| The use of fossil fuels has played a huge role in promoting the development and progress of human society,but at the same time it has also brought heavy pressure on the living environment of human beings.Increasing the research and development of renewable energy and increasing the energy efficiency of renewable energy is one of the effective ways to alleviate the environmental problems caused by the use of fossil fuels.However,intermittent and random volatility of renewable energy sources can easily cause grid voltage instability and the disappearance of system transient stability during grid connection.Large-scale energy storage technology can solve these problems,And brings considerable economic benefits.Relies on the demonstration project of liquefied air energy storage(LAES)led by the State Grid,carries out detailed thermodynamics research and analysis of the entire energy storage system,and provides a theoretical reference for future research on related technologies in China.1.Based on the basic principles of thermodynamics and the characteristics of the studied system,The concept of regional space has Proposed,and then establishes a complete thermodynamic cycle diagram of the system from a global perspective,and analyzes the factors that affect the cycle efficiency in a holistic manner.The measures to improve the efficiency of other systems,such as the proportion coefficient of the dry air cooler to provide cooling capacity,are reduced;The energy flow diagram of the system is established,the direction of the input energy of the system is analyzed as a whole,and the method of reducing the energy dissipation is given.2.The liquefied air energy storage system has divided three subsystems,establishes the thermodynamic model of the key equipment in each subsystem,and calculates the power consumption of each system based on the calculated energy consumption calculation algorithm;Energy efficiency indexes such as energy storage density,plant electricity rate,and electricity-electricity conversion efficiency were analyzed and calculated.At the same time,system useful energy analysis and multiple-status efficiency analysis were performed.3.In the end,A performance data acquisition and calculation and analysis system platform has established.Based on the principle of distributed acquisition technology in hardware,the overall design idea of the system platform is first proposed,then the acquisition scheme is formulated and the corresponding acquisition module is selected;On the basis of the idea of modular design,the module isconfigured on the overall framework of the system platform,and the function of each module in the framework has analyzed. |
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