Browsing by Author "Mariano, S. J. P. S."
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- Nonlinear optimization method for short-term hydro scheduling considering head-dependencyPublication . Catalão, João Paulo da Silva; Mariano, S. J. P. S.; Mendes, Victor; Ferreira, L. A. F. M.This paper is on the problem of short-term hydro scheduling, particularly concerning head-dependent reservoirs under competitive environment. We propose a new nonlinear optimization method to consider hydroelectric power generation as a function of water discharge and also of the head. Head-dependency is considered on short-term hydro scheduling in order to obtain more realistic and feasible results. The proposed method has been applied successfully to solve a case study based on one of the main Portuguese cascaded hydro systems, providing a higher profit at a negligible additional computation time in comparison with a linear optimization method that ignores head-dependency.
- A practical approach for profit-based unit commitment with emission limitationsPublication . Catalão, João Paulo da Silva; Mariano, S. J. P. S.; Mendes, Victor; Ferreira, L. A. F. M.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.
- Sistema de suporte para tomada de decisão: despacho económico em ambiente de mercado de carbonoPublication . Mendes, Victor; Catalão, J. P. S.; Mariano, S. J. P. S.; Ferreira, L. A F. M.Nesta comunicação é apresentada uma contribuição para a criação de uma aplicação para um sistema de informação de tomada de decisão de despacho económico na operação de grupos térmicos em sistemas de energia eléctrica, considerando a emissão poluente em ambiente de mercado de carbono; é formulado o despacho económico com consideração da emissão poluente como um problema de programação matemática multiobjectivo (biobjectivo), sendo as funções objectivo convexas e continuamente diferenciáveis; é estudada a identificação do óptimo de Pareto recorrendo às condições de Karush-Kuhn-Tucker; é apresentado e discutido um caso de estudo.
- Unit Commitment in a Competitive and Emission Constrained EnvironmentPublication . Catalão, João Paulo da Silva; Mariano, S. J. P. S.; Mendes, Victor; Ferreira, L. A. F. M.This paper is on the unit commitment problem, considering not only the economic perspective, but also the environmental perspective. We propose a bi-objective approach to handle the problem with conflicting profit and emission objectives. Numerical results based on the standard IEEE 30-bus test system illustrate the proficiency of the proposed approach.