Optimization of an HTS Stator Winding for WECS

Superconducting generators can possibly give a compact and lightweight drive train at high torques and low rotational speeds since high magnetic fields can be created [8]. Among these superconducting generators, fully superconducting machines are more advantageous than others because of their high power density and efficiency.
In this thesis, a major focus is on optimizing the stator winding for a 10 MW fully superconducting offshore wind turbine synchronous generator (FSWTG), with High-Temperature Superconductors (HTS) used in both the stator and rotor winding. This study is part of the SuperGenSys project at Fraunhofer IEE, Kassel, which aims to design, optimize, and evaluate the 10 MW fully HTS generator. Due to the relationship between the critical current and the flux density, the performance of machines with HTS armature and field windings can be more sensitive to design parameters than conventional electrical machines. The effect of stator geometry on the machine with HTS armature windings is explored in this work [22].
In a fully superconducting generator, defining the armature winding entails making a key design decision. Therefore, an investigation is performed for the 10 MW FSWTG with four different armature windings (one and two-layer concentrated winding, air-gap winding, and one-layer distributed winding). To analyze the behavior of the 10 MW FSWTG at different ampere loading and operating temperatures, a detailed design and analysis has been carried out in this study to select the suitable winding concept using the FEM software called FEMAG-DC.