“…Many techniques have been proposed in the literature for evaluating and predicting voltage stability. Among these techniques are P-V curves (Pal, 1992;Suzuki et al, 1992), Q-V curves (D'Aquila et al, 1993;Schluter, 1998;Taylor, 1994), modal analysis (Gao et al, 1992;Morrison et al, 1993;Mansour et al, 1994), minimum singular value (Löf et al, 1993;Liu et al, 1998), sensitivity analysis (Begovic and Phadke, 1992;Fltabo and Dommel 1990), energy function (Overbye and DeMacro, 1995;DeMacro and Overby, 1990), reactive power optimization (Tamura et al, 1982), artificial neural networks (Jesasuray, 1990;El-Keib and Ma, 1995) and neuro-fuzzy networks (Liu and Su, 1998). Large numbers of research papers on power systems voltage stability have been published recently by the IEEE Voltage Stability Working Group (Ajjarapu and Lee, 1998).…”