“…Powerful computational tools for bifurcation analysis have been applied to study nonlinear problems arising in power systems, and in some cases, to relate this study to observed nonlinear phenomena in power systems, see for example [Abed & Varaiya, 1984;Abed et al, 1993;Ajjarapu & Lee, 1992;Cao & Chen, 2002;Chiang et al, 1990;Chiang et al, 1993;Dobson & Chiang, 1989;Kwatny et al, 1995;Makarov et al, 2000;Tan et al, 1995;Yorino et al, 1994]. Furthermore, some counter-measures to avoid bifurcations have been developed to design control schemes for prevention of power system instabilities.…”