EPE Association: EPE 2015 - LS2d: Energy Storage Systems

EPE 2015 - LS2d: Energy Storage Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 05: Renewable Energy Power Systems > EPE 2015 - LS2d: Energy Storage Systems

   [return to parent folder]

   Design Aspects of an Experimental Setup for Investigating Current Ripple Effects in Lithium-ion Battery Cells
By RUDI SOARES [View]
[Download]

Abstract: This paper describes an experimental setup for investigating the effects of current ripple on lithium-ionbattery cells. The experimental setup is designed so that twelve li-ion cells can be simultaneously testedin a controlled environment. The experimental setup allows for a wide range of current ripple in terms offrequency and amplitude. Additionally, the quantification of the current ripple effects such as the agingof li-ion cells implies that a precise measurement system has to be designed which also are discussed inthe paper.

   High efficiency electrolyser power supply for household hydrogen production and storage systems
By Lajos TOROK [View]
[Download]

Abstract: The paper presents a three-phase prototype power supply operated electrolyser system for household hydrogen production and storage systems. The purpose of the work was to increase the overall efficiency of an electrolyser system by improving the performance of the power supply. The new prototype was designed for high efficiency by using SIC MOSFETs and PSFB-CD with slim-DC topology. The advantages of using small DC-link capacitor is the small inrush current and longer lifetime (film capacitors can be applies). As a side effect a 300 Hz ripple is introduced in the output current which according to the measurements and the literature about the previous work does not affect the H2 production. The resulting efficiency of the power supply is 94.3 \% at nominal power and does not drop under 90 \% even at light loads (>1 kW).

   Modular Equalization Architecture Using Inter-Module and Switchless Intra-Module Equalizer for Energy Storage System
By Masatoshi UNO [View]
[Download]

Abstract: This paper proposes a novel modular equalization architecture using inter-module and intra-module equalizers for energy storage systems comprising multiple cells/modules connected in series. In the proposed equalization architecture, cells in a module is equalized by a series-resonant voltage multiplier (SRVM)-based intra-module equalizer while module voltages are unified by a switched capacitor converter (SCC)-based inter-module equalizer. A square wave voltage generated at a switching node of the SCC-based inter-module equalizer is utilized to drive the SRVM-based intra-module equalizer so that the SRVM-based intra-module equalizer can be totally switchless topology. The required switch count of the proposed equalization architecture can be dramatically reduced compared to conventional architectures, allowing simplified circuitry. The proposed equalization architecture is modular and allows different equalizer topologies to be used for inter- and intra-module equalizers, offering good modularity and design flexibility. The derivation procedure of the proposed equalization architecture is explained, followed by separate analyses for the SCC-based inter-module equalizer and SRVM-based intra-module equalizer. An experimental equalization test for three supercapacitor (SC) modules, each consisting of four cells in series, was performed from an initially voltage-imbalanced condition. Module and cell voltages were equalized at different rates, and the equalization performance of the proposed modular equalization architecture was successfully demonstrated.

   The application of double-layer capacitor modules for energy storage devices in production machinery
By Artem KOLESNIKOV [View]
[Download]

Abstract: The development approach for an energy storage system focuses on optimal sized double-layer capacitor modules to reduce peak power and to avoid malfunctions of production machinery caused by voltage interruptions. The required kind of charging for the energy storage system and adjustment of voltage control parameters was executed for line-side converters of drive groups in production machinery. The energy efficiency of electric drives with and without such an energy storage system was investigated by means of active power measurements and simulations of electric power flows in Matlab/SimPowerSystems.

EPE 2015 - LS2d: Energy Storage Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 05: Renewable Energy Power Systems > EPE 2015 - LS2d: Energy Storage Systems
	[return to parent folder]

	Design Aspects of an Experimental Setup for Investigating Current Ripple Effects in Lithium-ion Battery Cells By RUDI SOARES	[View] [Download]
Abstract: This paper describes an experimental setup for investigating the effects of current ripple on lithium-ionbattery cells. The experimental setup is designed so that twelve li-ion cells can be simultaneously testedin a controlled environment. The experimental setup allows for a wide range of current ripple in terms offrequency and amplitude. Additionally, the quantification of the current ripple effects such as the agingof li-ion cells implies that a precise measurement system has to be designed which also are discussed inthe paper.

	High efficiency electrolyser power supply for household hydrogen production and storage systems By Lajos TOROK	[View] [Download]
Abstract: The paper presents a three-phase prototype power supply operated electrolyser system for household hydrogen production and storage systems. The purpose of the work was to increase the overall efficiency of an electrolyser system by improving the performance of the power supply. The new prototype was designed for high efficiency by using SIC MOSFETs and PSFB-CD with slim-DC topology. The advantages of using small DC-link capacitor is the small inrush current and longer lifetime (film capacitors can be applies). As a side effect a 300 Hz ripple is introduced in the output current which according to the measurements and the literature about the previous work does not affect the H2 production. The resulting efficiency of the power supply is 94.3 \% at nominal power and does not drop under 90 \% even at light loads (>1 kW).

	Modular Equalization Architecture Using Inter-Module and Switchless Intra-Module Equalizer for Energy Storage System By Masatoshi UNO	[View] [Download]
Abstract: This paper proposes a novel modular equalization architecture using inter-module and intra-module equalizers for energy storage systems comprising multiple cells/modules connected in series. In the proposed equalization architecture, cells in a module is equalized by a series-resonant voltage multiplier (SRVM)-based intra-module equalizer while module voltages are unified by a switched capacitor converter (SCC)-based inter-module equalizer. A square wave voltage generated at a switching node of the SCC-based inter-module equalizer is utilized to drive the SRVM-based intra-module equalizer so that the SRVM-based intra-module equalizer can be totally switchless topology. The required switch count of the proposed equalization architecture can be dramatically reduced compared to conventional architectures, allowing simplified circuitry. The proposed equalization architecture is modular and allows different equalizer topologies to be used for inter- and intra-module equalizers, offering good modularity and design flexibility. The derivation procedure of the proposed equalization architecture is explained, followed by separate analyses for the SCC-based inter-module equalizer and SRVM-based intra-module equalizer. An experimental equalization test for three supercapacitor (SC) modules, each consisting of four cells in series, was performed from an initially voltage-imbalanced condition. Module and cell voltages were equalized at different rates, and the equalization performance of the proposed modular equalization architecture was successfully demonstrated.

	The application of double-layer capacitor modules for energy storage devices in production machinery By Artem KOLESNIKOV	[View] [Download]
Abstract: The development approach for an energy storage system focuses on optimal sized double-layer capacitor modules to reduce peak power and to avoid malfunctions of production machinery caused by voltage interruptions. The required kind of charging for the energy storage system and adjustment of voltage control parameters was executed for line-side converters of drive groups in production machinery. The energy efficiency of electric drives with and without such an energy storage system was investigated by means of active power measurements and simulations of electric power flows in Matlab/SimPowerSystems.