KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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AC Loss Analysis of 10 MW Class Fully High Temperature Superconducting Synchronous Generators with Dual Field Windings

이중계자를 갖는 10 MW급 전초전도 동기 발전기의 교류손실 해석

  • Park, Sang Ho (Department of Energy and Electrical Engineering, Korea Polytechnic University) ;
  • Lee, Myeonghee (Department of Energy and Electrical Engineering, Korea Polytechnic University) ;
  • Lee, Seyeon (Department of Energy and Electrical Engineering, Korea Polytechnic University) ;
  • Yang, Hyung Suk (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Kim, Woo-Seok (Department of Energy and Electrical Engineering, Korea Polytechnic University) ;
  • Lee, Ji-Kwang (Department of Energy Electrical Engineering, Woosuk University) ;
  • Choi, Kyeongdal (Department of Energy and Electrical Engineering, Korea Polytechnic University)
  • Received : 2020.04.29
  • Accepted : 2020.09.24
  • Published : 2020.12.30
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Abstract

The superconducting synchronous generator is one of the breakthrough elements for direct-drive wind turbines because it is light and small. Normally the superconducting one has copper armature windings in the stator and superconducting field windings on the rotor. The high resistance of the armature can make large copper losses, comparing with the conventional generators with a gear box. One of the solutions for the large copper losses could be a fully superconducting generator. But the high magnetic fields from the superconducting field windings on the rotor also make high perpendicular magnetic fields on the superconducting tapes in the armature windings. We have proposed a fully superconducting synchronous generator with dual field windings. It could immensely decrease the circumferential component of the magnetic field from the field windings at the armature windings. In this paper, we conceptually designed 3 types of superconducting synchronous generators. The first one is the fully superconducting one with conventional structure, which has superconducting armature windings in the stator and superconducting field windings on the rotor. The second one is the one with dual superconducting field windings and superconducting armature windings between them. The last one is the same as the third one except the structure of the armature. If the concentrated armature windings are superconducting ones with cryostats, then they cannot be installed within the span of 2 poles. So, we adopted 3 phases windings within 4 poles system. It makes more AC losses but can be manufactured really.

Keywords

Acknowledgement

This work was supported by Korea Electric Power Corporation under Grant R17XA05-34.

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