New Concepts Of Optimizing Unit Commitment And Economic Load Dispatch Costs In Large Scale Power Systems

Musse Mohamud , Ahmed and Ismail, Hassan and Norhamimi, Hamdan (2003) New Concepts Of Optimizing Unit Commitment And Economic Load Dispatch Costs In Large Scale Power Systems. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Utility companies have to solve the problems of deciding how the varying demand for electricity can be met with optimum cost, which has a daily and weekly cycles. As electricity cannot be stored, it is necessary to start-up and shutdown a number of generating units at various power stations each day. The unit commitment (UC) and economic load dispatch (ELD) problems are to decide when and which generating units are to start-up and shut-down, in order to minimize the total fuel cost or to maximize the total profit, over a study period of typically a day, subject to a large number of difficult constraints that must be satisfied. The most important constraint is the balancing output and the total generation forecasted half-hourly or hourly consumer demands. As unit commitment along with economic load dispatch is as such difficult combinatorial optimization problem, this project will apply suitable approaches such as LaGrangian Relaxation (LR), and Bundling application techniques to solve unit commitment for economic loading to meet the required optimization criteria of generating units. The proposed techniques are efficient because of their unique characteristics of quickly reducing the computer run-time required to find an excellent feasible schedule to just a few seconds and substantially optimizing the total generation costs. After applying these techniques to the UC and ELD, it has been found that the small and medium generators used have shown significant cost reduction and fast computation time. This proves that LR techniques along with bundling method is the current choice for UC and ELD solution techniques.

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