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Advances in Condensed Matter Physics
Volume 2018 (2018), Article ID 9735795, 9 pages
https://doi.org/10.1155/2018/9735795
Research Article

Pareto-Optimization of HTS CICC for High-Current Applications in Self-Field

ENEA C. R., 00044 Frascati, Italy

Correspondence should be addressed to Giordano Tomassetti; ti.aene@ittessamot.onadroig

Received 13 September 2017; Revised 23 November 2017; Accepted 7 December 2017; Published 28 January 2018

Academic Editor: Ying Xu

Copyright © 2018 Giordano Tomassetti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The ENEA superconductivity laboratory developed a novel design for Cable-in-Conduit Conductors (CICCs) comprised of stacks of 2nd-generation REBCO coated conductors. In its original version, the cable was made up of 150 HTS tapes distributed in five slots, twisted along an aluminum core. In this work, taking advantage of a 2D finite element model, able to estimate the cable’s current distribution in the cross-section, a multiobjective optimization procedure was implemented. The aim of optimization was to simultaneously maximize both engineering current density and total current flowing inside the tapes when operating in self-field, by varying the cross-section layout. Since the optimization process involved both integer and real geometrical variables, the choice of an evolutionary search algorithm was strictly necessary. The use of an evolutionary algorithm in the frame of a multiple objective optimization made it an obliged choice to numerically approach the problem using a nonstandard fast-converging optimization algorithm. By means of this algorithm, the Pareto frontiers for the different configurations were calculated, providing a powerful tool for the designer to achieve the desired preliminary operating conditions in terms of engineering current density and/or total current, depending on the specific application field, that is, power transmission cable and bus bar systems.