Generation of electric energy through wind turbines is one of the practically inexhaustible alternatives of generation. It is considered a source of clean energy, but still needs a lot of research for the development of science and technologies that ensures uniformity in generation, providing a greater participation of this source in the energy matrix, since the wind presents abrupt variations in speed, density and other important variables. In wind-based electrical systems, it is essential to predict at least one day in advance the future values of wind behavior, in order to evaluate the availability of energy for the next period, which is relevant information in the dispatch of the generating units and in the control of the electrical system. This paper develops ultra-short, short, medium and long-term prediction models of wind speed, based on computational intelligence techniques, using artificial neural network models, Autoregressive Integrated Moving Average (ARIMA) and hybrid models including forecasting using wavelets. For the application of the methodology, the meteorological variables of the database of the national organization system of environmental data (SONDA), Petrolina station, from 1 January 2004 to 31 March 2017, were used. A comparison among results by different used approaches is also done and it is also predicted the possibility of power and energy generation using a certain kind of wind generator.
The aim of this article is to present a systematic review of the literature on urban logistics and its stakeholders and identify future research directions. In order to discuss the main contributions and trends of this theme, a combination of bibliometric analysis techniques, semantic and content and a technological prospection were performed. Through the evaluation of a sample group of seventy one articles, it was possible to trace paths and understand content approaches, identifying advantages, limitations and conditions for the good development of city logistics and its agents. Based on these findings, the low evidence of how effectively each of the stakeholders influencing the activities of city logistics stands out, since your heterogeneity and conflict of interest are singled out as the cause of the difficulty of this deployment. It is important to note that from the technological prospection was possible to identify the state of innovation on the world stage in the area studied.
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