Objective To address the power fluctuations challenges arising from high-penetration renewable energy integration into the grid, this research aims to explore and advance gravity energy storage technology, with the goal of providing a reliable and large-scale electricity storage solution.
Method Based on cost control and multi-factor analysis, this study developed a modular design scheme for a single MW-level mountain slope gravity energy storage unit. This scheme was designed to be scalable to multi-track, multi-unit clusters.
Result System power exhibits a strong positive correlation with slope height. When power ≥ 1 MW, the maximum traction load on a single track may be less than the total mass of the active mass blocks. In such cases, a dual-motor configuration on a single track can be employed to share the load. Operating multiple tracks in parallel can overcome the capacity limitation of a single unit, enabling higher power output while simultaneously reducing the required individual mass block mass and overall system height. Cost analysis shows that for every 1 MW increase in power, the total cost increases by approximately 20%～30%.
Conclusion For MW-level systems, a parallel multi-track cycling design effectively enhances power output and optimizes economic performance. The modular scheme offers both scalability and engineering adaptability. Practical implementation requires comprehensive trade-offs considering power requirements, terrain conditions, equipment selection, and cost investment. Prioritizing higher slopes is recommended to balance efficiency with cost-effectiveness, thereby providing reliable support for renewable energy integration.
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