Papers by Christophe Pasquier
HAL (Le Centre pour la Communication Scientifique Directe), Apr 13, 2021
En hautes fréquences, le secteur des communications (liaison numérique asymétrique-ADSL) et le se... more En hautes fréquences, le secteur des communications (liaison numérique asymétrique-ADSL) et le secteur des réseaux électriques intelligents (courants porteurs en ligne-CPL) sont des terreaux de génération de rayonnement électromagnétique non intentionnel dans l'environnement proche et lointain. Ce rayonnement essentiellement généré par le flux d'un courant en hautes fréquences circulant sur des réseaux filaires est considéré comme une source de pollution EM qui nécessite d'être évaluée, ce qui revêt une importance capitale de point de vue compatibilité électromagnétique (CEM). En effet, il s'avère incontournable de connaître la cartographie des champs EM rayonnés par une telle structure afin d'évaluer le degré de nuisance électromagnétique émise par un quelconque appareillage sur les équipements voisins. La mesure expérimentale classique permettant d'identifier cette cartographie est toujours intrusive et introduit une déformation complémentaire du champ EM mesuré, surtout en zone très proche de la source émettrice. Afin de contourner cette problématique, le présent travail s'intéresse à l'évaluation spatiale des champs EM rayonnés par un réseau filaire sans besoin de sondes de champ électrique et de champ magnétique. Nous proposons un système de mesure à base d'électronique embarquée qui permettrait d'accéder au rayonnement EM à partir de quelques mesures du courant en des points stratégiques de l'installation. Il nous semble évident que ce lien direct entre courant en quelques points et champ rayonné interroge quand à la sécurité d'un réseau d'énergie ou de communication et laisse à penser que le problème inverse peut trouver solution et par conséquent faciliter l'accès aux données, ce problème inverse sera traité dans d'autres articles.
EDP Sciences eBooks, Jan 5, 2002
This paper proposes new modulation strategy in order to balance neutral-point voltage in the thre... more This paper proposes new modulation strategy in order to balance neutral-point voltage in the three-level Voltage Source Inverter (VSI). In the proposed method, not only initial neutral-point voltages and wanted voltage vector but also resulted current is used to detect and apply appropriate space vectors. In this method, all space vectors can be categorized into two dynamic groups which are P-Type and N-Type vectors. For each dynamic category, containing vectors are selected based on resulted current vector. This method slightly injects high order harmonics which lead to enhance voltage THD, due to using small and medium space vectors. Respecting dynamic categorizing, the proposed method has strong capability to rapidly balance neutral-point voltage, with regardless ripple for all modulation index ranges and balanced/unbalanced loads. Simulation results verify the validity and capability of the modulation strategy, also the proposed method is easy to implement without adding any extra hardware and expenses.
IEEE Transactions on Industrial Electronics, Mar 1, 2017
In this paper, the near-state pulse width modulation (NSPWM), adapted to be used in dual-voltage ... more In this paper, the near-state pulse width modulation (NSPWM), adapted to be used in dual-voltage source inverter (VSI) fed open-end load, is introduced primarily aiming to appreciably minimize the voltage total harmonic distortion (THD). Within the framework of the proposed method, the active time of pulses at the second inverter is relatively adjusted within switching interval (compared to the first VSI). The phase voltage harmonics are formulated for dual-inverter modulated by NSPWM; then, optimal adjustment is identified via a three-dimensional curve of phase voltage THD versus modulation index (MI) and phase angle displacement (PAD). Due to the limitation of MI in NSPWM, the desired output voltage is synthesized with modifying not only MI but also PAD between references of two VSIs. Furthermore, NSPWM inherently takes advantage of better efficiency compared to conventional space vector modulation due to switching only two phases within an interval (by clamping one phase to positive/negative dc-rail). The dual-VSI supplied by two isolated dc sources is assembled in the laboratory to experimentally evaluate the THD reduction feature of the proposed method; also, the simulation results obtained by means of a MATLAB/Simulink environment show close agreement with experimental data.
HAL (Le Centre pour la Communication Scientifique Directe), Dec 18, 2020
HAL (Le Centre pour la Communication Scientifique Directe), Sep 7, 2014
International audienc
International Conference on Software, Telecommunications and Computer Networks, Nov 12, 2012
Abstract In this paper the authors compare two approximate models for frequency domain analysis o... more Abstract In this paper the authors compare two approximate models for frequency domain analysis of TM plane wave coupling to horizontal thin-wire conductor above homogenous lossy soil. The first approach is based on quasi-static image theory and the second one is based on transmission line theory. The main objective is to determine the accuracy of the approximate models by analyzing the current distribution with respect to rigorous electromagnetic approach. Detailed parametric analysis indicates the applicability domain ...
HAL (Le Centre pour la Communication Scientifique Directe), Sep 1, 2018
The paper deals with a novel technique to identify the artifact shape and reduce residual threat ... more The paper deals with a novel technique to identify the artifact shape and reduce residual threat during its removal. The method is based on the stimulus artifact reconstruction by using the high resolution Matrix Pencil method. The proposed technique has proved to be efficient in eliminating the stimulus artifact from signals which were recorded on a rat’s sciatic nerve.
HAL (Le Centre pour la Communication Scientifique Directe), Sep 7, 2014
International audienc
IEEE EUROCON 2017 -17th International Conference on Smart Technologies, 2017
This paper presents a high resolution method for analyzing of electrophysiological activities usi... more This paper presents a high resolution method for analyzing of electrophysiological activities using Matrix Pencil Method (MPM). This approach identifies measured signal from nerves to better understanding the functional organization of neuronal ensembles that form the peripheral nerves or the cerebral cortex. Matrix Pencil Method which is used to extract original signals and benefits from minimum exponential functions while having excellent reproducibility feature. MPM also can eliminate the noise part of the system and return pure original signal. In this paper, MPM is used to reconstruct recorded action potential from cockroach by using Matlab environment which shows less than 4% error.
2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2017
Undesired EM radiation generated by wired systems using a PLC transmission, for example, can be a... more Undesired EM radiation generated by wired systems using a PLC transmission, for example, can be a source of EM pollution and bring an annoying problem of electromagnetic compatibility. The evaluation of these near-field radiation is therefore of interest. In this paper, we propose a simplified approach of electromagnetic fields in order to adequately estimate the EM radiation emitted by the wired systems with a simple measurement of currents and its first two derivatives at discontinuities (geometric and electric). This model is capable of handling cases where the identification of the current along the lines network is complicated and numerically consuming (FEKO, NEC, etc.). The validation consists of processing the case of a two-wire line of finite conductivity, and we have studied the influence of the distance between the conductive wires of this line on the electromagnetic radiation impact.
2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med), 2018
Stimulus artifact affecting electrophysiological recordings makes neural response analysis quite ... more Stimulus artifact affecting electrophysiological recordings makes neural response analysis quite difficult. To analyze response with a maximum of precision, one needs to remove firstly the stimulus artifact without causing a neural response distortion. This paper introduces a new method of stimulus artifact removal based on its reconstruction with Matrix Pencil method.
2018 26th International Conference on Software, Telecommunications and Computer Networks (SoftCOM), 2018
The paper deals with a novel technique to identify the artifact shape and reduce residual threat ... more The paper deals with a novel technique to identify the artifact shape and reduce residual threat during its removal. The method is based on the stimulus artifact reconstruction by using the high resolution Matrix Pencil method. The proposed technique has proved to be efficient in eliminating the stimulus artifact from signals which were recorded on a rat’s sciatic nerve.
IEEE Transactions on Power Electronics, 2016
In this paper, the Near-State PWM (NSPWM), adapted to be implemented in dual-VSI fed open-end mot... more In this paper, the Near-State PWM (NSPWM), adapted to be implemented in dual-VSI fed open-end motor, is proposed with the aim of mitigating low-order harmonics (which lead to current THD minimization). Two proposed methods are studied in detail such as: (a) fixing Phase Angle Displacement (PAD) between two Voltage Source Inverters (VSIs) to 120° while adjusting Modulation Index (MI); and (b) fixing MI to the predetermined value (wherein low-order harmonics are highly mitigated) while adjusting PAD. Furthermore, the proposed approaches enhance efficiency by limiting the number of commutations within switching interval. The paper also presents the mathematical approaches to accurately determine low-order harmonic components and switching losses for dual-VSI structure. The experimental setup, including dual-VSI and openend induction motor, is assembled in the laboratory to evaluate performance of the proposed method. Finally, the simulation results, carried out in the MATLAB/Simulink environment, are found to be in a close agreement with experimental data.
In this paper the authors compare two approximate models for frequency domain analysis of TM plan... more In this paper the authors compare two approximate models for frequency domain analysis of TM plane wave coupling to horizontal thin-wire conductor above homogenous lossy soil. The first approach is based on quasi-static image theory and the second one is based on transmission line theory. The main objective is to determine the accuracy of the approximate models by analyzing the current distribution with respect to rigorous electromagnetic approach. Detailed parametric analysis indicates the applicability domain ...
HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2020
HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2020
2009 International Conference on Advances in Computational Tools for Engineering Applications, 2009
Abstract This paper presents an analytical model to quantify the radiated field by an insulated a... more Abstract This paper presents an analytical model to quantify the radiated field by an insulated antenna. This antenna corresponds to a PLC transmission line with dielectric coat, the current distribution is assumed to be sinusoidal. The basic electromagnetic equations are formulated and applied to this insulated antenna in free space. The most advanced analytical model, corresponding to the far field radiation of linear antenna, has been proposed by RWP King. In this case, the propagation constants (beta 0) in free space and ...
Abstract In this article, we present our investigations on the radiation of the power-line commun... more Abstract In this article, we present our investigations on the radiation of the power-line communication (PLC) system. Power line communication or power line carrier is a technology for carrying data on a conductor usually dedicated to electric power transmission. At high frequency, the power lines, whose are dimensioned and adjusted for electrical energy transfer, not to carry high frequency (HF) data signal, act then as radiating antennas.
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Papers by Christophe Pasquier