Commande « sans modèle » pour l'asservissement numérique d'un banc de caractérisation magnétique

International audience Dans cet article, nous présentons une stratégie innovante d'asservissement numérique destinée à piloter un banc de caractérisation de matériaux magnétiques doux de type cadre Epstein. L'objectif est d'imposer la forme de l'induction magnétique quelle que soit l'excitation et le matériau. Compte- tenu du caractère non-linéaire des courbes d'aimantation des matériaux magnétiques, une commande originale de type « sans modèle » est considérée. Les propriétés dynamiques en boucle fermée permettent d'assurer une certaine robustesse vis-à-vis des modifications du point de fonctionnement associées essentiellement à la forme de l'hystérésis magnétique. Le fonctionnement et les performances de l'asservissement sont illustrés à la fois par des simulations basées sur le modèle d'hystérésis magnétique de Jiles-Atherton et expérimentalement.  </div

Digital Electronic Conditioning Approach for the High Sensitivity Off-diagonal GMI Sensors

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Digital Electronic Conditioning Approach for the High Sensitivity Off-diagonal GMI Sensors

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Introduction of real-time digital processing techniques for the high-sensitivity GMI sensors

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LADRC applied to variable speed micro-hydro plants: Experimental validation

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Generalized Integrator-Extended State Observer With Applications to Grid-Connected Converters in the Presence of Disturbances

International audienceLarge-scale fast-varying sinusoidal disturbances (FVSDs) strongly impact the operation of Grid-connected Converters (GcCs). A conventional extended state observer (ESO) is not sufficiently capable to deal with these rapid disturbances. This critical weakness has limited ESO's applications to GcCs. Therefore, a generalized integrator-ESO (GI-ESO) is developed from ESO to address such issues. Knowing that grid common disturbances can be expressed as a phase, frequency, or magnitude disturbed sinusoidal signal, multi-GIs of selective resonant frequencies are, hence, applied into the disturbance estimation loop, which enables FVSD to be observed with relatively low bandwidth. Besides, a frequency-adaptive mechanism is introduced in order to mitigate the effects of frequency deviations. The proposed GI-ESO resolves the tradeoff between the observer's bandwidth and noise filtering. A case of the three-phase phase-locked loop control system of disturbed regimes is, in particular, studied to assess the performance of GI-ESO and the stability of the resulting controlled system. Theoretical analysis and experimental results have proven its effectiveness in applications to GcCs in the presence of various disturbances

Comparative study of solar panel decentralized controls in low voltage network with real time simulation

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Power hardware-in-the-loop validation of primary frequency robust control in stand-alone microgrids with storage units

International audienceThis paper describes a multi-variable robust control scheme for frequency regulation in a diesel–photovoltaic–supercapacitor hybrid power generation system operating in stand-alone mode. The proposed control structure relies on a two-level architecture, with conventional PI-based current tracking controllers placed on the lower control level and receiving references from an Hinfinity-control-based upper level. The specific engineering demands of microgrid operation are cast into an Hinfinity control formalism. A rapid-prototyping test bench composed of a real supercapacitor-based energy storage system and an emulated diesel–photovoltaic–load grid is developed using real-time digital simulators, namely RT-LAB® and dSPACE®, in order toexperimentally validate the proposed frequency robust control strategy under realistic operating conditions

Reduced-scale models of variable speed hydro-electric plants for power hardware-in-the-loop real-time simulations

International audienceVariable Speed Hydro-Electric Plant (VS-HEP) equipped with power electronics has been increasingly introduced into the hydraulic context. This paper is targeting a VS-HEP Power Hardware-In-the-Loop (PHIL) real-time simulation system, which is dedicated to different hydraulic operation schemes tests and control laws validation. Then, a proper hydraulic model will be the key factor for building an efficient PHIL real-time simulation system. This work introduces a practical and generalised modelling hydraulic modelling approach, which is based on ‘Hill Charts’ measurements provided by industrial manufacturers. The hydraulic static model is analytically obtained by using mathematical optimization routines. In addition, the nonlinear dynamic model of the guide vane actuator is introduced in order to evaluate the effects of the induced dynamics on the electric control performances. Moreover, the reduced-scale models adapted to different laboratory conditions can be established by applying scaling laws. The suggested modelling approach enables the features of decent accuracy, light computational complexity, high flexibility and wide applications for their implementations on PHIL real-time simulations. Finally, a grid-connected energy conversion chain of bulb hydraulic turbine associated with a permanent magnet synchronous generator is chosen as an example for PHIL design and performance assessment