Compressed air water pumping energy storage system

Abstract

The invention discloses a compressed air water pumping energy storage system. The compressed air water pumping energy storage system comprises an air compression unit, an air expansion pressure stabilizing unit, a hydraulic turbine set, a pumping unit, a high-pressure air storage tank, a medium-pressure air storage tank, a high-pressure water storage tank and a normal-pressure water storage tank, wherein the medium-pressure air storage tank, the air compression unit and the high-pressure air storage tank are connected in sequence so as to form an energy storage channel; the high-pressure air storage tank, the air expansion pressure stabilizing unit, the high-pressure water storage tank, the hydraulic turbine set and the normal-pressure water storage tank are connected in sequence so as to form an energy releasing channel; and the normal-pressure water storage tank, the pumping unit and the high-pressure water storage tank are connected in sequence so as to form a water return channel. According to the compressed air water pumping energy storage system, the air storage tanks are used as air storage containers, so that the problem of difficulty in site selection of underground caverns of a traditional compressed air energy storage system is avoided, high-position water is replaced with high-pressure water, and the gravity head of water is replaced with the pressure head of water, so that the dependence of a traditional water pumping energy storage power station on the ground potential difference is eliminated.

Description

Technical field [0001] The invention relates to the technical field of power storage, in particular to a compressed air pumping and energy storage system. Background technique [0002] With the continuous growth of my country's power grid capacity, the peak-to-valley gap continues to increase. Some power grids have had to adopt compulsory power cuts due to the existence of peak power supply shortages. This not only hinders the development of productivity, but also may cause Bringing social problems, so the introduction of energy storage systems into the power grid is an urgent need to achieve power grid peak shaving. In addition, with the vigorous development of renewable energy, distributed energy supply and smart grids, the actual demand for large-scale development of the energy storage industry is also increasing. [0003] Conventional energy storage technologies mainly include flywheel energy storage, battery energy storage, superconducting energy storage, super capacitor energ...

AI Technical Summary

Problems solved by technology

Due to the high cost of battery energy storage and the problems of environmental pollution in production and subsequent treatment, it is currently difficult to promote it to the field of large-scale energy storage

As the most mature large-scale energy storage application technology at present, pumped water storage has the advantages of high efficiency, large energy storage capacity, and mature equipment technology.

Compressed air energy storage stores energy in the form of air internal energy, but traditional compressed air energy storage technology needs to use underground salt caverns as gas storage space, which also has the problem of difficult site selection

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