Underground pumped storage system and method with abandoned mine as energy storage container

Abstract

The invention discloses an underground pumped storage system and method with an abandoned mine as an energy storage container. The abandoned mine is adopted as the energy storage container of the underground pumped storage system; the abandoned mine comprises an underground water return reservoir, a horizontal roadway and an underground goaf; a water inlet of an overground reservoir communicates with a water outlet of the underground water return reservoir through a first water pump unit, and a water inlet of the underground water return reservoir communicates with a water outlet of the overground reservoir through a first water turbine unit; the horizontal roadway is arranged between the underground water return reservoir and the underground goaf; the underground water return reservoir islower than the underground goaf, and the horizontal roadway communicates with the underground water return reservoir and the underground goaf; a second water pump unit and a second water turbine unitare arranged in the horizontal roadway, and the water inlet of the underground water return reservoir communicates with a water outlet of the underground goaf through the second water turbine unit; and the water outlet of the underground water return reservoir communicates with a water inlet of the underground goaf through the second water pump unit. According to the underground pumped storage system and method with the abandoned mine as the energy storage container, reliability, stability and high efficiency of an underground pumped storage power station with the abandoned mine as the energystorage container are achieved.

Description

technical field [0001] The invention relates to the field of energy storage, in particular to an underground pumped energy storage system and method using an abandoned mine shaft as an energy storage container. Background technique [0002] In recent years, with the rapid development of intermittent energy sources such as wind energy and solar energy, the accompanying problems of curtailment of wind and light, and the grid connection of intermittent energy have brought many problems to the control and safe operation of the existing power grid. It is necessary to meet the large-scale grid-connected demand of intermittent energy and ensure the safe operation of the grid; the peak-shaving capability of the grid determines the ability of the grid to accept intermittent energy. [0003] At present, the peak regulation of the power grid mainly relies on thermal power units, which has been unable to solve the problem of grid connection of intermittent energy sources. The reason is ...

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Problems solved by technology

The pumped storage system requires upstream and downstream reservoirs to store water, and the upstream and downstream reservoirs of the pumped storage system need to be dammed, and the dam will cause damage to the ecological environment and affect the local ecosystem; in addition, the pumped storage system There are also disadvantages such as high investment cost, long payback period, and poor economy. The above characteristics make pumped storage systems unable to be widely used

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