-load tap-changer (OLTC) and load. Finally, the application of the theory to voltage stability analysis is illustrated by time-domain simulation. The work of this paper is essential to the understanding of voltage collapse p henomenon. (C) 2001 Elsevier Science Ltd. All rights reserved.