L. Levacher's research while affiliated with Électricité de France (EDF) and other places
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Publications (7)
Pour rester compétitive, l’industrie doit se transformer et améliorer ses performances ; face aux exigences de ses clients, elle doit aussi se décarboner. EDF accompagne ses clients industriels dans leur transformation numérique et environnementale.
A few years ago, the study and simulation of fast power system
phenomena in real-time, was the private ground of analog simulators. But
the limitation in modeling, the complexity and the costly maintenance of
these simulators was a brake upon their development and made their
profitability uncertain. The testing of power system equipment such as
con...
Four techniques of global error estimation, which are Richardson extrapolation (RS), Zadunaisky's technique (ZD), Solving for the Correction (SC) and Integration of Principal Error Equation (IPEE) have been compared in different integration codes (DOPRI5, DVODE, DSTEP). Theoretical aspects concerning their implementations and their orders are first...
Power systems rely more and more on a wide range of equipment that regulate power plants, voltage and reactive power, or protect the grid against malfunctions.
Many numerical methods used in power system simulation require the
computation of Jacobian matrices. This being particularly true for
implicit integration algorithms, and not for explicit ones. These
computations often take a significant proportion of the overall CPU
time. This paper presents an application of the automatic
differentiation method w...
Résumé -Face aux inévitables tensions sur les ressources pétrolières et fossiles, avec une raréfaction progressives des ressources fossiles et des contraintes sur les émissions de CO 2 qui ne peuvent que se renforcer, les grands industriels ainsi que les PME-PMI doivent poursuivre les efforts en matière d'efficacité énergétique. Le potentiel d'effi...
Citations
... This suggests that x is a function of x; and we will sometimes write (x) or simply in place of x : We will refer to x as the Taylor-Lagrange function, or simply Lagrange function, for this particular situation. In (2) and (3), we have used the notation ...
... -la productivité industrielle : Les investissements dans l'efficacité énergétique peuvent avoir un intérêt stratégique pour les entreprises, les rendant plus compétitives, réduisant leurs coûts d'exploitation et d'entretien et améliorant leurs conditions de travail (Levacher, Clodic, Marechal, 2009). Lorsque les multiples avantages de l'efficacité énergétique sont pris en compte, la période de retour sur investissement est généralement réduite de moitié (Ballot-Miguet & al., 2019). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/279401741733889-1443625974162_Q64/Denis-Clodic.jpg)
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... In some particular situations, usually equipment testing, it may be mandatory to have the simulation executed in real time so that the interaction with real equipments can be studied. Recent developments on processors and on parallel computing technology have made possible the development of high-performance digital real-time power systems simulators (DRTPSS) [3] [5] [7] [9] [12]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/707394824839172-1545667477561_Q64/Bruno-Meyer.jpg)
... To allow for the growing size of analyzed systems, while maintaining a high resolution in the time domain required by switching devices, many simulations employ techniques of parallel computing [4][5][6][7][8][9], such as parallelization of calculations of different components [10,11]. Modern power electronics devices are increasingly penetrating power systems, while requiring even smaller time-steps and, thus, slowing down simulations [12]. ...
... of the system function f repeatedly during the integration process. While many approaches to evaluate the Jacobian matrix-like analytical derivation, finite differences [204,239], and automatic differentiation [240,241]-exist, one has to be aware, that each method has its downsides. To avoid obstacles like an increased maintenance burden or numerical instability [239] one would need to carefully choose an algorithm, which might not be possible at all in general. ...
