  This paper investigates the effect of FACTS Devices on voltage stability
constrained Optimal Power Flow (OPF) formulation where the objective function
is to minimize power system load curtailment. Incorporating FACTS Devices
affects the topology and hence the power flow distribution. Some numerical
cases are presented to discuss the effects of FACTS Devices that is expected
when it is incorporated into the load curtailment formulation. The test result
reflects the impacts FACTS Devices has in reducing load curtailment during a
line congestion situation. The paper also discusses the applicability of
approach in security based reliability studies for systems having control
components like FACTS Devices.
