EPE Association: EPE 2015 - LS2a: Advanced Power Converter Topologies

EPE 2015 - LS2a: 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 - LS2a: Advanced Power Converter Topologies

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   Analysis of Modular Multilevel Converters (MMC) with DC Short Circuit Fault Blocking Capability in Bipolar HVDC Transmission Systems
By Alireza NAMI [View]
[Download]

Abstract: This paper analyzes the station-internal phase-to-ground fault in bipolar HVDC transmission systems. An overvoltage problem due to the existence of the bipolar cells in the modular multilevel converter (MMC) arms closer to the grounding pole are presented. Consequently, a new hybrid arm MMC is proposed to overcome the overvoltage problem while providing the benefits of: a lower number of cells, fewer switching devices and lower conduction losses. Guidelines are developed and confirmed by simulation results to determine the required number of cells to block the DC side fault.

   Cascaded U-Cell multilevel converter for STATCOM applications
By SHAMBHU SAU [View]
[Download]

Abstract: Cascaded H-bridge (CHB) converter is one of the popular solution for medium voltage transformerlessstatic synchronous compensator (STATCOM) applications. The semiconductor devices of this converterare switched at low frequency. Therefore, conduction losses contribute to major part of the losses inthis converter. To reduce the conduction losses, a cascaded U-cell (CUC) multilevel converter is derivedfrom CHB converter.The proposed converter has less number of switches compared to CHB converterand therefore reduces the overall losses of the converter. Converter circuit topology, control strategy andsimulation results for static var compensation are presented. The losses are estimated and compared withthat of CHB converter to verify the reduction of overall losses in proposed converter.

   Experimental Investigations on Grid-connected AC/DC Converter Based on Three-phase SiC MOSFET Module
By Szymon PIASECKI [View]
[Download]

Abstract: The paper presents a high-efficiency grid-connected 10 kVA AC/DC converter and its experimental verification during various operation modes. The converter was designed to operate with a natural convection cooling, which is possible due to performance of a three-phase SiC MOSFET module (1200V/50A) switching at 16 kHz. Moreover, a LCL filter is built with the inductors also optimized regarding low power losses. The AC/DC converter was investigated in active rectifier and grid-inverter mode with special focus on efficiency measurements. Typically, total losses are slightly above 1\% of the nominal power but in specific operation areas, such as an active rectifier mode, efficiency higher than 99\% was observed.

   Inductor Design Comparison of Three-wire and Four-wire Three-phase Voltage Source Converters in Power Factor Correction Applications
By Alireza KOUCHAKI [View]
[Download]

Abstract: This paper studies the inductor design for three-phase three-wire and four-wire power factor correction converter (PFC). Designing the efficient inductor for this converter (regardless of connecting the midpoint to the ground) requires a comprehensive knowledge of the inductor current and voltage behavior. Basically, this paper investigates how three and four wire PFC influence the inductor design in terms of size, losses, and overall efficiency of the converter. Since, the connection of the dc link midpoint to the ground changes the inductor current behavior from the three-wire counterpart. In this paper, the inductor behavior for both three-wire and four-wire PFC are analyzed. The analyses for two configurations are compared with respect to the single phase equivalent circuit, harmonic spectrum, high frequency ac copper losses, and core loss. Finally, two inductors are designed for 3 and 4 wire 5 kW PFC experimental setup and the experimental results show a good agreement with the analyses.

EPE 2015 - LS2a: 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 - LS2a: Advanced Power Converter Topologies
	[return to parent folder]

	Analysis of Modular Multilevel Converters (MMC) with DC Short Circuit Fault Blocking Capability in Bipolar HVDC Transmission Systems By Alireza NAMI	[View] [Download]
Abstract: This paper analyzes the station-internal phase-to-ground fault in bipolar HVDC transmission systems. An overvoltage problem due to the existence of the bipolar cells in the modular multilevel converter (MMC) arms closer to the grounding pole are presented. Consequently, a new hybrid arm MMC is proposed to overcome the overvoltage problem while providing the benefits of: a lower number of cells, fewer switching devices and lower conduction losses. Guidelines are developed and confirmed by simulation results to determine the required number of cells to block the DC side fault.

	Cascaded U-Cell multilevel converter for STATCOM applications By SHAMBHU SAU	[View] [Download]
Abstract: Cascaded H-bridge (CHB) converter is one of the popular solution for medium voltage transformerlessstatic synchronous compensator (STATCOM) applications. The semiconductor devices of this converterare switched at low frequency. Therefore, conduction losses contribute to major part of the losses inthis converter. To reduce the conduction losses, a cascaded U-cell (CUC) multilevel converter is derivedfrom CHB converter.The proposed converter has less number of switches compared to CHB converterand therefore reduces the overall losses of the converter. Converter circuit topology, control strategy andsimulation results for static var compensation are presented. The losses are estimated and compared withthat of CHB converter to verify the reduction of overall losses in proposed converter.

	Experimental Investigations on Grid-connected AC/DC Converter Based on Three-phase SiC MOSFET Module By Szymon PIASECKI	[View] [Download]
Abstract: The paper presents a high-efficiency grid-connected 10 kVA AC/DC converter and its experimental verification during various operation modes. The converter was designed to operate with a natural convection cooling, which is possible due to performance of a three-phase SiC MOSFET module (1200V/50A) switching at 16 kHz. Moreover, a LCL filter is built with the inductors also optimized regarding low power losses. The AC/DC converter was investigated in active rectifier and grid-inverter mode with special focus on efficiency measurements. Typically, total losses are slightly above 1\% of the nominal power but in specific operation areas, such as an active rectifier mode, efficiency higher than 99\% was observed.

	Inductor Design Comparison of Three-wire and Four-wire Three-phase Voltage Source Converters in Power Factor Correction Applications By Alireza KOUCHAKI	[View] [Download]
Abstract: This paper studies the inductor design for three-phase three-wire and four-wire power factor correction converter (PFC). Designing the efficient inductor for this converter (regardless of connecting the midpoint to the ground) requires a comprehensive knowledge of the inductor current and voltage behavior. Basically, this paper investigates how three and four wire PFC influence the inductor design in terms of size, losses, and overall efficiency of the converter. Since, the connection of the dc link midpoint to the ground changes the inductor current behavior from the three-wire counterpart. In this paper, the inductor behavior for both three-wire and four-wire PFC are analyzed. The analyses for two configurations are compared with respect to the single phase equivalent circuit, harmonic spectrum, high frequency ac copper losses, and core loss. Finally, two inductors are designed for 3 and 4 wire 5 kW PFC experimental setup and the experimental results show a good agreement with the analyses.