Evaluation of Heat Inleak in a Model Superconducting Coil Module for a Wind Turbine Generator With Iron Cores
Wind turbines larger than the present 5 MW class have recently been developed because adoption of larger capacity turbines can increase the total capacity of a wind farm. The realization of compact and lightweight superconducting direct-drive generators is desired. From a cost standpoint the salient...
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Veröffentlicht in: | IEEE transactions on applied superconductivity 2015-06, Vol.25 (3), p.1-5 |
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Sprache: | eng |
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Zusammenfassung: | Wind turbines larger than the present 5 MW class have recently been developed because adoption of larger capacity turbines can increase the total capacity of a wind farm. The realization of compact and lightweight superconducting direct-drive generators is desired. From a cost standpoint the salient-pole iron-core rotor design is superior, because it requires much less amount of expensive high-temperature superconducting (HTS) wires than air-core HTS rotors. In this study we have investigated how to compose a salient-pole 10 MW-class HTS rotor and selected a coil-module system with a warm iron core in which only the HTS racetrack coils are cooled. Based on basic consideration of the coil support system and the structure of the vacuum vessel, we fabricated a model coil module in which an approximately half-sized dummy coil made of copper bar is cooled in a doughnut-shaped vacuum vessel. Cooling tests using liquid nitrogen and liquid helium were successfully performed, and the amount of heat inleak was evaluated. We estimate that the heat inleak in a 10 MW rotor can be less than 500 W. |
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ISSN: | 1051-8223 1558-2515 |
DOI: | 10.1109/TASC.2014.2372779 |