Encontrados 24 documentos, a visualizar página 1 de 3
Electricity cost optimization in a renewable energy
Pereira, Sérgio; Ferreira, Paula Varandas; Vaz, A. Ismael F.The variable electricity output of the renewable energy sources (RES) power plants, such as wind and hydro power technologies, is seen as an important challenge for the electricity system managers. This paper addresses the problem of an electricity system supported mainly on hydro, thermal and wind power plants, presenting a short-term model planning. A binary mixed integer non-linear optimization model for one...
Short-term scheduling model for a wind-hydro-thermal electricity system
Pereira, Sérgio; Ferreira, Paula Varandas; Vaz, A. Ismael F.This study addresses the problem of the self-scheduling of an electricity system mainly based on hydro, fossil fuel thermal and wind power plants. A binary mixed integer non-linear optimization model is described and applied to short-term electricity planning of a system close to the expected Portuguese one on the year 2020. The model is written in a GAMS code and a global optimization solver is used to obtain ...
Optimization models to support sustainable electricity planning decisions
Pereira, Sérgio; Ferreira, Paula Varandas; Vaz, A. Ismael F.Over the last decades, models and concepts related to sustainable electricity planning decisions have been changed according to the society, energy policy objectives and concerns. New and clean energy technologies are emerging as major contributors for the achievement of a set of imposed goals, being the energy efficiency combined with renewable energy sources (RES) a key strategy for a sustainable future. Powe...
Strategic electricity planning decisions
Pereira, Sérgio; Ferreira, Paula Varandas; Vaz, A. Ismael F.Sustainable electricity power planning involves trade-offs between multiple goals. The different attributes of each technology or generation portfolio in terms of the attainment of society goals must be assessed and included in the planning models. Optimization models always played an important role for supporting complex planning decision making, from which the particular case of the electricity industry stand...
A MPCC-NLP approach for an electric power market problem
Rodrigues, Helena Sofia; Monteiro, M. Teresa T.; Vaz, A. Ismael F.The electric power market is changing - it has passed from a regulated market, where the government of each country had the control of prices, to a deregulated market economy. Each company competes in order to get more clients and maximize its profits. This market is represented by a Stackelberg game with two firms, leader and follower, and the leader anticipates the reaction of the follower. The problem is for...
An MPCC approach on a Stackelberg game in an electric power market : changing t...
Rodrigues, Helena Sofia; Monteiro, M. Teresa T.; Vaz, A. Ismael F.An electric power market is formulated as a Stackelberg game where two firms, A and B, produce energy. Two distinct situations, according to the firm who plays the leader role, are analysed. In the first one, the firmA is the leader and the firm B is the follower, and in the second situation the players reverse their roles. In order to select the optimal strategy, the leader uses as knowledge his own perception...
Air pollution control with semi-infinite programming
Vaz, A. Ismael F.; Ferreira, E. C.Environment issues are more than ever important in a modern society. Complying with stricter legal thresholds on pollution emissions raises an important economic issue. This paper presents some ideas in the use of optimization tools to help in the planning and control of stationary pollution sources. Three main semi-infinite programming approaches are described. The first consists in optimizing an objective fun...
Modelling nearby FGK Population I stars: A new form of estimating stellar param...
Fernandes, João Manuel; Vaz, A. Ismael F.; Vicente, Luís NunesModelling a single star by means of theoretical stellar evolutionary tracks is a nontrivial problem due to the large number of unknowns compared to the number of observations. Currently, stellar age and mass are estimated using interpo- lations in grids of stellar models and/or isochrones assuming ad-hoc approximations for the mixing length parameter and the metal to helium enrichment, normally scaled on the so...
PSwarm: A hybrid solver for linearly constrained global derivative-free optimiz...
Vaz, A. Ismael F.; Vicente, L. N.PSwarm was developed originally for the global optimization of functions without derivatives and where the variables are within upper and lower bounds. The underlying algorithm used is a pattern search method, more specifically a coordinate search method, which guarantees convergence to stationary points from arbitrary starting points. In the (optional) search step of coordinate search, the algorithm incorporat...
A MPCC approach on a Stackelberg game in an electric power market : changing th...
Rodrigues, Helena Sofia; Monteiro, M. Teresa T.; Vaz, A. Ismael F.An electric power market is studied as a Stackelberg game where two firms, A and B, produce energy. It is analyzed two distinct situations, according to the firm who plays the leader role: the first one, when the firm A is the leader and the other firm is the follower, and the second that is the reverse of the players roles. The main goal is to understand the behavior of the various agents that compose the elec...
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