  This paper proposes a hybrid technique for secured optimal power flow coupled
with enhancing voltage stability with FACTS device installation. The hybrid
approach of Improved Gravitational Search algorithm (IGSA) and Firefly
algorithm (FA) performance is analyzed by optimally placing TCSC controller.
The algorithm is implemented in MATLAB working platform and the power flow
security and voltage stability is evaluated with IEEE 30 bus transmission
systems. The optimal results generated are compared with those available in
literature and the superior performance of algorithm is depicted as minimum
generation cost, reduced real power losses along with sustaining voltage
stability.
