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Communication Dans Un Congrès Année : 2015

Increase of stability margin in embedded DC electrical grid with superconducting stabilizer

Résumé

Embedded electrical grids are constantly subject to problems of stability. Some responses can be done with the help of resistive superconducting fault current limiters (RSFCL). In this paper, we propose a new system to enhance the stability of DC grid named Superconducting Stabilizer (SS). The SS uses the AC current component to increase the stability margin in DC grid. In fact, if the load increases beyond a threshold limit, the DC electrical grid becomes unstable and the current presents DC + AC components. When DC grid works at stable point, only DC current is present in the system. From the point of view of the SS, the fact that it is in its superconducting state induces very low losses in this case that can be negligible in comparison with other losses in DC grid. In the other case (instability case), the AC current component induces losses in the SS. In fact, the value of the AC current exceeds the Ic critical value of the superconducting element. It will be show that the increase of losses in the SS can stabilize the DC grid with efficiency. To obtain optimal results, the SS has to be designed with great accuracy. The measurements of Ic and AC loss of a superconducting tape are necessary. These measurements have been done with DI-BiSSCO tape and presented in this paper. From these measurements, the useful length of the tape is calculated from a specification of a typical embedded system. Simulations of DC grid instability are presented without and with SS to prove the effectiveness of the proposed superconducting element. Future work is to make real SS in real DC grid.
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Dates et versions

hal-01218207 , version 1 (20-10-2015)

Identifiants

  • HAL Id : hal-01218207 , version 1

Citer

Guan Bin Huang, Bruno Douine, Gaëtan Didier, Xin Hu, Babak Nahid-Mobarakeh, et al.. Increase of stability margin in embedded DC electrical grid with superconducting stabilizer. 24th International Conference on Magnet Technology - MT24, Oct 2015, Seoul, South Korea. page 93/2PoBL_12. ⟨hal-01218207⟩
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