Design and Feasibility Study of a Performance Evaluation System for a Large-Scale HTS Generator Under Short-Circuit Conditions

Abstract

Generally, in a high temperature superconducting (HTS) generator, a large magnetic air gap exists because of needed space for a cryostat or non-magnetic cores in the HTS generators. Consequently, the inductance becomes lower than conventional generators. As a result, the short circuit current becomes as high as more than 10 times the rated current. The design of the mechanical structure of a generator is very challenging to endure a high force and torque at the HTS field coils. Therefore, a performance evaluation system (PES) is required to test the HTS field coil and support structures of the generator. In this paper, the design and feasibility study of a PES for and HTS field coil of large-scale HTS generator are presented. The 10 MW class HTS generator and PES was designed based on the electromagnetic analysis results obtained using the finite element method. The torque and force of the HTS field coil were analyzed. As a result, the HTS field coil can be practically tested using the proposed PES whether the structure of the coil can withstand the high torque and force of the generator. The proposed PES design and short-circuit analysis results can be effectively used for the development of large-scale HTS wind power generation systems.