Parameter coupling design method for liquefied air energy storage system

Abstract

The invention provides a parameter coupling design method for a liquefied air energy storage system. The parameter coupling design method is implemented through at least one processor, a memory in communication connection with the processor and a computer readable storage medium storing computer programs. According to the invention, the maximization of the electricity-electricity conversion efficiency of the system is taken as a design target.Main parameters such as liquefied air energy storage pressure, main compressor / circulating compressor working stages, a main compressor / circulating compressor interstage cooling scheme, a compression heat recycling scheme and cold box high-pressure side outlet air temperature are used as optimization variables; aspen Plus process simulation software is adopted for system thermal simulation, the design process can be effectively simplified, and the design time is greatly shortened. According to the liquefied air energy storage system parameter coupling design method provided by the invention, by comprehensively considering the mutual influence among the unit-unit, the parameter-parameter and the unit-parameter of the liquefied air energy storage system, long-term reliable, stable and efficient operation of the energy storage system under variable working conditions of variable operation parameters, variable external parameters and the likecan be realized.

Description

technical field [0001] The invention belongs to the technical field of renewable energy power generation and energy storage, and in particular relates to a parameter coupling design method of a liquefied air energy storage system. Background technique [0002] Renewable energy represented by wind energy and solar energy has inherent defects such as intermittency and volatility, which contradict the long-term stability requirements of power grid operation, resulting in a large number of abandoned wind and light. Therefore, there is an urgent need for large-scale electric energy storage technology to solve the problem of difficult grid integration of renewable energy. As a large-scale energy storage technology, air liquid energy storage has many advantages such as high energy storage density, long working life, high safety level, and flexible site selection. It is considered to be one of the most promising energy storage technologies. [0003] The liquefied air energy storage...

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Problems solved by technology

[0003] The liquefied air energy storage system consists of a series of thermal processes such as compression, liquefaction, heat storage, cold storage, gasification, and expansion. A great challenge has come, and a systematic, efficient and reasonable parameter optimization design method is urgently needed

However, most of the current research only involves the parameter optimization design of a single device, and fails to consider the interaction between unit-unit, parameter-parameter, and unit-parameter in the system, and lacks an efficient coupling design method for multiple parameters of the system

On the other hand, since the air liquefaction energy storage system is a year-round operating system, its operating conditions are easily affected by changes in the real-time power of renewable energy power generation and environmental weather. How to ensure the efficient and stable operation of the energy storage system under variable working conditions is also the same face many difficulties

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