Abstract
AbstractUnit commitment is one of the serious major problems encountered in power system operation, control and coordination. It is a complex non-linear problem used in the schedule of operation of generating units at minimum operating cost. This paper presents a new formulation and classical exhaustive enumeration search method for the well-known unit commitment problem for scheduling thermal and hydroelectric power generating units in a day-ahead electricity market. In the study, the two objective functions formulated are minimisation of total production cost and maximisation of the energy consumption. To effectively deal with the constraints of the problem, the difficult minimum up/down-time constraints of thermal generation units and the turbine operating constraint of hydropower stations are embedded in the binary strings that are coded to represent the on/off-states of the generating units. The Nigeria 330 kV power system containing four thermal and three hydropower plants is studied under different...
Highlights
Power systems operational planning is necessary for the best utilisation of the available energy resources to meet the varying load demand with maximum safety of equipment and personnel involved at the minimum cost without violating any system constraints
Adequate planning results in optimal unit commitment (UC) which gives great savings for the electric utilities
Unit commitment is used to determine when generating units are to be switched ON/OFF known as start-up and shut-down schedules in order to meet the forecasted load demand which changes with time (Wood & Wollenberg, 1996)
Summary
Power systems operational planning is necessary for the best utilisation of the available energy resources to meet the varying load demand with maximum safety of equipment and personnel involved at the minimum cost without violating any system constraints. The non-storable nature of the electric power makes it a challenge to meet the load demand at any time instant. Unit commitment is used to determine when generating units are to be switched ON/OFF known as start-up and shut-down schedules in order to meet the forecasted load demand which changes with time (Wood & Wollenberg, 1996). Units designated as must-run are always fully or partially dispatched This can be due to environmental impact, logical reasoning or its operational status to provide generation and/or transmission support. Dispatch must be based on the available units to meet the demand in the most effective manner These and many other factors result in a mixed combinatorial problem which determines the state of the units to be either ON or OFF (Balci & Valenzuela, 2004)
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