Keerati Chayakulkheeree2551-02-222551-02-222550-10-25http://dspace.spu.ac.th/handle/123456789/818In this paper, the fuzzy set theory is applied to model the soft constraint limits. The fuzzy constrained optimal dispatch is formulated as a fuzzy optimization problem and converted into a crisp optimization problem. An efficient successive linear programming method is then modified to solve the new problem. Numerical test results on IEEE 30-bus system show that the fuzzy constrained method could give a good trade-off between reducing generation cost and satisfying constraints, and produce more realistic generation schedules when a feasible solution cannot be obtained by using the crisp OPF.en-USOptimal Power DispatchFuzzy Linear ProgrammingArticle