Joint energy storage system and method with air and water as energy storage working media

Abstract

The invention discloses a joint energy storage system and method with air and water as energy storage working media. The system comprises an air compression energy storage unit, an air expansion energy release unit, a water energy storage unit, a water energy release unit, an energy release logic judgment unit and a heat storage circulation loop. According to the system and method, based on optimal matching of an air and water joint containing cabin and a heat storage / heat exchange device, by means of the acting characteristic of compressible / incompressible fluid, pressure energy stored by high-pressure air is released in a staged manner for continuous power generation; a water turbine is preferentially utilized for release power generation, acting is achieved through an air expander after residual pressure air absorbs compression heat, and classification gradient efficient utilization of pressure energy and heat energy stored in the compression energy storage process is achieved; and compared with the traditional compression air energy storage technology, according to the system and method, the electric conversion efficiency of the energy storage system and the fast response capacity to power grid control are effectively improved, supplemental combustion and contamination are avoided, and an effective path of achieving clean, efficient and economical large-scale energy storage is achieved.

Description

technical field [0001] The invention belongs to the field of large-scale electric energy physical energy storage, and in particular relates to a large-scale and efficient combined energy storage system based on compressed air energy storage technology combined with water energy storage / energy release. Background technique [0002] Judging from the current level of technological development, compressed air energy storage technology (CAES) and pumped storage technology are the only two technologies that can realize large-scale storage of electric energy. Compressed air energy storage technology has been applied and developed abroad for more than 30 years, and it is still operating safely today. Representative power stations include the compressed air energy storage power station built by the Alabama Power Company in the United States in the McIntosh area and the Hunterf compressed air energy storage power station in Germany. [0003] According to the technical characteristics...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a combined energy storage system and method using air and water as energy storage working medium to solve the problems of slow response time and low conversion efficiency of electric energy in traditional compressed air energy storage; the present invention uses compressed air energy storage Technology-based, combined with the use of water energy storage / energy release to achieve large-scale, high-efficiency joint energy storage; the invention realizes the classified utilization of energy, and does not require supplementary combustion and is pollution-free

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