Research on power generation efficiency and stabilization strategies for vertical gravity energy storage

doi:10.19799/j.cnki.2095-4239.2024.0304

Abstract

Abstract:

As a novel energy storage technology that has emerged in recent years, vertical gravity energy storage offers benefits such as flexible site selection and environmental sustainability. However, research on its internal system remains limited, and studies on key technical indicators like system efficiency and power stabilization are still underdeveloped. This paper addresses these gaps by developing physical models for vertical gravity energy storage systems, including an efficiency model and a power model. For the efficiency model, the study identifies sources of loss and examines how efficiency varies with parameters such as the mass of heavy objects, maximum velocity, acceleration through simulation. The results show that maximum velocity, acceleration, and shaft height have a significant impact on the efficiency of the system, while the mass of heavy objects has a minimal impact. Reducing the maximum velocity and shaft height can notably enhance system efficiency. The power model introduces a multi-channel power superposition method to realize stable power output through power compensation. This method employs staggered start-up techniques to realize power superposition. The study simulates power output under various control strategies and evaluates performance based on power fluctuation rate and power loss rate. The results show that increasing the number of channels effectively reduces power fluctuations, with fluctuations dropping to only 2.5% when the number of channels reaches 8. Additionally, power loss rate decreases with more channels and stabilizes beyond 4 channels. Increasing the number of channels can effectively improve the external output power performance of the system.

Key words: vertical gravity energy storage, system efficiency, power stability, control strategy

CLC Number:

TK 02

Rui ZHOU, Jianfeng HONG, Junci CAO, Wei QIN, Zhuoyue ZHAO. Research on power generation efficiency and stabilization strategies for vertical gravity energy storage[J]. Energy Storage Science and Technology, 2024, 13(10): 3556-3565.

Figures/Tables 19

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Table 1

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通道数	平均输出功率/MW	功率波动率/%	功率损失率/%
2	41	17.8	51
3	41	22.3	26.8
4	41	6	24.6
6	41	4.6	27.6
8	41	2.5	24.9

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