Loading experiment and thermal analysis for conduction cooled magnet of SMES system

doi:10.1007/s11460-009-0028-8

Front Elect Electr Eng Chin

2009, Vol. 4

Issue (2) : 214-219 https://doi.org/10.1007/s11460-009-0028-8

RESEARCH ARTICLE

Loading experiment and thermal analysis for conduction cooled magnet of SMES system

Gang WU^1,2(

), Huiling WANG¹, Jiangbo XIE¹, Yan ZHAO¹, Yuejin TANG¹, Jindong LI¹

1. Research Institute of Cryogenics, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Department of Mechanical Engineering, Naval University of Engineering, Wuhan 430033, China

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Abstract

China’s first 35 kJ high temperature superconducting magnetic energy storage (SMES) system with an experiment equipment was depicted. The dynamic heat analysis of the magnet of the SMES was conducted through the current load test on the directly cooled conduction magnet. The research results were as follows: when the converter charges and discharges the magnet for energy storage, the hysteresis loss is the main part of power loss, and contributes significantly to temperature rise; reducing the current frequency at the side of direct current is conducive to restraining temperature rise. The optimizing factors of the cool-guide structure were analyzed based on the heat stability theory, and it was found that the heat transfer of its key part (at the top of the magnet) must be strengthened to reduce the axial temperature difference of the magnet.

Keywords conduction cooled superconducting magnetic energy storage (SMES) magnet current load thermal analysis

Corresponding Author(s): WU Gang,Email:w_G977@tom.com

Issue Date: 05 June 2009

Cite this article:

Gang WU,Huiling WANG,Jiangbo XIE, et al. Loading experiment and thermal analysis for conduction cooled magnet of SMES system[J]. Front Elect Electr Eng Chin, 2009, 4(2): 214-219.

URL:

https://academic.hep.com.cn/fee/EN/10.1007/s11460-009-0028-8
https://academic.hep.com.cn/fee/EN/Y2009/V4/I2/214

Fig.1 Conduction cooling system of SMES (1. magnet, 2. radiating shield, 3. cryostat, 4. second stage cooling head of cryocooler B, 5. first stage cooling head of cryocooler B, 6. binary current lead, 7. cooling head of cryocooler A, 8. flexible conducting frame, 9. down conducting board, 10. conducting copper flakes, 11. conducting rods, 12. upper conducting board)

Fig.2 Cooldown curves of magnet
Cryogenic measuring system of SMES (1. magnet, 2 & 3. radiating shield, 4. cryostat, 5 & 13. conduction strap of radiating shield, 6. magnet down conducting board, 7. flexible conducting frame, 8. cooling head conducting board, 9. cooling head of cryocooler A, 10. current lead, 11 & 15. binary current leads, 12. second stage cooling head of cryocooler B , 14. first stage cooling head of cryocooler B, 16. ice-barrel, 17. connection points, 18. digital temperature receiver, 19. computer, 20. switch, 21. digital voltage receiver, 22. digital temperature display instrument, 23. vacuum instrument)

Fig.3

Fig.4 Electric resistance of superconducting coils in cooldown course

Fig.5 Voltage and current in measurement

Fig.6 Temperature of magnet upside during measurement

Fig.7 Temperature of magnet underside during measurement

Fig.8 Temperatures of magnet upside and underside during dynamic current loading

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