Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (3): 835-845.doi: 10.19799/j.cnki.2095-4239.2022.0634

• Energy Storage System and Engineering • Previous Articles     Next Articles

Study on factors influencing rail gravity energy storage system efficiency

Tingting QIN1,2(), Xuezhi ZHOU1,2,3, Dingzhang GUO1,2, Yong SHENG1, Yujie XU1,2, Zhitao ZUO1,2,3, Hui LI1,2,3, Haisheng CHEN1,2,3()   

  1. 1.Institute of Engineering Thermophysics, Chinese Academy of Science, Beijing 100190, China
    2.University of Chinese Academy of Science, Beijing 100049, China
    3.National Energy Large Scale Physical Energy Storage Technologies R&D Center of Bijie High-tech Industrial Development Zone, Bijie 551712, Guizhou, China.
  • Received:2022-10-31 Revised:2022-11-14 Online:2023-03-05 Published:2023-04-14
  • Contact: Haisheng CHEN E-mail:qintingting@iet.cn;chen_hs@iet.cn

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: