1 Department of Wind Energy, Technical University of Denmark2 Wind Energy Systems, Department of Wind Energy, Technical University of Denmark3 Department of Electrical Engineering, Technical University of Denmark4 Center for Electric Power and Energy, Department of Electrical Engineering, Technical University of Denmark5 Department of Informatics and Mathematical Modeling, Technical University of Denmark6 Dynamical systems, Department of Mathematics, Technical University of Denmark7 Karlsruhe Institute of Technology8 Department of Applied Mathematics and Computer Science, Technical University of Denmark
In this work, we present a homogenization method to model a stack of HTS tapes under AC applied transport current or magnetic field. The idea is to find an anisotropic bulk equivalent for the stack of tapes, where the internal alternating structures of insulating, metallic, superconducting and substrate layers are reduced while keeping the overall electromagnetic behavior. Our work extends the anisotropic bulk model originally presented by Clem et al. and later refined by Prigozhin and Sokolovsky. We disregard assumptions upon the shape of the critical region and use a power law E-J relationship allowing for overcritical current densities to be considered. The method presented here allowed for a computational speedup factor of up to 2 orders of magnitude when compared to full 2-D simulations taking into account the actual structure of the stacks without compromising accuracy.
Proceedings of International Conference on Coated Conductors for Applications (cca2012), 2012
Finite-element modeling; AC losses; coils; homogenization
Main Research Area:
International Conference on Coated Conductors for Applications (CCA 2012)