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A practical approach for profit-based unit commitment with emission limitations

Catalão, J.P.S. ; Mariano, S.J.P.S. ; Mendes, V.M.F. ; Ferreira, L.A.F.M.

International Journal of Electrical Power and Energy Systems Vol. 32, Nº 3, pp. 218 - 224, March, 2010.

ISSN (print): 0142-0615
ISSN (online):

Journal Impact Factor: 0,714 (in 2008)

Digital Object Identifier: 10.1016/j.ijepes.2009.07.006

This paper proposes a practical approach for profit-based unit commitment (PBUC) with emission limitations. Under deregulation, unit commitment has evolved from a minimum-cost optimisation problem to a profit-based optimisation problem. However, as a consequence of growing environmental concern, the impact of fossil-fuelled power plants must be considered, giving rise to emission limitations. The simultaneous address of the profit with the emission is taken into account in our practical approach by a multiobjective optimisation (MO) problem. Hence, trade-off curves between profit and emission are obtained for different energy price profiles, in a way to aid decision-makers concerning emission allowance trading. Moreover, a new parameter is presented, ratio of change, and the corresponding gradient angle, enabling the proper selection of a compromise commitment for the units. A case study based on the standard IEEE 30-bus system is presented to illustrate the proficiency of our practical approach for the new competitive and environmentally constrained electricity supply industry.