| In the current situation with large energy consumption,shortage of traditional energy,and the great damage caused by pollution products,clean and efficient renewable energy is a key development direction for the future power generation industry.However,The inherent deficiencies of intermittent and fluctuating of the mature renewable energy power generation technologies such as wind power and photovoltaic/photothermal power generation have led to the phenomenon of "wind abandoning","light abandoning".The phenomenon of abandonment and grid connection difficulties have greatly restricted the further development of renewable energy power generation and large-scale commissioning.In addition,the increasing peak-to-valley difference has also increased the difficulty of peak and frequency regulation of power grids and generator sets.Energy storage technology,by virtue of its ability to store and transfer electrical energy on time and space scales,has the functions of "peak shaving and valley filling",stabilizing power output,and balancing power loads,which can solve the above problems jointly.Therefore,energy storage technology has also received more and more attention.This paper first taked the development history of compressed air energy storage technology as the main line,analyzed in detail the different types of compressed air energy storage and its research status,and pointed out the significance of heat storage technology to promote the further development of compressed air energy storage technology and the main problems existing in the current research.The working principle and type of the thermal storage system were further analyzed,and the thermodynamic model of each component and important parameters of the thermal storage system was established.Then a simulation model of the thermal storage system was established in Simulink to study the effect of operating parameters of the heat exchangers,heat accumulators,and power pumps in the thermal energy storage system on system parameters during operation.The efficiency of the heat exchanger,the temperature of the inlet thermal energy storage medium during the compression and expansion stages,and the pump efficiency of the power pump were selected as the changing operating parameters.And the compressor power consumption,expander output power,pump power consumption,heat loss,loss of function of the heat storage medium,system cycle efficiency and heat storage efficiency were selected as the research objects.The simulation was used to analyze the influence of operating parameters on the research objects.In addition,the quantitative relationship between the heat exchange capacity in the heat exchanger and the compressor power consumption and expander output power,and the relationship between pressure drop in heat exchanger and system cycle efficiency are further analyzed.Finally,a detailed compressed air energy storage economic calculation and evaluation model was established based on the life cycle cost.Take the 10MW/80MW·h advanced adiabatic compressed air energy storage system as an example,calculate the project’s construction,operating costs and financial benefits.Perform the same economic calculation on the traditional compressed air energy storage system under the same capacity,and analyze the impact of the addition of the thermal energy storage system on the economics of the compressed air energy storage system.Through sensitivity analysis,the factors that have the greatest impact on the costs and benefits of the project,as well as the indicators that are vulnerable and riskier in the project,were obtained.And through the feasibility critical point analysis,the variable range of the influencing factors was obtained.Select advanced adiabatic compressed air energy storage systems with different capacities as a control unit to perform economic calculations and analyze the impact of unit capacity on system economics. |
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