Browsing by Author "Lima, LMM"
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Item Open Access Cooperative game theory and last addition method in the allocation of firm energy rights(Applied Energy, 2018-09-15) Faria, VAD; de Queiroz, AR; Lima, LMM; Lima, JWM© 2018 Elsevier Ltd The firm energy rights of a hydro plant is a parameter used in some electricity markets to define the maximum amount of energy that a power plant can trade through contracts. In a centralized dispatch scheme, the coordinated operation of the hydro plants generates a synergetic gain in the system firm energy, in this setting, a question that often arises is how to fairly allocate this energy among each hydro plant. This work proposes a formulation to compute the firm energy rights of hydro plants using cooperative game theory and the last addition allocation method. The main goal is to integrate the interests of hydro agents with the needs of the regulatory agencies, searching in the core of the game for solutions that give the right incentives to the optimal system development. In order to make simulations of real instances possible, it is proposed a reformulation of the traditional mixed integer linear programming model that computes the core constraints, which induces a significant speed-up of the algorithm solution time. It is shown an application of the proposed methodology to a real instance representing the Brazilian electric power system.Item Open Access How Efficient are the Brazilian Electricity Distribution Companies?(Journal of Control, Automation and Electrical Systems, 2015-06) Xavier, SS; Lima, JWM; Lima, LMM; Lopes, ALMItem Open Access Hydropower revenues under the threat of climate change in Brazil(Renewable Energy, 2019-04-01) de Queiroz, AR; Faria, VAD; Lima, LMM; Lima, JWM© 2018 Elsevier Ltd This work analyzes the impacts of climate change in the revenues of hydropower plants. One important input for designing and evaluating investment opportunities in hydropower is the water inflows historical data. Unfortunately, the use of such information alone may not project well the future power generation due to the influence of climate change in the water inflow patterns. This paper introduces spatio-temporal information of the future climate into the operational planning of the Brazilian hydropower system. Global climate models from IPCC are considered along with downscaled regional climate models. Our results at the individual hydro plant level show the importance of taking into account climate change information when performing hydro generation planning studies.Item Open Access Modeling and forecasting of Brazilian reservoir inflows via dynamic linear models(International Journal of Forecasting, 2014-07) Lima, LMM; Popova, E; Damien, P