Speaker
Description
This paper centers around the scheme design and performance analysis of flux-coupling-type superconducting fault current limiters (SFCL) for inhibiting the cascading fault of AC/DC hybrid power grids. Firstly, it introduces the background and significance of researching the flux-coupling-type SFCL in the context of AC/DC hybrid power grids. The complex power flow characteristics and potential cascading fault risks in such grids necessitate practical fault current limiting measures. Subsequently, the design scheme of the flux-coupling-type SFCL, consisting of the superconducting coil and coupling transformer is elaborated. Regarding the superconducting coil design, the critical current density, magnetic field tolerance level, and temperature stability are carefully considered, and the structural style, tape length, and quenching resistance are optimized to improve the techno-economics. In addition, the winding type, core selection, and inductance values of the coupling transformer are determined. The flux-coupling-type SFCL’s performance under different operating conditions is evaluated through the electromagnetic transient simulation models. Results indicate that it demonstrates outstanding current limiting capabilities, capable of rapidly suppressing fault currents during cascading faults, thereby safeguarding the stability and reliability of the power grids. Moreover, the electromagnetic properties and AC loss of the flux-coupling-type SFCL are acceptable. Finally, the paper also points out the existing challenges and potential improvement directions in the practical application of the flux-coupling-type SFCL.
