One of the major causes of voltage instability is the reactive power limit of the system. Improving the system's reactive power handling capacity via Flexible AC transmission System (FACTS) devices is a remedy for prevention of voltage instability and hence voltage collapse. In this paper, the effects of Shunt Capacitor, SVC and STATCOM in Static Voltage Stability Margin Enhancement will be studied. The continuation power flow methods are proposed in case of the increasing loading of contingency. The IEEE-14 bus system is simulated to test the increasing loadability. It is found that these devices significantly increase the loadability margin of power systems.
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