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Este artigo é uma introdução à Análise do Discurso da Sociologia do Conhecimento (ADSC). Trata-se de uma abordagem da pesquisa discursiva dentro das ciências sociais que goza de antiga recepção no espaço de língua alemã e recentemente também em âmbito internacional. Essa abordagem combina a análise de regimes de saber/poder postulada por Foucault com o paradigma interpretativo da sociologia, em especial com a tradição pragmática do interacionismo simbólico e da sociologia do conhecimento social-construtivista. São apresentados importantes conceitos fundamentais, além de sugestões para a metodologia e a aplicação metódica de estudos discursivos correspondentes.
Statistical physics of power flows on networks with a high share of fluctuating renewable generation
(2010)
Renewable energy sources will play an important role in future generation of electrical energy. This is due to the fact that fossil fuel reserves are limited and because of the waste caused by conventional electricity generation. The most important sources of renewable energy, wind and solar irradiation, exhibit strong temporal fluctuations. This poses new problems for the security of supply. Further, the power flows become a stochastic character so that new methods are required to predict flows within an electrical grid. The main focus of this work is the description of power flows in a electrical transmission network with a high share of renewable generation of electrical energy. To define an appropriate model, it is important to understand the general set-up of a stable system with fluctuating generation. Therefore, generation time series of solar and wind power are compared to load time series for whole Europe and the required balancing or storage capacities analyzed. With these insights, a simple model is proposed to study the power flows. An approximation to the full power flow equations is used and evaluated with Monte-Carlo simulations. Further, approximations to the distributions of power flows along the links are analytically derived. Finally, the results are compared to the power flows calculated from the generation and load data.