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Multiphysics lumped-parameter model of high temperature superconducting power cables for DC and AC applications
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DOI：10.1088/1361-6668/ae43d8.png)
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Abstract
En 中文
Superconducting cables are promising technologies to address the challenges posed by the growing demand for electrical power in the world. Their high current capacity in conjunction with their compact size are beneficial qualities for applications in highly urbanized areas with the extra capability to handle electrical overloads. However, the use of superconductors in power systems is still in an early stage. The superconductors are themselves in evolution, and so are their modeling. In addition to the real-size components already installed in power grids, accurate models are essential to study the behavior of superconducting devices under different operating scenarios, and so to promote the acceptance of the technology in the electrical sector. The present ongoing work introduces two modeling strategies to achieve this goal. They address both rated operations and transient perturbations in DC and AC systems that incorporate high-temperature superconducting (HTS) coaxial power cables. The first is a classic lumped-parameter model (LPM) familiar to power system analysts, whereas the second relies on a 2D finite element model (FEM) with electrical circuit coupling (FEM-EC). The simulation results were compared with experimental data acquired from DC characterizations and AC loss measurements on three REBCO mock-up cables (MC) in liquid nitrogen at 77.3 K. This study was numerically extended considering a fully layered coaxial cable based on the design of the MC to allow cross-checking the electromagnetic response of the LPM with the previously validated FEM-EC. The LPM is shown to provide comparable results within an acceptable relative error compared to the more refined FEM-EC. Furthermore, it was found that the FEM is needed to capture the actual current density distribution across the width of the HTS tapes in subcritical AC operations so that the proper resistance of the superconductor could be fed to the LPM.
Keywords:
superconducting cables
high-temperature superconductors
lumped-parameter model
finite element model
power systems
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