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AbstrPcr-Effective voltage control schemes have been brought to attention in a comiderable number of studies, M power system loads are located farther away from power plnnts and reactive power losses have tended to increase due to the heavier power flow with high load growth and long distance transmission. In this paper, we propose on-line voltage stability preventive control. In order to simulate contingency analysis efficiently, we propose prwontingency analysis which is ranked by a new voltage stability index Wit. The W I t is based on the conventional index VIP1 and it is used for assessing the effect on voltage stability in different generators as weIL I d e t Terms-contingency analysis, power system, preventive control, voltage stability, voltage stability index W I , voltage stability Index WPIt

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