Print Email Facebook Twitter Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines Title Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines Author Liu, D. (TU Delft DC systems, Energy conversion & Storage) Polinder, H. (TU Delft DC systems, Energy conversion & Storage) Abrahamsen, Asger B. (Technical University of Denmark) Ferreira, Jan Abraham (TU Delft ESE Programmes) Date 2017-05-25 Abstract This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting generators must have significant advantages over permanent magnet direct-drive generators, which typically have shear stresses of the order of 53 kPa and efficiencies of 96%. Therefore, we investigate what excitation is required to obtain a doubled shear stress and an efficiency of 98%. To achieve this, the different topologies require a range of excitation from 200 to 550 kAt (ampere-turns) with a low armature current density of 2 A/mm2. The more iron that is used in the core of these topologies, the easier they achieve this performance. By examining the maximum magnetic flux density at the location of the superconducting field winding, feasible superconductors can be chosen according to their engineering current density capabilities. It is found that high- and low-temperature superconductors can meet the performance criteria for many of the topologies. MgB2 superconductors are feasible for the fully iron-cored topology with salient poles but need cooling down to 10 K. Subject Direct drivehigh temperature superconductor (HTS)low temperature superconductor (LTS) To reference this document use: http://resolver.tudelft.nl/uuid:adc422cd-2dfc-4f18-b288-c7be4a5bcbf5 DOI https://doi.org/10.1109/TASC.2017.2707661 ISSN 1051-8223 Source IEEE Transactions on Applied Superconductivity, 27 (5), 1-11 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2017 D. Liu, H. Polinder, Asger B. Abrahamsen, Jan Abraham Ferreira Files PDF Potential_DLiu_final_subm ... EEE_2_.pdf 1.81 MB Close viewer /islandora/object/uuid:adc422cd-2dfc-4f18-b288-c7be4a5bcbf5/datastream/OBJ/view