Modularization of the HTS Field Coils for a Large-Scale Superconducting Generator

In general, when a high-temperature superconducting (HTS) field coil breaks down, the overall field coils of a superconducting synchronous generator (SCSG) also stop working because the HTS field coils are connected in series. However, the modularized HTS field coil is operated individually, and thus, if the HTS field coils break down, the generator still operates even under the fault conditions. This paper deals with the modularization of the HTS field coils for a large-scale superconducting generator. The conceptual design of the modularized large-scale HTS generator was designed by using a 3-D CAD program based on electromagnetic and force analysis results. The output characteristics of the HTS generator were analyzed using a 3-D FEM program. The conceptual design of the modularized HTS field coils and fault characteristics analysis results of a 12-MW-class superconducting generator are discussed in detail.