Optimal Location of UPFC Considering Total Fuel Cost and Active Power Losses by Fuzzy Optimization Method

This paper presents a Fuzzy optimization method to enhance the operational planning optimal power flow (OPF) considering unified power flow controller (UPFC). The OPF problem is formulated as a nonlinear constrained objective optimization problem with both equality and inequality constraints. The proposed procedure is very significant to eliminate violation constraints and to give an optimal solution. The proposed multi-objective functions are to optimize the total fuel cost and active power losses. Firstly, the total fuel cost generation and active power losses objective functions are optimized individually in order to define the membership function of objective, then, the multi-objective problem is reformulated into a new standard nonlinear problem by the fuzzy sets theory and max-min operator. Finally, it is solved by nonlinear programming with discontinuous derivatives (DNLP) method. The simulation results of IEEE 3-generator 14-bus System show performance of method.