Measuring, Control and Protection of HTS Magnet for a 1 MJ/0.5 MVA SMES

Abstract:

An 1 MJ/0.5 MVA high-Tc SMES has been developed by the Institute of Electrical Engineering, Chinese Academy of Sciences. It has been operating in a real power grid since February 16, 2011 in Baiyin City, Gansu Province in northwest China. The SMES magnet is immersed in liquid helium and cooled by four G-M cryo-coolers to keep zero helium vaporization. To ensure safe operation of the system, protection of the HTS magnet is a necessity, which, however, cannot be complemented by only single protection. In this paper, coordinate protection of the system is introduced by an online measuring and control system and a power conversion unit, and the control principle is described in detail. By means of the coordinate protection, the temperature and pressure inside the SMES Dewar are controlled in the range of 4.3-4.5 K and 0.01~0.025 MPa, respectively. Long term demonstration of the SMES during a period of more than two years shows that the coordinate protection can ensure a stable and reliable operation of the HTS magnet.

• Periodical: Applied Mechanics and Materials (Volume 521)
• Pages: 742-747
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.521.742
• Online since: February 2014
• Authors: Shao Tao Dai, Zhi Qin Zhu*, Yu Ping Teng, Li Ye Xiao, Jing Ye Zhang, Wen Yong Guo, Zhi Yuan Gao, Nai Hao Song, Zhi Feng Zhang, Qing Quan Qiu, Guo Min Zhang, Liang Zhen Lin
• Keywords: Cryogenic Dewar, HTS Magnet, Online Measuring and Control System, Power Conversion Unit

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