Overall energy efficiency analysis and calculation method for vertical shaft type gravity energy storage system

By analyzing the phased charging and discharging cycle process of a vertical gravity energy storage system, the problem of quantitatively evaluating the energy conversion efficiency of the vertical gravity energy storage system is solved, providing a theoretical basis for system design and economic evaluation, and improving the accuracy of engineering design.

CN121858832APending Publication Date: 2026-04-14CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP CO LTD
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Patent Information

Application Number
CN202511914431.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-18
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

The lack of quantitative analysis of the overall energy conversion efficiency of vertical gravity energy storage systems in existing technologies limits their feasibility studies and market promotion in engineering projects.

Method used

By dividing the charging and discharging cycle of the vertical gravity energy storage system into multiple stages, dynamic equations and energy conversion equations are established, the energy change values ​​of each stage are calculated, and the overall energy conversion efficiency of the system is calculated in combination with system efficiency parameters.

Benefits of technology

This study enables quantitative analysis of the entire process of energy input and output from the grid side in a vertical shaft gravity energy storage system, providing a theoretical basis for system design optimization and economic evaluation, and guiding engineering design.

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Abstract

The invention relates to the technical field of vertical shaft type gravity energy storage systems, in particular to a vertical shaft type gravity energy storage system overall energy efficiency analysis and calculation method which comprises the steps that the complete charging and discharging circulation of a vertical shaft type gravity energy storage system is divided into a plurality of stages according to the movement path of a gravity medium; aiming at the charging state, establishing a kinetic equation and an energy conversion equation of the gravity medium in the horizontal transportation and vertical lifting process, solving to obtain an energy change value of each stage, and obtaining the total energy of the charging process; aiming at the discharge state, establishing a kinetic equation and an energy conversion equation of the gravity medium in the horizontal transportation and vertical descending processes, solving to obtain an energy change value of each stage, and obtaining the total energy of the discharge process; and obtaining the overall energy conversion efficiency of the system based on the total energy of the discharging process and the total energy of the charging process. The calculation method provided by the invention realizes the quantitative analysis of the whole process of the vertical shaft type gravity energy storage system from the power grid side input energy to the power grid side output energy.
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