To read the full version of this content please select one of the options below:

Comparison of first‐ and second‐order 2D finite element models for calculating AC loss in high temperature superconductor coated conductors

Mark D. Ainslie (Department of Electrical Engineering, University of Cambridge, Cambridge, UK)
Tim J. Flack (Department of Electrical Engineering, University of Cambridge, Cambridge, UK)
Zhiyong Hong (School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University Shanghai, Shanghai, People's Republic of China)
Tim A. Coombs (Department of Electrical Engineering, University of Cambridge, Cambridge, UK)

Abstract

Purpose

The purpose of the paper is to provide a comparison of first‐ and second‐order two dimensional finite element models for evaluating the electromagnetic properties and calculating AC loss in high‐temperature superconductor (HTS) coated conductors.

Design/methodology/approach

The models are based on the two‐dimensional (2D) H formulation, which is based on directly solving the magnetic field components in 2D. Two models – one with a minimum symmetric triangular mesh and one with a single‐layer square mesh – are compared based on different types of mesh elements: first‐order (Lagrange – linear) and second‐order (Lagrange – quadratic) mesh elements, and edge elements.

Findings

The number and type of mesh elements are critically important to obtain the minimum level of discretization to achieve accurate results. Artificially increasing the superconductor layer and choosing a minimum symmetric mesh with triangular edge elements can provide a sufficiently accurate estimation of the hysteretic superconductor loss for a transport current.

Originality/value

This paper describes how the selection of mesh type and number of elements affects the computation speed and convergence properties of the finite element model using two different types of meshing. It offers an insight into the different factors modelers must consider when modeling HTS coated conductors and the methods that may be applied when extending the model to complex device geometries, such as wound coils.

Keywords

Citation

Ainslie, M.D., Flack, T.J., Hong, Z. and Coombs, T.A. (2011), "Comparison of first‐ and second‐order 2D finite element models for calculating AC loss in high temperature superconductor coated conductors", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 30 No. 2, pp. 762-774. https://doi.org/10.1108/03321641111101195

Publisher

:

Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited