EPE Association: EPE 2011 - LS3e: Topic 05: High Power Multi-Level Converters and Voltage Regulator Modules (III)

EPE 2011 - LS3e: Topic 05: High Power Multi-Level Converters and Voltage Regulator Modules (III)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS3e: Topic 05: High Power Multi-Level Converters and Voltage Regulator Modules (III)

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   A New 3-Phase Direct Modular Multilevel Converter
By Axel MERTENS, Lennart BARUSCHKA [View]
[Download]

Abstract: In this paper, a novel 3-phase AC/AC modular multilevel converter is presented and analyzed. Characteristic diagrams obtained from an analytic simulation model are shown in order to discuss the circuit’s properties and how it can be used to advantage. The converter is compared to the M2LC in back-to-back configuration as a reference topology. Needing only half the number of modules, its energy storage requirements are also a lot lower than the M2LC’s. Measurements from a laboratory setup demonstrate proper operation of the new topology and verify the analyses.

   Cascaded H-Bridge with Bidirectional Boost Converters for Energy Storage
By Ionut TRINTIS, Stig MUNK-NIELSEN, Remus TEODORESCU [View]
[Download]

Abstract: This paper presents the design and control of a cascaded H-bridge converter for energy storage withbidirectional boost converter as charge/discharge unit. The disadvantage of the second harmonic onthe main energy storage unit as well as its voltage variation with the state of charge is solved by thisstructure. The independent phase grid control is proposed for this topology. This strategy is able tocontrol the average dc-link voltage for each phase independently and to balance the cells capacitorsvoltages. The balance of the energy storage units is achieved by controlling independently each cellcharge/discharge current, together with the capacitors voltage control and balancing. Converter cellloss distribution and total loss over a wide battery voltage variation is calculated for charge/dischargeoperation modes for a 4.16 kV grid coupling point and 5 MW rated power.

   Dynamic Modeling of Modular Multilevel Converters
By Lennart HARNEFORS, Staffan NORRGA, Antonios ANTONOPOULOS, Hans-Peter NEE [View]
[Download]

Abstract: Theory for the dynamics of modular multilevel converters is developed in this paper. It is shownthat the sum capacitor voltage in each arm often can be considered instead of the individualcapacitor voltages, thereby significantly reducing the complexity of the system model. A selectionof the so-called insertion indices, which compensates for the sum-capacitor-voltage ripples,is considered. The system which results for this selection is analyzed, and is shown to be asymptoticallystable. Finally, explicit formulas for the steady-state sum-capacitor-voltage ripples arederived.

EPE 2011 - LS3e: Topic 05: High Power Multi-Level Converters and Voltage Regulator Modules (III)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS3e: Topic 05: High Power Multi-Level Converters and Voltage Regulator Modules (III)
	[return to parent folder]

	A New 3-Phase Direct Modular Multilevel Converter By Axel MERTENS, Lennart BARUSCHKA	[View] [Download]
Abstract: In this paper, a novel 3-phase AC/AC modular multilevel converter is presented and analyzed. Characteristic diagrams obtained from an analytic simulation model are shown in order to discuss the circuit’s properties and how it can be used to advantage. The converter is compared to the M2LC in back-to-back configuration as a reference topology. Needing only half the number of modules, its energy storage requirements are also a lot lower than the M2LC’s. Measurements from a laboratory setup demonstrate proper operation of the new topology and verify the analyses.

	Cascaded H-Bridge with Bidirectional Boost Converters for Energy Storage By Ionut TRINTIS, Stig MUNK-NIELSEN, Remus TEODORESCU	[View] [Download]
Abstract: This paper presents the design and control of a cascaded H-bridge converter for energy storage withbidirectional boost converter as charge/discharge unit. The disadvantage of the second harmonic onthe main energy storage unit as well as its voltage variation with the state of charge is solved by thisstructure. The independent phase grid control is proposed for this topology. This strategy is able tocontrol the average dc-link voltage for each phase independently and to balance the cells capacitorsvoltages. The balance of the energy storage units is achieved by controlling independently each cellcharge/discharge current, together with the capacitors voltage control and balancing. Converter cellloss distribution and total loss over a wide battery voltage variation is calculated for charge/dischargeoperation modes for a 4.16 kV grid coupling point and 5 MW rated power.

	Dynamic Modeling of Modular Multilevel Converters By Lennart HARNEFORS, Staffan NORRGA, Antonios ANTONOPOULOS, Hans-Peter NEE	[View] [Download]
Abstract: Theory for the dynamics of modular multilevel converters is developed in this paper. It is shownthat the sum capacitor voltage in each arm often can be considered instead of the individualcapacitor voltages, thereby significantly reducing the complexity of the system model. A selectionof the so-called insertion indices, which compensates for the sum-capacitor-voltage ripples,is considered. The system which results for this selection is analyzed, and is shown to be asymptoticallystable. Finally, explicit formulas for the steady-state sum-capacitor-voltage ripples arederived.