Nonlinear phenomena, including bifurcations, chaos and crises, have been determined to be crucial factors in the inception of voltage collapse in power system models. The issue of controlling voltage collapse in the presence of these nonlinear phenomena is addressed in this paper. The work employs a example power system model akin to one studied in several recent papers. The bifurcation control approach is employed to modify the bifurcations and to suppress chaos and crises. The control law is shown to result in improved performance of the system for a greater range of parameter values