Study on factors influencing rail gravity energy storage system efficiency

doi:10.19799/j.cnki.2095-4239.2022.0634

Abstract

Abstract:

Energy storage is an important supporting technology for constructing a new power system with new energy as the main body, which is of great significance to achieving the goal of carbon peak and carbon neutrality. Rail gravity energy storage belongs to physical energy storage, which has the advantages of large scale, low cost, high efficiency, eco-friendly, and no self-discharge, resulting in broad application prospects. In this study, a rail gravity energy storage system model was built based on MATLAB/Simulink, and the energy loss of each component of the system in the energy storage and energy release processes were analyzed. The influence of factors such as the mass of the vehicle, the speed of the vehicle, the inclination of the slope, the height of the slope, and the rolling friction coefficient on the system efficiency and their variation rules were studied. These factors significantly reduce the speed and rolling friction coefficient, and increase the slope and height appropriately, resulting in an efficient system. Under these design conditions, the load vehicle of 160 t the speed of 20 km/h, the slope of 200 m, the slope of 7°, and the rolling friction coefficient of 0.006 was achieved. The corresponding system output power and efficiency are 1.04 MW and 76.20%, respectively.

Key words: energy storage technology, physical energy storage, gravity energy storage, rail gravity energy storage

CLC Number:

TK 02

Tingting QIN, Xuezhi ZHOU, Dingzhang GUO, Yong SHENG, Yujie XU, Zhitao ZUO, Hui LI, Haisheng CHEN. Study on factors influencing rail gravity energy storage system efficiency[J]. Energy Storage Science and Technology, 2023, 12(3): 835-845.

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部件	参数	数值	部件	参数	数值
载重车辆	满载质量/t	160	永磁同步电机	直交电感/mH	0.3e-3
	上坡速度/(km/h)	20		交轴电感/mH	0.3e-3
	下坡速度/(km/h)	20		转动惯量/(kg·m²)	35000
	轮轨滚动摩擦系数	0.006		额定转矩/(N·m)	173586
	静摩擦系数	0.408		额定转速/(rad/s)	5.82
	车轮直径/m	1.05		定子电阻/Ω	0.006
	主减速器变比	0.55		转子磁链/Wb	1.48
	迎风面积/m²	3		电机效率	0.96
	传动效率	0.96	双向PWM型变换器	变流器效率	0.97
山体斜坡	高度/m	200		额定容量/MVA	1.5
山体斜坡	坡度/(°)	7		直流侧电压/V	1150

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