Optimal Scheduling Of Power System Considering Compressed CO₂ Storage And Wind Power Considering Flexibility

In response to the climate change caused by excessive greenhouse gas emissions,China has proposed the "dual carbon" strategic goals of achieving carbon peaking before 2030 and carbon neutrality before 2060.As the largest source of carbon emissions in China,the power industry’s carbon reduction process has a decisive impact on whether the "dual carbon" goals can be achieved as scheduled.To achieve carbon reduction targets,it is necessary to increase the proportion of clean energy such as wind power in electricity generation.However,this will inevitably lead to problems such as insufficient flexibility.Therefore,this paper studies the compressed carbon dioxide energy storage and wind power coordination scheduling problem considering flexibility.Firstly,typical flexibility configurations such as accident reserves,fast reserves,and shortterm operating reserves of domestic and foreign power grids are analyzed,and a flexibility analysis framework is designed.Taking a provincial power grid as an example,based on analyzing its operating characteristics,the paper studies the power grid operation under different decarbonization scenarios.From the perspectives of operating costs and the proportion of output of various types of power sources,the paper analyzes the methods to improve the flexibility of the power grid,and studies the important role of various energy storage methods such as compressed carbon dioxide energy storage in improving the flexibility of the power grid.Secondly,the compressed carbon dioxide energy storage system model is studied,and the operating framework of typical compressed carbon dioxide energy storage systems is analyzed.The energy storage process,energy release process,heat storage tank working process,and gas storage tank working process are sequentially modeled.On this basis,a variable operating condition dynamic efficiency model of the compressed carbon dioxide energy storage system is established from the perspective of power system optimization and scheduling,and is linearized in sections.Finally,the paper studies the coordinated scheduling of compressed carbon dioxide energy storage and wind power considering flexibility,incorporates the established model into the high wind power penetration rate power system optimization and scheduling model considering flexibility,and uses the IEEE 14-node model in the safety-constrained unit combination research framework to verify the effectiveness of the established model and analyze the role of compressed carbon dioxide energy storage in improving the flexibility of low-carbon power grids.