-An optimal scheduling of units in an electric spot market presents in this paper. Unit commitment is a non-linear and complex combinatorial optimization problem which is difficult to be solved for large-scale power systems so this study addresses a linear expression of the problem. Proposed approach is a mixed-integer linear programming to minimize the total energy dispatch cost in 24 hours of a day. A system as the same structure as Iranian power market is used to demonstrate the linear expression of the problem. Simulation results compared with another approach. The results shows the applicability of the proposed method.

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