A NUMERICAL STUDY OF WIND SPEED-UP OVER HYDROELECTRIC RESERVOIRS OF THE SOUTHEAST REGION OF BRAZIL

Cláudio de Castro Pellegrini, Almilson Vilhena Leite Neto, João Victor Burgareli de Assis, Arcilan Trevenzoli Assireu

Abstract


Brazil has a large hydric potential explored in many ways, especially for electrical generation. However there is a lack of studies about the wind acceleration a converge over the reservoir, affected by the surrounding topography and the low roughness of the water surface. In this work an evaluation of the phenomenon is performed thought observed data and numerical simulation using the WRF atmospheric model. The selected reservoirs are located in the Brazilian south-east region, and both have operating infrastructure of transmission. In view of that, we have tried to understand the influence of the joint reservoir-topography over the wind behavior. It was verified that in the Itumbiara reservoir (Goias State), the wind experiences acceleration with both cross and aligned wind with respect to the reservoir branches. Otherwise, the Tres Marias reservoir (State of Minas Gerais) shows that in the case of non-aligned wind the reservoir has not a significant influence over wind speed. It is concluded that for both reservoirs wind speed-ups are verified, caused by the joint reservoir- topography influence, that becomes more evident with speeds over 3.0 m/s (10 m over the ground) a velocity matching modern wind turbines cut out speed.


Keywords


Wind potential. Mesoscale modeling. WRF model. Hydroelectric reservoirs.

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DOI: http://dx.doi.org/10.5902/2179460X20170

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