EPE Association: EPE 2013 - LS7b: Converters for Energy Storage and their Control

EPE 2013 - LS7b: Converters for Energy Storage and their Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 15: Non-rotating power generation and storage systems > EPE 2013 - LS7b: Converters for Energy Storage and their Control

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   ANCILLARY SERVICES PROVIDED FROM WIND POWER PLANT AUGMENTED WITH ENERGY STORAGE
By Philip KJAER, Rasmus LAERKE, German TARNOWSKI [View]
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Abstract: This paper presents a scheme to augment a wind power plant with energy storage and apply combined controls for provision of frequency support, inertial response and power oscillation damping. Practical experience from a power plant configured with 12MW wind generation and 1.6MW energy storage is discussed, including sample results from tests of the ancillary services functionality.

   Integration of Batteries into a Modular Multilevel Converter
By Markus SCHROEDER, Johann JAEGER, Stefan HENNINGER, Andreja RASIC, Hubert RUBENBAUER, Holger LEU [View]
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Abstract: In this paper the challenges of integrating batteries into the Modular Multilevel Converter are described. For this purpose, the technology of this converter topology is briefly introduced. An overview on already available products of battery energy storage systems is given. Based on that, a control concept for a DC-to-DC converter connecting a battery to a module of the Modular Multilevel Converter is presented. This concept contains an additional energy balancing algorithm. Several operating points of the whole system with integrated batteries are simulated. The paper is topped off with measurement results of a started-up hardware setup that is equipped with emulated DC-to-DC converters.

   Optimal Design of the Modular Multilevel Converter for an Energy Storage System Based on Split Batteries
By Andre HILLERS, Juergen BIELA [View]
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Abstract: This paper presents the optimal design of a modular multilevel converter (MMC) for use in a stand-alone high power energy storage system based on split batteries (sBESS). The MMC allows for the sBESS to connect directly to the medium-voltage grid without the need for a line-transformer.A free parameter variation is performed to compare designs with different numbers of modules and different power semiconductors.Many commercially available IGBTs were found to be overdimensioned for the 5MW, 20kV target system, and better results were obtained with optimized assemblies.When the converter is designed with just a few more modules than absolutely necessary, the total size of the passive components can be reduced drastically, while the power losses increase only marginally.An attractive candidate system is given a closer look, for which a peak power-conversion efficiency of 99.3 is predicted (not including power losses in the line-filter and in the dc-dc converters to interface the batteries)

EPE 2013 - LS7b: Converters for Energy Storage and their Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 15: Non-rotating power generation and storage systems > EPE 2013 - LS7b: Converters for Energy Storage and their Control
	[return to parent folder]

	ANCILLARY SERVICES PROVIDED FROM WIND POWER PLANT AUGMENTED WITH ENERGY STORAGE By Philip KJAER, Rasmus LAERKE, German TARNOWSKI	[View] [Download]
Abstract: This paper presents a scheme to augment a wind power plant with energy storage and apply combined controls for provision of frequency support, inertial response and power oscillation damping. Practical experience from a power plant configured with 12MW wind generation and 1.6MW energy storage is discussed, including sample results from tests of the ancillary services functionality.

	Integration of Batteries into a Modular Multilevel Converter By Markus SCHROEDER, Johann JAEGER, Stefan HENNINGER, Andreja RASIC, Hubert RUBENBAUER, Holger LEU	[View] [Download]
Abstract: In this paper the challenges of integrating batteries into the Modular Multilevel Converter are described. For this purpose, the technology of this converter topology is briefly introduced. An overview on already available products of battery energy storage systems is given. Based on that, a control concept for a DC-to-DC converter connecting a battery to a module of the Modular Multilevel Converter is presented. This concept contains an additional energy balancing algorithm. Several operating points of the whole system with integrated batteries are simulated. The paper is topped off with measurement results of a started-up hardware setup that is equipped with emulated DC-to-DC converters.

	Optimal Design of the Modular Multilevel Converter for an Energy Storage System Based on Split Batteries By Andre HILLERS, Juergen BIELA	[View] [Download]
Abstract: This paper presents the optimal design of a modular multilevel converter (MMC) for use in a stand-alone high power energy storage system based on split batteries (sBESS). The MMC allows for the sBESS to connect directly to the medium-voltage grid without the need for a line-transformer.A free parameter variation is performed to compare designs with different numbers of modules and different power semiconductors.Many commercially available IGBTs were found to be overdimensioned for the 5MW, 20kV target system, and better results were obtained with optimized assemblies.When the converter is designed with just a few more modules than absolutely necessary, the total size of the passive components can be reduced drastically, while the power losses increase only marginally.An attractive candidate system is given a closer look, for which a peak power-conversion efficiency of 99.3 is predicted (not including power losses in the line-filter and in the dc-dc converters to interface the batteries)