EPE Association: EPE 2017 - LS6e: Industry Specific Energy Conversion and Conditioning Technologies

EPE 2017 - LS6e: Industry Specific Energy Conversion and Conditioning Technologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2017 - LS6e: Industry Specific Energy Conversion and Conditioning Technologies

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   A SOFT-SWITCHING MODULAR MULTILEVEL CONVERTER FOR RAILWAY TRACTION SYSTEMS
By Stefano FARNESI [View]
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Abstract: The AC/AC single-phase/single-phase Modular Multilevel Converter (MMC) presents very interesting features for the realization of a Medium Frequency Power Electronic Transformer for traction applications, in AC-fed or multisystem railway rolling stock, like locomotives, Electric Multiple Units (EMU), high-speed units, and so on. Aiming to maximize the output frequency of the converter, i.e. the operating frequency of the medium frequency transformer (m.f.t.) and/or to maximize the conversion efficiency, in this paper a proposal is presented, exploiting the opportunities offered by known soft-switching topologies. Simulation results fully validate this idea: in each MMC converter's submodule the H-bridge main semiconductor devices commutate in Zero-Voltage Switching (ZVS) conditions, with so much reduced losses that the switching frequency can be pushed-up toward unimaginable levels respect the classical hard-switching commutation, using usual silicon devices. More, the whole MMC converter operation remains substantially the same, because the soft-switching behaviour inside the single submodules does non disturb the operation of the overall MMC. The negative aspect is that the soft switching solution implies an appreciable increase in the overall amount of active and passive components, with obvious reflections on the reliability and costs issues. This article will discuss this theme with particular regard to the effects of simulation, loss assessment and power semiconductor sizing.

   A Stability Analysis on the Regenerative Brake Control System Focusing on Feeder Line Circuit Models of DC-Electrified Railway
By Hiroyasu KOBAYASHI [View]
[Download]

Abstract: In this paper, stability of regenerative brake control system is studied, focusing on the difference in the feeder line circuit model on factory test conditions and actual load conditions. The factory test is always carried out to determine the gain of regenerative brake control system because there are restrictions in the on-track test. However, the influence on the difference of the circuit configurations on the stability of the traction circuit and suppression of overvoltage has not been studied. In this paper, the authors revealed that the factory test condition is equivalent to the actual condition from the viewpoint of stability of traction circuit from the analysis on the pole assignment of the closed-loop transfer function of each models. Also, these results of theoretical analysis are verified by the numerical simulation. From results of this paper, it is theoretically revealed that the stability of the traction circuit in the actual condition could be guaranteed by the factory test. This paper contributes to reduce the process for tuning the gain of the regenerative brake control system in the on-track test.

   High Frequency Power Distribution Unit (HFPDU) for MRI systems
By Jayanti GANESH [View]
[Download]

Abstract: To reduce the cost and footprint of a Magnetic Resonant Imaging (MRI) scanner setup in a hospital, a modification in the existing power architecture of the MRI system has been proposed. A high frequency alternative for the frontend bulky low frequency transformer has been proposed. The implementation challenges and workaround solutions for the High Frequency Power Distribution Unit (HFPDU) has been explored and the experimental setup and results are discussed in the paper

   Impact of voltage shape on efficiency of ozone generation
By Jacek KOLEK [View]
[Download]

Abstract: Dielectric Barrier Discharge (DBD) reactors are widely used for industrial ozone generation. Paperpresents impact of voltage shape of different power supply topologies for DBD on ozone efficiencyproduction. Results of five voltage shapes of three different power supply topologies were presentedand discussed. Investigation shows that selection of voltage shape and as a result power supplytopology is crucial factor determining the performance of ozone production.

EPE 2017 - LS6e: Industry Specific Energy Conversion and Conditioning Technologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 09: Industry-Specific Energy Conversion and Conditioning Technologies > EPE 2017 - LS6e: Industry Specific Energy Conversion and Conditioning Technologies
	[return to parent folder]

	A SOFT-SWITCHING MODULAR MULTILEVEL CONVERTER FOR RAILWAY TRACTION SYSTEMS By Stefano FARNESI	[View] [Download]
Abstract: The AC/AC single-phase/single-phase Modular Multilevel Converter (MMC) presents very interesting features for the realization of a Medium Frequency Power Electronic Transformer for traction applications, in AC-fed or multisystem railway rolling stock, like locomotives, Electric Multiple Units (EMU), high-speed units, and so on. Aiming to maximize the output frequency of the converter, i.e. the operating frequency of the medium frequency transformer (m.f.t.) and/or to maximize the conversion efficiency, in this paper a proposal is presented, exploiting the opportunities offered by known soft-switching topologies. Simulation results fully validate this idea: in each MMC converter's submodule the H-bridge main semiconductor devices commutate in Zero-Voltage Switching (ZVS) conditions, with so much reduced losses that the switching frequency can be pushed-up toward unimaginable levels respect the classical hard-switching commutation, using usual silicon devices. More, the whole MMC converter operation remains substantially the same, because the soft-switching behaviour inside the single submodules does non disturb the operation of the overall MMC. The negative aspect is that the soft switching solution implies an appreciable increase in the overall amount of active and passive components, with obvious reflections on the reliability and costs issues. This article will discuss this theme with particular regard to the effects of simulation, loss assessment and power semiconductor sizing.

	A Stability Analysis on the Regenerative Brake Control System Focusing on Feeder Line Circuit Models of DC-Electrified Railway By Hiroyasu KOBAYASHI	[View] [Download]
Abstract: In this paper, stability of regenerative brake control system is studied, focusing on the difference in the feeder line circuit model on factory test conditions and actual load conditions. The factory test is always carried out to determine the gain of regenerative brake control system because there are restrictions in the on-track test. However, the influence on the difference of the circuit configurations on the stability of the traction circuit and suppression of overvoltage has not been studied. In this paper, the authors revealed that the factory test condition is equivalent to the actual condition from the viewpoint of stability of traction circuit from the analysis on the pole assignment of the closed-loop transfer function of each models. Also, these results of theoretical analysis are verified by the numerical simulation. From results of this paper, it is theoretically revealed that the stability of the traction circuit in the actual condition could be guaranteed by the factory test. This paper contributes to reduce the process for tuning the gain of the regenerative brake control system in the on-track test.

	High Frequency Power Distribution Unit (HFPDU) for MRI systems By Jayanti GANESH	[View] [Download]
Abstract: To reduce the cost and footprint of a Magnetic Resonant Imaging (MRI) scanner setup in a hospital, a modification in the existing power architecture of the MRI system has been proposed. A high frequency alternative for the frontend bulky low frequency transformer has been proposed. The implementation challenges and workaround solutions for the High Frequency Power Distribution Unit (HFPDU) has been explored and the experimental setup and results are discussed in the paper

	Impact of voltage shape on efficiency of ozone generation By Jacek KOLEK	[View] [Download]
Abstract: Dielectric Barrier Discharge (DBD) reactors are widely used for industrial ozone generation. Paperpresents impact of voltage shape of different power supply topologies for DBD on ozone efficiencyproduction. Results of five voltage shapes of three different power supply topologies were presentedand discussed. Investigation shows that selection of voltage shape and as a result power supplytopology is crucial factor determining the performance of ozone production.