This article presents the power dissipation analysis on saturated iron-core superconducting fault current limiter (SISFCL). The modeling of SISFCL together with its power dissipation computation on high-temperature superconducting (HTS) coil were executed by the H-formulation model implemented into the finite-element method (FEM) software package COMSOL. The model was based on the practical threephase 35 kV/90 MVA SISFCL. The AC magnetic field in the crucial parts of SISFCL was studied to discover the origin of power loss on HTS coil. The instantaneous power dissipations in the HTS coil with increasing DC bias current were computed and compared. Analysis proved that power dissipation in the HTS coil of SISFCL should be taken into account for the real operation.  Index Terms-Saturated iron-core superconducting fault current limiter (SISFCL), High-temperature superconducting (HTS) coil, Power dissipation, AC loss, Finite element analysis.

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This paper presents an electromagnetic design of a permanent magnet superconducting wind power generator with different stator teeth structures and armature winding arrangements. The main contribution of this work is that a novel stator configuration is proposed, which is beneficial for superconducting machines. The topology of tapering poles makes it possible for the machine to carry larger current without severe magnetic saturation in the stator teeth. Meantime, the distributed arrangement of wires in the stator slot can reduce the AC loss in the same output power condition. Finite element analysis with commercial software is used to support these results.

This paper mainly focuses on the comparison of electromagnetic performance of the superconducting permanent magnet (SCPM) generators with two different topologies. The torque capabilities of the two generators are first investigated. The peak torque is largely restricted by the material characteristics of the SC and the permanent magnet (PM). It turns out that the SCPM generators with iron-cored rotor and iron-cored stator topology (IRIST) is superior to the one with iron-cored rotor and air-cored stator topology (IRAST) in terms of torque capability. Furthermore, the flux density, line electromotive force (EMF), torque and its torque ripple, and the efficiency of the designed generators are evaluated by using numerical model. The simulation results confirm that IRIST has higher output torque and efficiency with the penalty of higher harmonics and torque ripples.  Index Terms-Finite element method (FEM); superconducting permanent magnet wind power generator; topology; comparison

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