“…Currently, power engineers are much more concerned about stability problem due to blackout in Northeast United States, Scandinavia, England and Italy (Kumkratug, 2010;Padma and Rajaram, 2011;Osuwa and Igwiro, 2010;Kumkratug, 2011a). They have proposed many methods to improve stability of power system such as load shedding, Flexible AC Transmission System (FACTS), (Al-Husban, 2009;Kumkratug, 2011b;Magaji and Mustafa, 2009;Mustafa and Magaji, 2009;Zarate-Minano et al, 2010).…”