Journal of Korea Society of Industrial Information Systems (한국산업정보학회논문지)

Korea Society of Industrial Information Systems (한국산업정보학회)
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Characteristic Analysis of Modularized HTS Field Coils for a Superconducting Wind Power Generator According to Field Coil Structure

계자 코일 구조에 따른 초전도 풍력 발전기의 모듈화 된 HTS계자 코일의 특성 분석

  • Received : 2019.01.08
  • Accepted : 2019.02.26
  • Published : 2019.04.30
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Abstract

High temperature superconducting (HTS) generators for wind power systems are attractively researched with the advantages of high efficiency and smaller size compared with conventional generator. However, the HTS generators have high Lorentz force problem, which acts on HTS field coils due to their high current density and magnetic field. This paper deals with characteristic analysis of the modularized HTS field coil for a 750 kW superconducting wind power generator according to field coil structure. The modularized HTS field coil structure was designed based on the electromagnetic and mechanical analysis results obtained using a 3D finite element method. The electromagnetic force of the module coil was also analyzed. As a result, the perpendicular and maximum magnetic fields of the HTS coils were 2.5 T and 3.9 T, respectively. The maximum stress of the supports was less than the allowable stress of the glass-fiber reinforced plastic material, and displacement was within the acceptable range. The design specifications and the results of the HTS module coil structure can be effectively utilized to develop large-scale superconducting wind power generators.

풍력발전 시스템용 고온 초전도 (HTS) 발전기는 높은 효율과 기존 발전기에 비해 작은 크기로 제작이 가능한 이점을 가지고 있다. 그러나 고온 초전도 발전기는 높은 전류 밀도와 자기장으로 인해 HTS 계자 코일에 작용하는 로렌츠 힘에 따른 문제가 발생할 수 있다. 본 논문에서는 계자 코일 구조에 따른 750 kW 급 초전도 풍력 발전기에 대한 모듈화 된 HTS 계자 코일의 특성 분석을 다룬다. 모듈화 된 HTS 필드 코일의 구조는 3D 유한 요소법을 사용하여 얻은 전자기 및 기계 분석 결과를 기반으로 설계하였고 모듈 코일의 전자기력도 분석하였다. 그 결과, HTS 코일의 수직 자기장과 최대 자기장은 각각 2.5 T와 3.9 T로 나타났다. 지지대의 최대 응력은 유리 섬유 강화 플라스틱 재료의 허용 응력보다 작았으며, 변위는 허용 범위 이내로 발생하였다. HTS 모듈 코일 구조의 설계 사양 및 결과는 대용량 초전도 풍력 발전기 개발에 효과적으로 활용될 수 있다.

Keywords

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Fig. 1 Design process of the HTS module coil for superconducting generator

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Fig. 2 Structural design of the HTS module coil

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Fig. 3 Ic - B curves of HTS wire

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Fig. 4 (a) Magnetic field distribution and (b) perpendicular magnetic field of the 750 kW HTS generator

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Fig. 5 (a) Output voltage and (b) rated torque of the 750 kW HTS generator

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Fig. 6 (a) Directions and (b) amplitude of the tangential and radial forces of the HTS field coil for the 750 kW HTS generator

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Fig. 7 (a) Tangential and radial forces of the HTS module coil, (b) Maximum tangential and radial forces of the HTS module coil

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Fig. 8 (a) Maximum stress and (b) displacement of the HTS module coil

Table 1 Specifications of the 750 kW HTS generator

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Table 2 Characteristics of the superconducting 2G HTS wire

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Table 3.Table 3 Detail specifications of the HTS module coil for the 750 kW HTS generator

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