2 research outputs found
L’Ecriture du tragique dans De glace et de feu de Suzanne El Kenz
Get PDFL’Ecriture du tragique dans De glace et de
feu de Suzanne El KenzDans le roman, le tragique prend une place singulière en explorant les facettes sombres
de l'existence humaine, les dilemmes moraux, et les fatalités inévitables. Cetterecherche
examine la place du tragique dans notre corpus, ses expressions et ses desseins sur le lecteur.
Le tragique, dérivé du théâtre grec ancien, est une représentation de situations humaines
caractérisées par la souffrance, la fatalité, et la lutte contre des forces insurmontables. Dans le
contexte du roman, il se traduit par des récits où les personnages sont confrontés à des
situations sans issue, où les choix moraux et les contraintes sociales mènent souvent à des fins
inéluctables et douloureuses
Optimal Control of Hybrid Photovoltaic/Thermal Water System in Solar Panels Using the Linear Parameter Varying Approach
Get PDFDuring photovoltaic (PV) conversion in solar panels, a part of the solar radiation is not converted to electricity by the cells, producing heat that could increase their temperature. This increase in temperature deteriorates the performance of the PV panel. In this paper, a hybrid PV/thermal (PV/T) water system is proposed to mitigate this problem. This system combines a PV panel and a thermal collector. In this paper, we focused on the modeling and control of this hybrid system in the linear parameter varying (LPV) framework. An optimal linear quadratic regulator (LQR) is proposed to control the PV cell temperature around an optimal value that maximises electricity generation. Since the system model is nonlinear, an optimal LQR gain-scheduling state-feedback control approach based on an LPV representation of the nonlinear model is designed using the Linear Matrix Inequality (LMI) method. The goal is to obtain the maximum electrical power for each solar panel. Since a reduced number of sensors is available, an LPV Kalman filter is also proposed to estimate the system states required by the state-feedback controller. The obtained results in a laboratory setup in simulation are used to assess the proposed approach, showing promise in terms of control performance of the PV/T system.This work has been co-financed by the Spanish State Research Agency (AEI) and the European Regional Development Fund (ERFD) through the project SaCoAV (ref. MINECO PID2020-114244RB-I00), by the European Regional Development Fund of the European Union in the framework of the ERDF Operational Program of Catalonia 2014–2020 (ref. 001-P-001643 Looming Factory), and by the DGR of Generalitat de Catalunya (SAC group ref. 2017/SGR/482). The author is also supported by an Industrial PhD AGAUR grant (Ref. 2019 DI 040).Peer reviewe
