In this paper, a heuristic algorithm combined with OPF is proposed for short-term unit commitment problem with transmission and voltage constraints. Being a very complicated combinatorial optimization problem, unit commitment is very difficult to solve, especially, for large-scale power system with network constraints. In recent years, we have proposed a heuristic algorithm based on the average full load cost without network constraints. In this study, we will propose a solution of unit commitment problem with network constraints using combination of heuristic algorithm and OPF. The proposed algorithm has been applied to IEEE 118 test system with 36 generator over 24-period. The result shows that the proposed algorithm is capable to obtain satisfactory schedules without any constraint violation.
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