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Investigation of Numerical Modeling Techniques for Gas-Cooled Superconducting Power Devices

机译：气冷超导功率器件数值建模技术研究

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摘要

Global energy demands are on the rise, and the current technology used to generate, transmit, and distribute electricity will not be able to meet the growth due to the bottlenecks in densely populated areas and the inefficiencies throughout the electrical grid. Soon, new technologies will be required to relieve the constraints on the grid while being cost effective, reliable, and environmentally acceptable. High temperature superconducting (HTS) technology being developed has the means to provide ways to overcome the challenges faced by electric utility companies. Other applications including all-electric ships and aircrafts would also benefit greatly from the use of HTS power devices in meeting the increasing electrical power requirements at high power densities.;HTS power technology is relatively complex, and it involves multiple technological and scientific disciplines besides the materials being expensive currently to enable cost-effective applications. Therefore, intensive numerical modeling efforts are necessary to improve the designs and system level optimizations so that the technology will be commercially viable. The goal of the research described here is to investigate and develop effective methods of modeling and simulating HTS power devices cooled with gaseous helium (GHe) circulation. The technique of GHe-cooled HTS power systems is relatively new, and there is much room for improvements in designs, particularly integrating the superconducting and cryogenics systems. Benefits of modeling the systems in detail include reduced cost and time and the ability to perform optimizations; each of which would allow faster development cycles at lower cost. These benefits arise from the fact that it's more efficient to design complex systems using bits as opposed to atoms.;A 30-m long HTS power cable including the cable terminations and the cryogenic helium circulation system is the primary system studied in this work. GHe offers some important benefits over liquid nitrogen including improved safety in confined spaces and lower operating temperatures especially for superconducting applications that require high power densities such as those to be used on all-electric Navy ships. However, there are still some challenges that need to be addressed. GHe possesses lower heat capacity per unit volume compared to liquid cryogens, and its weak dielectric strength currently restricts its use in HTS power cables at low and medium voltage applications.;This dissertation describes numerical modeling techniques including volume element methods and finite element methods that were developed to visualize the physics of several different HTS cable system components. The modelling techniques developed were further utilized for transient analysis of the cryogenic thermal and electrical behavior under various scenarios and system operational contingencies to assess the limitations of the technology and to devise methods for mitigating the contingencies.
机译：全球能源需求正在上升，由于人口稠密地区的瓶颈以及整个电网的效率低下，目前用于发电，输电和配电的技术将无法满足增长需求。不久，将需要新技术来减轻对电网的限制，同时又要具有成本效益，可靠性和环境可接受性。正在开发的高温超导（HTS）技术提供了克服电力公司所面临挑战的方法。在满足高功率密度下不断增长的电力需求方面，HTS功率设备的使用也将极大地受益于其他应用，包括全电动船舶和飞机。HTS功率技术相对复杂，除了涉及到许多技术和科学领域外目前，材料成本很高，以实现具有成本效益的应用。因此，需要大量的数值建模工作来改进设计和系统级优化，以便该技术在商业上可行。本文所述研究的目的是研究和开发有效的方法，以建模和模拟用气态氦（GHe）循环冷却的HTS功率设备。 GHe冷却的HTS电力系统技术相对较新，并且在设计方面还有很多改进的空间，特别是将超导和低温系统集成在一起。对系统进行详细建模的好处包括降低成本和时间以及执行优化的能力；每一个都可以以更低的成本实现更快的开发周期。这些好处来自以下事实：使用位而不是原子设计复杂的系统更为有效。这项工作研究的主要系统是30米长的HTS电力电缆，包括电缆终端和低温氦循环系统。 GHe在液氮方面具有一些重要优势，包括改善密闭空间的安全性和降低运行温度，尤其是对于要求高功率密度的超导应用，例如全电动海军舰船。但是，仍然有一些挑战需要解决。与液态制冷剂相比，GHe的单位体积热容更低，并且其较弱的介电强度目前限制了其在中低电压应用的HTS电力电缆中的应用。本文介绍了数值建模技术，包括体积元法和有限元法。开发以可视化几种不同的HTS电缆系统组件的物理情况。所开发的建模技术被进一步用于在各种情况和系统运行意外情况下对低温热和电行为进行瞬态分析，以评估该技术的局限性并设计缓解意外情况的方法。

著录项

  • 作者

    Suttell, Nicholas George.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 105 p.
  • 总页数 105
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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