Publications by Frédéric Sirois

Resistivity of REBCO tapes in overcritical current regime: impact on superconducting fault current limiter modeling

Francesco Grilli, Nicolo' Riva, Bertrand Dutoit, Frédéric Sirois, Bertrand Dutoit

A detailed knowledge of the resistivity of high-temperature superconductors in the overcritical current regime is important to achieve reliable numerical simulations of applications such as superconducting fault current limiters. We have previously shown t ...

2020

Status of the European Union Project FASTGRID

Bertrand Dutoit, Frédéric Sirois, Bertrand Dutoit, Mathias Noe

High voltage direct current super-grids are one attractive solution for the transmission of bulk power of renewable electricity over long distances. Their protection is still an issue and superconducting fault current limiters (SCFCL) offer attractive pers ...

IEEE Institute of Electrical and Electronics Engineers2019

Evaluation of the Applicability of Phenomenological HTS Models for Numerical Analysis of Quenches in Coated Conductors: Simulations vs. Experiments

François Roy, Frédéric Sirois, Bertrand Dutoit, Bertrand Dutoit

The electrical resistivity of coated conductors is strongly related to the inter-dependent set of parameters (J, H, T), respectively current density, magnetic field and temperature. On the one hand, it is difficult to isolate the contribution of each of th ...

IEEE Institute of Electrical and Electronics Engineers2011

Impact of Inhomogeneities in HTS Coated Conductors for Resistive FCLs

Frédéric Sirois, Daniele Colangelo, Bertrand Dutoit, Bertrand Dutoit

Several issues remain to be addressed for the commercial development of ResistiveFault Current Limiters based on superconducting technologies (RFCL). In particular, the inhomogeneity of high temperature superconducting coated conductors (HTS-CC) combined w ...

Elsevier Science Bv2011

Assessment of the Computational Performances of the Semi-Analytical Method (SAM) for Computing 2-D Current distributions in Superconductors

François Roy, Frédéric Sirois, Bertrand Dutoit, Bertrand Dutoit

The semi-analytical method (SAM) is a fast integral technique for solving small 2-D, time-transient electromagnetic problems in high temperature superconductors (HTS) with transport current and/or applied field. The method in itself is a generalization of ...

IEEE Institute of Electrical and Electronics Engineers2009

Quench propagation in coated conductors for fault current limiters

François Roy, Frédéric Sirois, Bertrand Dutoit, Bertrand Dutoit

A fundamental understanding of the quench phenomenon is crucial in the future design and operation of high temperature superconductors based fault current limiters. The key parameter that quantifies the quenching process in superconductors is the normal zo ...

Elsevier2009

Numerical studies of the quench propagation in coated conductors for Fault Current Limiters

François Roy, Frédéric Sirois, Bertrand Dutoit, Bertrand Dutoit

A fundamental understanding of the quench phenomenon is crucial in the future design and operation of HTS based Fault Current Limiters (FCLs). The key parameter that quantifies the quenching process in superconductors is the normal zone propagation (NZP) v ...

IEEE Institute of Electrical and Electronics Engineers2009

Evaluation of two commercial finite element packages for calculating AC losses in 2-D high temperature superconducting strips

Francesco Grilli, François Roy, Frédéric Sirois, Bertrand Dutoit, Bertrand Dutoit

This paper compares the speed and accuracy of two commercial packages based on the finite element method (FEM) for calculating the AC losses in high temperature superconductors (HTS). The softwares investigated in this paper were COMSOL Multiphysics and FL ...

2008

Magneto-thermal finite element modeling of 2nd generation HTS for FCL design purposes

Francesco Grilli, François Roy, Frédéric Sirois, Bertrand Dutoit, Bertrand Dutoit

Coated conductors are very promising for the design of novel and e±cient Fault Current Limiter (FCL). However, before considering using them in a power grid, their thermal and electromagnetic behaviors in the presence of over-critical currents need to be i ...

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2008

Magneto-Thermal Modeling of Second-Generation HTS for Resistive Fault Current Limiter Design Purposes

Francesco Grilli, François Roy, Frédéric Sirois, Bertrand Dutoit, Bertrand Dutoit

Coated conductors are very promising for the design of novel and efficient resistive Fault Current Limiters (FCLs). However, a detailed knowledge about their thermal and electromagnetic behaviors in the presence of over- critical currents is crucial for th ...

IEEE Institute of Electrical and Electronics Engineers2008