Curvas de cargas típicas, velocidade do vento e energia eólica no Nordeste do Brasil.

Abstract

On this study were evaluated the annual energy curve from 2009 to 2012 and the typical daily energy demand curve on winter and summer months of 2009, and the relationship with the wind speed at the same time-scale, in northeastern Brazil, to verify the possibility of use the wind power generation in the months and times of maximum energy demand as an alternative source to supplement the energy generated by hydropower. The results revealed similar patterns for the annual energy demand curve on the Northeast Subsystem, in the last four years, with an evident growth year by year which was 7.6 , 8.4 and 14.9 % for 2010 , 2011 and 2012 compared with the cumulative annual for 2009. For the years was verified an increase on the energy demand during spring and summer months. The daily load curves for typical days in June and December showed a higher consumption of electricity in December , both during the day and night , and the lowest in June, months that represent the seasons of summer and winter in the region , respectively. The predominant wind direction for all months of the year ranged between northeast and southeast in all the capitals of the Northeast , with annual average wind speed above 3.0 m/s in the Rio Grande do Norte, Ceará and Alagoas states, and only 1.6 m/s in Piauí. From January 2009 to December 2012 , the annual cycles showed similar seasonality between the years, with monthly average more intense in the second half of each year, which were up to 5.8 m/s , recorded in Parnaíba, Piauí coast, however the more and weak intense vary from one year to another. In the case of hourly values for the months December and June 2009, the winds were more intense during the day, with values of up to 7.9 m/s, checked in São Luis during December.