Composite energy storage system based on deep well

Abstract

The invention belongs to the technical field of mechanical energy storage, and aims to solve the problem that the existing technology cannot realize efficient and safe large-capacity energy storage, and specifically relates to a composite energy storage system based on a deep well, including a control system, a deep well, a heavy object module, a gravity Lifting device, flow conversion device and compressed air energy storage device; gravity lifting device includes support components, trusses, beams and motor generators; beams are movably connected to trusses; motor generators are movably mounted on beams; compressed air energy storage The device includes a movable sealing device for controlling the opening and closing of the deep well preset chamber and a conversion device for controlling the conversion of compressed air potential energy and electric energy; the conversion device includes an air compressor, an expander, an air inlet pipe, an air outlet pipe, The air valve and the air outlet valve, the air compressor communicate with the preset well cavity through the inlet pipe; the expander communicates with the preset well cavity through the air outlet pipeline; the invention occupies a very small area, has a large energy storage, low cost and high 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] Vigorously developing renewable energy and realizing clean energy transformation is an important way to achieve carbon peaking and carbon neutrality, and it is also a major trend in the energy field today. 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 realizat...

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 EnergyVault uses multi-arm tower cranes and concrete prefabricated blocks to stack concrete cement prefabricated blocks with multi-arm tower cranes alternately and non-stop to build blocks at high altitudes, thereby completing the storage and release of electric energy and gravity; although this technical solution stores energy Large, but stacked high concrete prefabricated blocks on the ground are greatly affected by wind and other weather, and there is a risk of collapse

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