EPE Association: EPE 2011 - LS6a: Topic 18: Energy Management in Road Vehicles

EPE 2011 - LS6a: Topic 18: Energy Management in Road Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 18: Electrical systems in Road Vehicles > EPE 2011 - LS6a: Topic 18: Energy Management in Road Vehicles

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   Accurate sizing of supercapacitor storage system considering its capacitance variation
By Sony TRIESTE, Salvy BOURGUET, Jean-Christophe OLIVIER, Luc LORON, Jean-Claude LE CLAIRE [View]
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Abstract: This paper highlights the energy errors made for the design of supercapacitors used as a main energy source. First of all, the paper presents the two definitions of capacitance of a capacitance-voltage dependent material. The number of supercapacitors is important for the application purchasing cost. That is why the paper introduces an analytical model and an electrical model along with an identification method for the capacitance variation. This variation is presented and compared to the manufacturer value in order to underscore the energy error between the manufacturer, the constant approximation and the first order approximation which interests us here. This paper also presents the sizing aspect considering the losses associated to a constant-current charging mode in order to minimize the electrical losses. At last, an application case compares the number of supercapacitors for different approximations of the capacitance.

   Multiport Converter for Fast Charging of Electrical Vehicle Battery
By Gierri WALTRICH, Jorge L. DUARTE, Marcel A.M. HENDRIX [View]
[Download]

Abstract: The availability of new electrical vehicle batteries with high current rating and capacity permits the realization of rapid charging. However, when using conventional methods, the charging process requires an expensive high-current grid interface. Therefore, a multiport converter with a stationary storage port to reduce the current required from the grid is proposed. The goal of this paper is to explore the fundamentals of the converters used in each port. Simulation results for a 40-kW multiport converter validate the study presented.

   Performances regeneration of supercapacitors during accelerated ageing tests in power cycling
By Ramzi CHAARI, Akram EDDAHECH, Olivier BRIAT, Nicolas BERTRAND, Jean-Yves DELETAGE, Jean-Michel VINASSA [View]
[Download]

Abstract: In this paper, a testing methodology for ageing quantification of supercapacitors (SC) for HybridElectric Vehicles (HEV) applications is investigated. The performances regeneration ofsupercapacitors after power cycling tests is studied. Parameters of double layer capacitor (EDCL) maybe recovered after it is has faded. This phenomenon is characterized by an increase of the capacitance,a decrease of the series resistance and can be explained by the charges redistribution inside the porouscarbon electrodes when the power cycling is stopped. So, capacitance recovery may be increasing theenergy storage and the useful life of supercapacitors. Many factors have an influence in thesephenomena like the age of ultracapacitors, also the stop duration and may be the voltage andtemperature during stop.

EPE 2011 - LS6a: Topic 18: Energy Management in Road Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 18: Electrical systems in Road Vehicles > EPE 2011 - LS6a: Topic 18: Energy Management in Road Vehicles
	[return to parent folder]

	Accurate sizing of supercapacitor storage system considering its capacitance variation By Sony TRIESTE, Salvy BOURGUET, Jean-Christophe OLIVIER, Luc LORON, Jean-Claude LE CLAIRE	[View] [Download]
Abstract: This paper highlights the energy errors made for the design of supercapacitors used as a main energy source. First of all, the paper presents the two definitions of capacitance of a capacitance-voltage dependent material. The number of supercapacitors is important for the application purchasing cost. That is why the paper introduces an analytical model and an electrical model along with an identification method for the capacitance variation. This variation is presented and compared to the manufacturer value in order to underscore the energy error between the manufacturer, the constant approximation and the first order approximation which interests us here. This paper also presents the sizing aspect considering the losses associated to a constant-current charging mode in order to minimize the electrical losses. At last, an application case compares the number of supercapacitors for different approximations of the capacitance.

	Multiport Converter for Fast Charging of Electrical Vehicle Battery By Gierri WALTRICH, Jorge L. DUARTE, Marcel A.M. HENDRIX	[View] [Download]
Abstract: The availability of new electrical vehicle batteries with high current rating and capacity permits the realization of rapid charging. However, when using conventional methods, the charging process requires an expensive high-current grid interface. Therefore, a multiport converter with a stationary storage port to reduce the current required from the grid is proposed. The goal of this paper is to explore the fundamentals of the converters used in each port. Simulation results for a 40-kW multiport converter validate the study presented.

	Performances regeneration of supercapacitors during accelerated ageing tests in power cycling By Ramzi CHAARI, Akram EDDAHECH, Olivier BRIAT, Nicolas BERTRAND, Jean-Yves DELETAGE, Jean-Michel VINASSA	[View] [Download]
Abstract: In this paper, a testing methodology for ageing quantification of supercapacitors (SC) for HybridElectric Vehicles (HEV) applications is investigated. The performances regeneration ofsupercapacitors after power cycling tests is studied. Parameters of double layer capacitor (EDCL) maybe recovered after it is has faded. This phenomenon is characterized by an increase of the capacitance,a decrease of the series resistance and can be explained by the charges redistribution inside the porouscarbon electrodes when the power cycling is stopped. So, capacitance recovery may be increasing theenergy storage and the useful life of supercapacitors. Many factors have an influence in thesephenomena like the age of ultracapacitors, also the stop duration and may be the voltage andtemperature during stop.