Numerical modelling of MgB2 conductors for high power AC transmission

TL;DR

This paper uses finite-element simulations to analyze and optimize MgB2 superconducting cables for high-power AC transmission, focusing on minimizing AC losses through various design configurations.

Contribution

It introduces a detailed numerical model incorporating superconductor and magnetic material properties to evaluate AC losses in MgB2 cables, aiding design optimization.

Findings

AC losses depend on cable configuration and magnetic properties.

Finite-element simulations effectively predict current and field distributions.

Design optimization can reduce AC losses in MgB2 cables.

Abstract

Cables made of MgB2 superconductors are currently explored as a viable solution for transporting high electrical power in the AC regime. In order to be competitive against the DC solution, the cables need to have an acceptable level of AC losses. In this contribution, we discuss the main aspects relevant for designing a cable with a sufficiently low AC loss level. To this end, we perform finite-element-method (FEM) simulations to determine the current and field distributions and calculate the AC losses of such cable configuration. For current capacities of 2-5 kA (peak), power cables are assembled from a relatively small number of MgB2 strands. The performance of such cables strongly depends on the current and field distributions, which are in turn influenced by the number and the arrangement of the superconducting components and also by the magnetic properties of supporting materials. Numerical simulations can help to test different cable configurations and provide important insights for optimizing the cable's design. The numerical model includes the field dependence of the superconductor's critical current density Jc(B) as well as the non-linear properties of magnetic materials.