Dynamic Scheduling with Unit Commitment, Constraints and Real Transmission Losses

Abstract

Scheduling of generator units must lead to the lowest cost of electrical energy produced and the shortest computer execution time. Dynamic load, fuel cost variations of the generator units, existence of the constraints and transmission losses are some of problems that must be answered in the scheduling of generator units. The lowest fuel cost will be achieved if the generator units that have the highest fuel cost is turned off from the power system under low load conditions. In large systems, transmission losses must also be involved as it can exceed the maximum power of a generator unit, in addition to the generator constraints that must be satisfied. This research proposes an algorithm that has considered all aspects of the dynamic scheduling. Settlement of the economic dispatch problem using direct Method because it has a very short time for computer execution. Based on the optimal economic dispatch, the generator units with the highest incremental cost is turned off. While the real transmission losses are determined by the power flow calculation using the fast-decoupled method based on the economic dispatch results. This algorithm has satisfied the generator constraints and the ramp rate limits. The proposed method has been tested on the 23-bus power system with 10 generator units and provides satisfactory results.