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

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

References

[1] Wang H L, Rao R S, Li J D, Tang Y J, Cheng S J, Pan Y. Progress on cryogenic technology applied in superconducting electric engineering. Automation of Electric Power Systems, 2001, 25(17): 65–68 (in Chinese)

[2] Liu Z H. AC Loss and Stability of Superconducting Magnet. Beijing: National Defense Industry Press, 1992, 83 (in Chinese)

[3] Tasaki K, Ono M, kuriyama T. Study on AC losses of a conductive cooled HTS coil. IEEE Transactions on Applied Superconductivity, 2003, 13(2): 1565–1568

[4] Wang J X. Superconducting Magnet. Beijing: Atomic Energy Press, 2003, 150 (in Chinese)

[5] Brechna H. Superconducting Magnet Systems (in Chinese, trans. Jin Dechang). Beijing: Science Press, 1986

[6] Dresner L. Quench energies of uncooled superconductors. Cryogenics, 1994, 34(1): 77–82

[7] Li J, Xu D H, Cheng K W E, Tang Y J. Carrier-swapping method to equalize current in a multi-modular current source converter for SMES. Proceedings of the CSEE, 2004, 24(7): 106–111 (in Chinese)

[8] Wu G, Wang H L, Tang S M. Temperature field simulation and experiment research for 35 kJ HTS magnet of superconducting magnetic energy storage (SMES). In: Proceedings of 2006 Conference of Refrigeration and Cryogenics Engineering, 2006, 10

[9] Wang H L, Wu G. A conduction cooling device application to HTS magnet. China Patent, <patent>CN2731650</patent>, 2005-10-05

Acknowledgements

This work was supported by the Hi-Tech Research and Development Program of China (No. 2002AA306331-4), the National Natural Science Foundation of China (Grant No. 51076013), the Research Fund for the Doctoral Program of Higher Education of China (No. 200040487039).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg