Performance Analysis of Distributed HTS Armature Winding Direct Drive Wind Generator With Active Magnetic Shielding Layer

High-temperature superconducting (HTS) electrical machine has higher torque density and higher efficiency than permanent magnet electrical machine, showing a great application prospect in the field of offshore wind power generation. However, if there is applied magnetic field acting on the wide plane of HTS tape perpendicularly, the current-carrying capacity of the HTS tape will be greatly reduced, resulting in the performance limitation of the HTS electrical machine. In order to reduce the negative effect of the applied magnetic field on the HTS tape, this paper proposes a new distributed HTS armature winding direct drive wind generator (DHTSAW-DDG) with active magnetic shielding layer. In this paper, the topology and working principle of the DHTSAW-DDG is clearly illustrated, meanwhile, the basic electromagnetic performances of the DHTSAW-DDG are carefully analyzed and compared with the counterpart with the copper armature winding. The results show that the active magnetic shielding layer made of HTS material can significantly weaken the negative effect of the applied magnetic field on the current-carrying capacity of the HTS tape. The electromagnetic performance of the HTS electrical machine can be significantly improved, if the distributed HTS armature winding and the active magnetic shielding layer are adopted. The torque density and the power factor of the proposed DHTSAW-DDG with active magnetic shielding layer can increase approximately 40% than the copper armature winding electrical machine with same topology.