Composite energy storage system based on deep well

Abstract

The invention belongs to the technical field of mechanical energy storage, aims to solve the problem that high-efficiency and safe large-capacity energy storage cannot be realized in the prior art, and particularly relates to a composite energy storage system based on a deep well. The system comprises a control system, the deep well, a weight module, a gravity lifting device, a converter device and a compressed air energy storage device, wherein the gravity lifting device comprises a supporting assembly, a truss, a cross beam and a motor generator; the cross beam is movably connected with the truss; the motor generator is movably arranged on the cross beam; the compressed air energy storage device comprises a movable sealing device used for controlling opening and closing of the deep well preset cavity and a conversion device used for conducting conversion control over potential energy and electric energy of compressed air; the conversion device comprises an air compressor, an expansion machine, an air inlet pipeline, an air outlet pipeline, an air inlet valve and an air outlet valve, wherein the air compressor is communicated with the preset well cavity through the air inlet pipeline; and the expansion machine is communicated with the preset well cavity through the air outlet pipeline. The system is extremely small in occupied area, high in energy storage capacity, low in manufacturing cost and high in safety.

Description

technical field [0001] The invention belongs to the technical field of mechanical energy storage, and in particular relates to a composite energy storage system based on deep wells. Background technique [0002] It is a major trend in today's energy field to vigorously develop renewable energy and realize clean energy transformation. However, renewable energy power generation is greatly affected by climatic conditions, resulting in large fluctuations, and poor adjustment and inertia support capabilities. Its large-scale grid connection will affect the real-time power balance and stability of the grid, resulting in curtailment of wind and light. And so on. Energy storage technology can effectively solve the problems of space-time mismatch and grid-connected stability, and is an important guarantee for the large-scale and efficient development and utilization of renewable energy and the realization of my country's green and sustainable energy development strategy. As more an...

AI Technical Summary

Problems solved by technology

Typical cases include: ①Scotland Gravitricity Company used electric winches to lift the gravity energy storage of abandoned drilling rigs based on abandoned mines (see Science, 2021, 372 , 446 for details); The utilization rate of underground space is very limited, resulting in limited energy storage, limited available abandoned mines, and lack of flexibility in site selection

②Switzerland Energy Vault uses dobby tower cranes and concrete prefabricated blocks to stack concrete cement prefabricated blocks with dobby tower cranes alternately and non-stop to build blocks at high altitudes, thereby completing the storage and release of electric energy and gravity; The energy is high, but the concrete prefabricated blocks stacked very high on the ground are greatly affected by wind and other weather, and there is a risk of collapse

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