| Energy is a motive force of the development of modern society.Economy is developing fast in our country since the reform and opening up,the energy demand is rising steadily.Large-scale exploitation and utilization of petrochemical energy brings climate change,serious environmental pollution and other issues.In the development and utilization of renewable energy,wind energy is one of the fastest growing clean energy.The development and utilization of wind energy helps to improve the energy structure,reducing greenhouse gas emissions and the environmental pollution caused by using fossil fuels.Yangtze river delta is not only China’s economic center with the strongest comprehensive strength,but also the global important manufacturing base.Its energy consumption is huge,basically relies on other provinces and cities to support.In recent years,due to the large scale of fossil energy use,air pollution and fog weather is increasingly serious,so using the region’s wind energy resources is of great significance.In the development and utilization of wind energy resources,the energy assessment is a prerequisite and infrastructure for the construction of wind farms.It is very important to accurately know well the state of wind in the height of wind generator turbine.The existing wind resource assessment technology mainly has two kinds:based on the observation data of meteorological station history evaluation,the numerical simulation of the wind energy resource assessment.Meteorological observatories only give wind speed of 10 meters height above ground,distance between station and station is far,leading to low resolution level of observation data,and as a result of the influence of urbanization,Urban meteorological observatory measured wind speed is smaller than the actual wind speed.Using numerical simulation method of wind resources assessment can conquer these problems.WRF(weather research and forecasting)is a new generation of mesoscale meteorological model developed by many scientific research units of USA.The wind speed of the Yangtze River Delta region is simulated by WRF model from October 1 to October 31 on 2010.One month of wind energy data calculated from WRF outputs are analyzed and interpolated to study geographical distribution at 70 m,100 m,1000 m,3000m,6000 m,10000 m height above ground respectively.Simulation results show that the surface layer distribution of wind energy are greatly influenced by topography and underlying surface types.High-altitude wind can ignore the influence of terrain,high-altitude wind energy density is large,almost 100 times the number of the surface layer. |
