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In the past decade, the problem of optimal power flow (OPF) for improving economy and security of power system operation has received much attention. The OPF problem solution aims to optimize an objective function such as the fuel cost via optimal adjustment of the power system control variables, while at the same time satisfying various equality and inequality constraints. Generally, the OPF problem is a large- scale highly constrained nonlinear nonconvex optimization problem with several objectives. In deregulated environment, OPF is of current interest of many utilities and it...