seïma SHILI - Academia.edu (original) (raw)
Papers by seïma SHILI
Dans les applications de puissance, les systèmes de stockage d'énergie électrique tels que le... more Dans les applications de puissance, les systèmes de stockage d'énergie électrique tels que les supercondensateurs sont fortement sollicités. Compte tenu des limitations existantes lors de l'utilisation d'un seul composant, un système de stockage d'énergie électrique (module) est constitué d'une association d'éléments (cellules) permettant de s'adapter aux besoins de l'application visée. Afin d'assurer la sécurité de l'équipement et de son utilisateur, un système de gestion d'énergie, qui a pour rôle de surveiller et de contrôler continuellement les cellules, est associé au module de stockage. Le but des travaux de thèse est l'amélioration de la durée de vie des systèmes de stockage d'énergie. Cet objectif est réalisé grâce au contrôle des circuits d'équilibrage, éléments du système de gestion d'énergie, et déjà présents sur ces modules de stockage. Différentes méthodes de contrôle sont donc présentées, analysées et comparée...
2017 IEEE International Conference on Industrial Technology (ICIT), 2017
Dans les applications de puissance, les systemes de stockage d'energie electrique tels que le... more Dans les applications de puissance, les systemes de stockage d'energie electrique tels que les supercondensateurs sont fortement sollicites. Compte tenu des limitations existantes lors de l'utilisation d'un seul composant, un systeme de stockage d'energie electrique (module) est constitue d'une association d'elements (cellules) permettant de s'adapter aux besoins de l'application visee. Afin d'assurer la securite de l'equipement et de son utilisateur, un systeme de gestion d'energie, qui a pour role de surveiller et de controler continuellement les cellules, est associe au module de stockage. Le but des travaux de these est l'amelioration de la duree de vie des systemes de stockage d'energie. Cet objectif est realise grâce au controle des circuits d'equilibrage, elements du systeme de gestion d'energie, et deja presents sur ces modules de stockage. Differentes methodes de controle sont donc presentees, analysees et comparee...
2017 IEEE Vehicle Power and Propulsion Conference (VPPC), 2017
Cell temperature is a key parameter in terms of ageing and discharge capacity. The objective of t... more Cell temperature is a key parameter in terms of ageing and discharge capacity. The objective of this paper is to present a reproducible method to characterize the thermal and the electrical parameters of a large cell used in an electric vehicle. A real electric vehicle lithium iron phosphate (LFP) cell is characterized thermally and electrically at 25 °C. The model temperature and voltage are then compared with the real cell using a high power WLTC (Worldwide harmonized Light duty driving Test Cycle) current cycle at 25°C ambient temperature.
IEEE Transactions on Power Electronics, 2017
Energy storage elements such as supercapacitors are widely used in high power applications. Howev... more Energy storage elements such as supercapacitors are widely used in high power applications. However, due to single cell voltage limitation, an energy storage system with large number of supercapacitors is often employed. Energy management systems are associated to energy storage systems in order to assure user and equipment safety. Balancing circuits, which enable the equalization of the voltage of each element in series, are a part of energy management system device. The work presented in this paper aims to enhance the lifetime of energy storage systems. It relies on better controlling balancing circuits on the terminals of the storage system elements. With the conventional function of balancing circuit, the energy storage system is limited by its weakest element which may fail prematurely. Thus, a new balancing approach is presented, discussed and analyzed. It is based on the elements degradation level prediction. The model predictive control used with the new approach, aims to equalize aging speed between elements of a module and ensures a maximum lifetime to the energy storage system. A comparison with the conventional control, shows that adopting this new approach, with the same equipment, can enhance the storage system's lifetime by dozens percent.
Journal of Energy Storage, 2016
In this paper, a novel online technique for the state of health monitoring of supercapacitors ene... more In this paper, a novel online technique for the state of health monitoring of supercapacitors energy storage systems is presented. It is based on measuring the equivalent series resistance of the energy storage element representing its aging. The suggested approach uses a suitable balancing circuit connected to the terminal of the storage element in order to extract its actual parameters. This new method is characterized by its simplicity which makes it convenient for industrial applications. A test bench is developed in order to prove the new method's reliability and accuracy. Experimental results taken from the test bench and from an offline classical laboratory characterization method shows that the differences between both responses do not exceed 7%.
2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2015
In this paper, an original technique for monitoring the aging of supercapacitor energy storage sy... more In this paper, an original technique for monitoring the aging of supercapacitor energy storage system is proposed. The aging of supercapacitor is represented by the degradation of its internal parameters as the loss of capacitance and the increase of the Equivalent Series Resistance (ESR). This degradation is continuous until reaching the end of life criteria. The proposed approach is based on estimating the current ESR, of each storage system element with a fast control of the balancing circuit present at the terminal of each storage element. The fast control is applied for a short moment and could be applied at any storage system state with no incidence on the system. The information about this current parameter makes the state of health monitoring possible. The analysis is performed using simulation with realistic storage system models in order to demonstrate and validate the effectiveness and the accuracy of the proposed technique. The results presented covers storage system such as supercapacitor but could be also applied to batteries.
Dans les applications de puissance, les systèmes de stockage d'énergie électrique tels que le... more Dans les applications de puissance, les systèmes de stockage d'énergie électrique tels que les supercondensateurs sont fortement sollicités. Compte tenu des limitations existantes lors de l'utilisation d'un seul composant, un système de stockage d'énergie électrique (module) est constitué d'une association d'éléments (cellules) permettant de s'adapter aux besoins de l'application visée. Afin d'assurer la sécurité de l'équipement et de son utilisateur, un système de gestion d'énergie, qui a pour rôle de surveiller et de contrôler continuellement les cellules, est associé au module de stockage. Le but des travaux de thèse est l'amélioration de la durée de vie des systèmes de stockage d'énergie. Cet objectif est réalisé grâce au contrôle des circuits d'équilibrage, éléments du système de gestion d'énergie, et déjà présents sur ces modules de stockage. Différentes méthodes de contrôle sont donc présentées, analysées et comparée...
2017 IEEE International Conference on Industrial Technology (ICIT), 2017
Dans les applications de puissance, les systemes de stockage d'energie electrique tels que le... more Dans les applications de puissance, les systemes de stockage d'energie electrique tels que les supercondensateurs sont fortement sollicites. Compte tenu des limitations existantes lors de l'utilisation d'un seul composant, un systeme de stockage d'energie electrique (module) est constitue d'une association d'elements (cellules) permettant de s'adapter aux besoins de l'application visee. Afin d'assurer la securite de l'equipement et de son utilisateur, un systeme de gestion d'energie, qui a pour role de surveiller et de controler continuellement les cellules, est associe au module de stockage. Le but des travaux de these est l'amelioration de la duree de vie des systemes de stockage d'energie. Cet objectif est realise grâce au controle des circuits d'equilibrage, elements du systeme de gestion d'energie, et deja presents sur ces modules de stockage. Differentes methodes de controle sont donc presentees, analysees et comparee...
2017 IEEE Vehicle Power and Propulsion Conference (VPPC), 2017
Cell temperature is a key parameter in terms of ageing and discharge capacity. The objective of t... more Cell temperature is a key parameter in terms of ageing and discharge capacity. The objective of this paper is to present a reproducible method to characterize the thermal and the electrical parameters of a large cell used in an electric vehicle. A real electric vehicle lithium iron phosphate (LFP) cell is characterized thermally and electrically at 25 °C. The model temperature and voltage are then compared with the real cell using a high power WLTC (Worldwide harmonized Light duty driving Test Cycle) current cycle at 25°C ambient temperature.
IEEE Transactions on Power Electronics, 2017
Energy storage elements such as supercapacitors are widely used in high power applications. Howev... more Energy storage elements such as supercapacitors are widely used in high power applications. However, due to single cell voltage limitation, an energy storage system with large number of supercapacitors is often employed. Energy management systems are associated to energy storage systems in order to assure user and equipment safety. Balancing circuits, which enable the equalization of the voltage of each element in series, are a part of energy management system device. The work presented in this paper aims to enhance the lifetime of energy storage systems. It relies on better controlling balancing circuits on the terminals of the storage system elements. With the conventional function of balancing circuit, the energy storage system is limited by its weakest element which may fail prematurely. Thus, a new balancing approach is presented, discussed and analyzed. It is based on the elements degradation level prediction. The model predictive control used with the new approach, aims to equalize aging speed between elements of a module and ensures a maximum lifetime to the energy storage system. A comparison with the conventional control, shows that adopting this new approach, with the same equipment, can enhance the storage system's lifetime by dozens percent.
Journal of Energy Storage, 2016
In this paper, a novel online technique for the state of health monitoring of supercapacitors ene... more In this paper, a novel online technique for the state of health monitoring of supercapacitors energy storage systems is presented. It is based on measuring the equivalent series resistance of the energy storage element representing its aging. The suggested approach uses a suitable balancing circuit connected to the terminal of the storage element in order to extract its actual parameters. This new method is characterized by its simplicity which makes it convenient for industrial applications. A test bench is developed in order to prove the new method's reliability and accuracy. Experimental results taken from the test bench and from an offline classical laboratory characterization method shows that the differences between both responses do not exceed 7%.
2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2015
In this paper, an original technique for monitoring the aging of supercapacitor energy storage sy... more In this paper, an original technique for monitoring the aging of supercapacitor energy storage system is proposed. The aging of supercapacitor is represented by the degradation of its internal parameters as the loss of capacitance and the increase of the Equivalent Series Resistance (ESR). This degradation is continuous until reaching the end of life criteria. The proposed approach is based on estimating the current ESR, of each storage system element with a fast control of the balancing circuit present at the terminal of each storage element. The fast control is applied for a short moment and could be applied at any storage system state with no incidence on the system. The information about this current parameter makes the state of health monitoring possible. The analysis is performed using simulation with realistic storage system models in order to demonstrate and validate the effectiveness and the accuracy of the proposed technique. The results presented covers storage system such as supercapacitor but could be also applied to batteries.