Presentation Information
[APP2-10]Evaluation of Current Distribution in kA-Class SMES Cables with Parallel Windings of REBCO Coated Conductors
*Tomoya Miyazaki1, Kohei Higashikawa1, Takanobu Kiss1, Michio Sato2, Kei Shiohara2 (1. Kyushu University (Japan), 2. SWCC Corporation (Japan))
Keywords:
SMES
We have proposed a superconducting cable with an energy storage function (SMES cable), which can simultaneously transmit electric power and mitigate output fluctuations from renewable energy sources. For practical applications, kiloampere-class current capacity must be achieved by connecting multiple REBCO coated conductors in parallel, but such configurations raise a critical issue: current distribution among conductors is not always uniform due to variations in joint resistance and inductive coupling, which may limit the effective current capacity of the cable. In this study, a kA-class SMES cable composed of parallel REBCO windings was fabricated and experimentally investigated. The current in each strand and its frequency dependence were measured and analyzed, and the results were compared with analytical estimations based on measured inductance matrices. This analysis clarified how resistive and inductive effects influence current sharing. Furthermore, extrapolation to practical kilometer-scale cables was performed, and the resulting current distribution under representative operating conditions was evaluated, demonstrating nearly uniform current sharing especially for a typical operating frequency such as 0.1 Hz. These findings indicate that the proposed parallel winding method is a promising approach for realizing large-current SMES cables and highlights their potential for stabilizing renewable energy fluctuations in power grids, offering a practical solution for future energy storage and transmission applications.