A double-shell pumped storage system

Abstract

The invention relates to a double-shell type pumped storage system which comprises an impounding reservoir and a low-pressure water-gas co-containing cabin, wherein the impounding reservoir is connected with the water inlet of the low-pressure water-gas co-containing cabin through a valve and a water pump unit; the water outlet of the low-pressure water-gas co-containing cabin is connected with the impounding reservoir through another valve and a hydraulic generator unit; the hydraulic generator unit is connected with a generator; a high-pressure gas storage tank is arranged at the bottom of the low-pressure water-gas co-containing cabin so as to form a double-shell structure; the high-pressure gas storage tank is connected with a compressor unit, a bidirectional turbocharger and the cavity in the upper part of the low-pressure water-gas co-containing cabin through valves respectively; the compressor unit is connected with an engine; the bidirectional turbocharger is connected with a motor; the bidirectional turbocharger is communicated with the cavity in the upper part of the low-pressure water-gas co-containing cabin. Due to adoption of the double-shell structure of the double-shell type pumped storage system, the investment of a high-pressure container can be lowered, the recycling year limit of an energy storage system can be shortened, constant pressure inside the low-pressure water-gas co-containing cabin can be maintained in the energy storage and release process, stable output of electric power can be ensured, and relatively high system efficiency can be achieved.

Description

【Technical field】 [0001] The invention relates to the field of energy storage, in particular to a double-shell pumped water storage system. 【Background technique】 [0002] With the rapid development of wind power generation, the energy storage system, as a transitional system between the power plant and the power grid, has attracted much attention in recent years. Among them, the pumped storage system has been studied by various countries due to its simple structure, high operating efficiency, and no pollution. identified as the most likely system for large-scale application. [0003] A pumped storage system usually consists of an upper reservoir, a lower reservoir, water delivery and power generation equipment, and there is a certain height difference between the upper and lower reservoirs. During the period of abundant wind energy, the wind turbine is driven by wind energy, and generates electric energy through generators and other auxiliary equipment. This part of electr...

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Problems solved by technology

[0005] During the energy storage process of the constant-pressure water-gas co-containment cabin power energy storage system, the pressure of the gas in the water-gas co-containment cabin continues to rise, and the water pump unit works under variable working conditions, and the operating efficiency is reduced; and in the power generation process A certain amount of steam needs to be added from the outside to maintain a constant pressure of the gas in the cabin and output stable electric energy.

Due to the high temperature of water vapor, the safety of the co-containment cabin will be reduced to a certain extent, and the corrosion of the water-gas co-containment cabin will be accelerated; in addition, the research team’s research on the constant pressure water-gas co-containment cabin electric energy storage system Further research found that the water-gas co-containment chamber required by the energy storage system is a high-pressure vessel, and the investment cost is huge, which greatly increases the payback period of the system and reduces the operating economy. The solubility in water will increase sharply, and these dissolved gases will cause serious cavitation of turbine blades, which will cause major safety accidents

The problems faced by the constant pressure water-air co-containment electric energy storage system largely restrict the large-scale commercial application of the system. Therefore, it is necessary to develop a new pumped storage system with high efficiency, constant pressure and good economy. Essential for large-scale and efficient use of wind energy

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