ISEL - Eng. Electrotécn. - Artigos
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Browsing ISEL - Eng. Electrotécn. - Artigos by Subject "Algorithm"
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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.
- Scheduling of a hydro producer considering head-dependency, price scenarios and risk-aversionPublication . Pousinho, Hugo Miguel Inácio; Mendes, Victor; Catalão, João Paulo da SilvaIn this paper, a mixed-integer quadratic programming approach is proposed for the short-term hydro scheduling problem, considering head-dependency, discontinuous operating regions and discharge ramping constraints. As new contributions to earlier studies, market uncertainty is introduced in the model via price scenarios, and risk aversion is also incorporated by limiting the volatility of the expected profit through the conditional value-at-risk. Our approach has been applied successfully to solve a case Study based on one of the main Portuguese cascaded hydro systems, requiring a negligible computational time.
- Short-term wind power forecasting in Portugal by neural networks and wavelet transformPublication . Catalão, João Paulo da Silva; Pousinho, Hugo Miguel Inácio; Mendes, VictorThis paper proposes artificial neural networks in combination with wavelet transform for short-term wind power forecasting in Portugal. The increased integration of wind power into the electric grid, as nowadays occurs in Portugal, poses new challenges due to its intermittency and volatility. Hence, good forecasting tools play a key role in tackling these challenges. Results from a real-world case study are presented. A comparison is carried out, taking into account the results obtained with other approaches. Finally, conclusions are duly drawn. (C) 2010 Elsevier Ltd. All rights reserved.
- 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.