Study On Carbon Emission And Energy Consumption In Wind Farm Operation

In order to address the global warming risk and follow the development pathways of low-carbon economy,global efforts has been made to develop clean energy vigorously and to focus carbon mitigation.The power sector is the largest CO₂ emissions source in China.It is mainly because the energy structure of China's power sector is dominated by coal.Therefore,the development of clean energy power generation has become the priority in China's power sector.As a clean energy source,wind power is of great significance for air pollution mitigation and energy saving.However,from the whole perspective on wind farm operation,wind power cannot achieve a zero emission.In wind turbine's lifecycle,the stages of production,transportation,construction,operation,maintenance,and waste disposal,the energy consumption and carbon emission cannot be avoided,and thus affects the environment.Therefore,in order to study the carbon emissions and energy consumption in the whole process of wind farms comprehensively,system dynamics method is used to establish a dynamic model to simulate CO₂ emissions and energy consumption in wind farms,perform uncertainty analysis,and provide basis for energy saving and emission reduction of wind farms.This study used Vensim DSS software to calculate the life cycle CO₂ emissions and energy consumption of wind farms.The results show that the total amount of CO₂ emission,energy consumption,the CO₂ emission intensity,the energy consumption intensity,the energy consumption intensity,the energy return ratio,and the energy payback time of the wind farm is 89532 t,556.37 TJ,11.26 g CO₂/k Wh,0.0701 MJ/k Wh,51.32,1.51 years,respectively.In the stage of production and transportation,infrastructure construction,operation and maintenance,and waste disposal,CO₂ emissions accounts for 89.62%,43.86%,12.75% and 46.24%,respectively,and energy consumption accounts for 113.95%,68.60%,6.17% and-88.72%,respectively.The calculation results show that the large consumption of materials during the whole process of the wind farm is the main reason for the huge amount of CO₂ emissions and energy consumption.The CO₂ emissions and energy consumption in the wind turbine production and transportation stage account for the largest proportion,and the resource recovery during the waste disposal stage has an inhibitory effect on CO₂ emissions and energy consumption.Compared with the power plants with the same generating capacity,this wind farm can reduce CO₂ emissions by 6.605 million tons.Uncertainty analysis and sensitivity analysis show that,improving the ability of wind farm emergency response and unit maintenance efficiency that aim to increase the effective power generation time,improving the production process and wind farm construction technology,reducing the CO₂ emission coefficient and energy consumption coefficient of all materials,reducing the consumption of materials in the whole process,and increasing the recovery rate of the metal materials,can significantly reduce CO₂ emissions and energy consumption.They are effective technical methods to promote energy conservation and carbon mitigation of wind farms and make wind power a cleaner energy source.