Abstract
The Most causes of Voltage instability is the sources of reactive power .In order to protect the total system from voltage instability the reactive loads can be reduced or extra reactive power can be added to reach the Voltage collapse point .The Flexible AC transmission devices(FACTS) have made it flexible and possible to prevent Voltage instability by Fast and Flexible control method . Voltage collapse point is predicted with TCSC and SVC devices and is compared with each other. The Voltage stability Indicator is derived to identify the voltage collapse point. it is concluded that voltage stability index provides a simple means to predict vulnerability of a bus in a Multibus system for voltage collapse.
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