EPE Association: EPE 2015 - LS1a: Advanced Power Converter Topologies

EPE 2015 - LS1a: Advanced Power Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 02: Power Converter Topologies and Design > EPE 2015 - LS1a: Advanced Power Converter Topologies

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   A Hybrid Modular Multilevel DC/AC Converter
By Jakub KUCKA [View]
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Abstract: This paper presents a hybrid modular multilevel topology for medium voltage drives requiring low frequencies and a high start-up torque. It operates from a DC supply which makes it easy to connect several drives to a single active front end converter, optionally also enabling galvanic isolation. The topology is compared to the modular multilevel matrix converter (MMMC) and to the modular multilevel converter (M2LC). In both cases, it shows very promising results.

   A Parallel Three-Phase Converter System for Ripple Current Compensation and Passive Filter Reduction
By Julian ENDRES [View]
[Download]

Abstract: In this paper a two-parallel inverter topology is introduced which combines the advantages of IGBT'swith the benefits of SiC-MOSFET's to achieve an ideal output current. The common control algorithmwhich is implemented on a FPGA utilizes the IGBT inverter for carrying the major load current, whilethe SiC inverter is only used for ripple current compensation. In this configuration the system provides an active current harmonic canceling technique with the potential to save passive filter elements. This paperpresents a mathematical model to characterize the circulating currents and to design an ideal controllerthat can be used to identify the theoretical limits of the system. A first practical implementation on testbench with corresponding measurement results demonstrate the feasibility and benefit of the proposedhybrid inverter structure.

   Analysis of the dc-link stability for the stacked polyphase bridges converter
By Mojgan NIKOUIE HARNEFORS [View]
[Download]

Abstract: This paper presents an analysis of the capacitor voltage stability for a stacked polyphase bridges (SPB)type converter. The SPB converter comprises of several submodules which are connected in series.Therefore, stability of the dc-link voltage is very important to investigate. From the analysis, a correspondingcontroller and an analytical expression for stability are derived. The proposed controller andthe associated stability condition are verified in a simulation environment and on a small experimentalsetup.

   Validation of a Reduced Order Model for Modular Multilevel Converters and Analysis of Circulating Current
By Andres LOPEZ [View]
[Download]

Abstract: In this paper, a recently proposed reduced order model for Modular Multilevel Converters is validated and used to analyze the role of the circulating current in the power transfer inside the converter. This model simplifies the analysis of the converter by removing the discontinuities and reducing the order of the system. Therefore, continuous analytical expressions can be obtained and analyzed. The reduced order is used to model the dynamics of the state space variables of the converter. The results show that, the higher the number of modules used in the converter, the more accurate are the results of the model. Moreover, the influence of different harmonic components of the circulating current over the module's voltage ripple, and the influence of the circulating current components on the power transfer in the converter are analyzed. Inter alia, the analysis shows the importance of the even order harmonics of the circulating current in the reactive power transfer within the converter.

EPE 2015 - LS1a: Advanced Power Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 02: Power Converter Topologies and Design > EPE 2015 - LS1a: Advanced Power Converter Topologies
	[return to parent folder]

	A Hybrid Modular Multilevel DC/AC Converter By Jakub KUCKA	[View] [Download]
Abstract: This paper presents a hybrid modular multilevel topology for medium voltage drives requiring low frequencies and a high start-up torque. It operates from a DC supply which makes it easy to connect several drives to a single active front end converter, optionally also enabling galvanic isolation. The topology is compared to the modular multilevel matrix converter (MMMC) and to the modular multilevel converter (M2LC). In both cases, it shows very promising results.

	A Parallel Three-Phase Converter System for Ripple Current Compensation and Passive Filter Reduction By Julian ENDRES	[View] [Download]
Abstract: In this paper a two-parallel inverter topology is introduced which combines the advantages of IGBT'swith the benefits of SiC-MOSFET's to achieve an ideal output current. The common control algorithmwhich is implemented on a FPGA utilizes the IGBT inverter for carrying the major load current, whilethe SiC inverter is only used for ripple current compensation. In this configuration the system provides an active current harmonic canceling technique with the potential to save passive filter elements. This paperpresents a mathematical model to characterize the circulating currents and to design an ideal controllerthat can be used to identify the theoretical limits of the system. A first practical implementation on testbench with corresponding measurement results demonstrate the feasibility and benefit of the proposedhybrid inverter structure.

	Analysis of the dc-link stability for the stacked polyphase bridges converter By Mojgan NIKOUIE HARNEFORS	[View] [Download]
Abstract: This paper presents an analysis of the capacitor voltage stability for a stacked polyphase bridges (SPB)type converter. The SPB converter comprises of several submodules which are connected in series.Therefore, stability of the dc-link voltage is very important to investigate. From the analysis, a correspondingcontroller and an analytical expression for stability are derived. The proposed controller andthe associated stability condition are verified in a simulation environment and on a small experimentalsetup.

	Validation of a Reduced Order Model for Modular Multilevel Converters and Analysis of Circulating Current By Andres LOPEZ	[View] [Download]
Abstract: In this paper, a recently proposed reduced order model for Modular Multilevel Converters is validated and used to analyze the role of the circulating current in the power transfer inside the converter. This model simplifies the analysis of the converter by removing the discontinuities and reducing the order of the system. Therefore, continuous analytical expressions can be obtained and analyzed. The reduced order is used to model the dynamics of the state space variables of the converter. The results show that, the higher the number of modules used in the converter, the more accurate are the results of the model. Moreover, the influence of different harmonic components of the circulating current over the module's voltage ripple, and the influence of the circulating current components on the power transfer in the converter are analyzed. Inter alia, the analysis shows the importance of the even order harmonics of the circulating current in the reactive power transfer within the converter.