EPE Association: EPE 2019 - DS2e: Advanced Power Converter Topologies III

EPE 2019 - DS2e: Advanced Power Converter Topologies III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 02: Power Converter Topologies and Design > EPE 2019 - DS2e: Advanced Power Converter Topologies III

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   A Simple SiC MOSFET Three Level Inverter Topology for High Performance Shunt Active Power Filter
By Rodrigo GUZMAN ITURRA [View]
[Download]

Abstract: A highly efficient three level (3L) topology based entirely in silicon carbide (SiC) semiconductors for a shunt active power filter is presented. The proposed topology has an efficiency superior to conventional all SiC 3L topologies for switching frequencies above 70 kHz. Further, for high currents, the proposed topology has the advantage that can be built just by cascading two 2L SiC modules.

   Advanced DC/DC Full SiC Converter for On-Board Heavy Traction Applications
By Fioravante FASCE [View]
[Download]

Abstract: The aim of this work has been the design and the manufacture of a DC/DC converter as a power supplyfor onboard rolling stock auxiliary systems. The converter is designed and made by means of SiliconCarbide device technology in order to achieve a compact and efficient design. Four modules connectedin series as input stage can manage the nominal voltage of 3.6kV and the parallel connected outputstages provide 45.5kW at 720Vdc.

   Bi-directional Boost Converter for Emergency Lighting
By Kumar ARULANDU [View]
[Download]

Abstract: This paper presents a distributed storage/emergency lighting upgrade circuit that can be added to LED lighting fixtures. In contrast to conventional designs that are mostly supplied by a voltage source, we present an example of an emergency lighting circuit that is supplied by a constant current source (LED driver) in charging/ lighting mode. We also compare the performance of the same circuit when it is supplied by a voltage source in emergency lighting mode by the battery. Notwithstanding its low component count, the discussed concept reaches an efficiency of 94\%, and has a simple control scheme that provides dimming functionality for non-dimmable LED drivers.

   Characteristics Comparison of Multiple Dual Active Bridge Converter with Respect to The Difference in The Connection Configuration
By Takanobu OHNO [View]
[Download]

Abstract: This paper investigates the influence of the connection configuration of two dual active bridge (DAB) converters for the battery charger on their characteristics. Characteristics differences are examined between two configurations, which are DC-link Input Series Output Parallel (DC-ISOP) and AC-link Input Series Output Parallel (AC-ISOP) topology. In addition, the operation method of the AC-ISOP topology is investigated; and it is derived that AC-ISOP topology has higher current control capability than DC-ISOP topology from frequency domain analysis. Experimental results show the comparison of the operation of two connection configurations. As a result, in addition to AC-ISOP DAB converter is equivalent to DC-ISOP DAB converter under the specific condition, it is clarified that AC-ISOP DAB converter has higher harmonic components control capability than DC-ISOP DAB converter.

   Comparison of Three-Phase Voltage Source Converter Topologies for Electric High-Speed Drives Application
By Giorgo KAPINO [View]
[Download]

Abstract: In this paper, a comparison is performed between different three-phase topologies for a high-speed electricmotor drive application. The two-level topology utilizing Silicon Carbide switching devices is comparedto multilevel topologies in regards to their respective losses and efficiency.

   Enhanced Circulating-current Control for the Modular Multilevel Matrix Converter Based on Model Predictive Control
By Matías URRUTIA [View]
[Download]

Abstract: This article presents a novel circulating current control scheme for the Modular Multilevel Matrix Converter (M3C). The proposed method is based on a Model Predictive Control strategy (MPC), where an optimization problem is defined for minimizing the tracking error of the circulating currents. The output of the control scheme are circulating voltage references that are defined by a suitable linear transform. The effectiveness of this strategy is compared with a traditional scheme by simulation results of a M3C prototype composed of 27 modules.The reported results exhibit an important enhancement in the regulation of arm currents, specially during transient performance.

   Exponential Modular Multilevel Converter for Low Voltage Applications
By Manuel KUDER [View]
[Download]

Abstract: This paper presents the structure and control of a single phase Exponential Modular Multilevel Converter (EMMC), which works as a bidirectional AC/DC converter. In addition to the main H-bridge converter, it uses series connected H-bridges with DC link capacitors. The nominal voltage rating of the capacitors is increased with each module by factor of two. In this manner, the number of output voltage levels exponentially increases with the number of series connected H-bridges. By using low-voltage MOSFETs it is possible to achieve a very high efficiency, especially at partial loading. The high number of voltage levels reduces the output voltage THD, while using a low switching frequency. Thus, the required grid filter size can be substantially reduced. Furthermore, the additional capacitor modules increase the nominal output voltage at the AC side, so that the flow of the active and reactive power can be dynamically adjusted. Therefore, the EMMC could be used, for instance, as a vehicle charger directly connected to the grid.

   FIXED FREQUENCY RESONANT CONVERTER CONTROLLED WITH VARIABLE INDUCTOR FOR ELECTROSTATIC PRECIPITATOR
By Fernando GARCÍA DÍAZ [View]
[Download]

Abstract: Electrostatic Precipitators are a solution to avoid the emission of pollutant particles but this technology requires a pulsed power supply of tens of KV. This paper describes the analysis and experimental results of a Parallel Resonant Converter operated at _xed switching frequency generating the pulsed output, using a variable inductor

   Interleaved inverter with kinetic energy storage for increasing short circuit current
By Dariusz ZIELINSKI [View]
[Download]

Abstract: This paper presents the novel method of increasing short circuit current by means of interleaved power converter combined with kinetic energy storage. The proposed method provides a way to increase short circuit current delivered to circuit breakers without increasing overall cost of the power inverter. Use of interleaved topology allows for smooth connecting and disconnecting of kinetic energy storage to the system, which is done by temporarily disconnecting one of the inverters from the grid and using it to start spinning and synchronizing the flywheel of the energy storage to the island. It also reduces overall distortions generated by inverter during normal operation. This paper proposes a control algorithm and a method which allow to increase safety of the end users by increasing current flowing through circuit breakers during short circuits under island conditions. The proposed algorithm was tested in laboratory and results show that this solution has great potential in microgrid applications.

   Optimal 3D Space Vector Modulation for Packed-U-Cells Converter
By Dimas Alã SCHUETZ [View]
[Download]

Abstract: In this paper, a new optimal 3D Space Vector Modulation (SVM) for PUC5 converter is proposed. The algorithm add a common-mode voltage to the phase reference voltage that impose a trajectory for the voltage vector that lies over the external faces of the 3D Space Vector (SV) diagram. As a result, just three vectors are needed to synthesize the reference voltage. Compared to the classical 2D SV diagrams, the 3D SV diagram for PUC5, with the considered common-mode voltage, has not redundancies in phase coordinates, which requires a low computational effort for its implementation. In other hand, the vectors in phase coordinates, when described in switching states, can have up to four redundancies. This redundancies are used for minimizing a cost function composed by the ripple of the DC capacitor and the number of commutations of the semiconductor devices. In addition, the PUC5 topology presents some switches submitted to twice the blocking voltage of the others. To address this issue it is considered different weights in the cost function for these switches, which make it possible to reduce the overall commutation losses. The proposed modulation algorithm has been validated by extensive simulations. Furthermore, comparisons with other consolidated approaches in terms of Total Harmonic Distortion (THD), Weighted Total Harmonic Distortion (WTHD), capacitor voltage ripple and number of commutations demonstrate the good performance of the proposed SVM algorithm.

   Overvoltage Mitigation of Medium Voltage Electric Drives with Long Cables using Multilevel-Converters and Passive Filters
By Georgios MADEMLIS [View]
[Download]

Abstract: Variable-speed drives with long cables between the electrical machine and the power converters suffer from overvoltages at the connection terminals of the cables. These overvoltages which are caused by reflections of the PWM voltage pulses to the two ends of the cable are investigated in this paper. Suitable passive filters are proposed in order to mitigate the overvoltages to an acceptable level, which is not harmful for the devices of the system. Additionally, the use of multilevel power converters can help to minimize the size of the passive filters. The filter design for drives with up to 7-level converters is described in this paper and simulations results on LTspice are presented in order to validate the mathematical analysis.

EPE 2019 - DS2e: Advanced Power Converter Topologies III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 02: Power Converter Topologies and Design > EPE 2019 - DS2e: Advanced Power Converter Topologies III
	[return to parent folder]

	A Simple SiC MOSFET Three Level Inverter Topology for High Performance Shunt Active Power Filter By Rodrigo GUZMAN ITURRA	[View] [Download]
Abstract: A highly efficient three level (3L) topology based entirely in silicon carbide (SiC) semiconductors for a shunt active power filter is presented. The proposed topology has an efficiency superior to conventional all SiC 3L topologies for switching frequencies above 70 kHz. Further, for high currents, the proposed topology has the advantage that can be built just by cascading two 2L SiC modules.

	Advanced DC/DC Full SiC Converter for On-Board Heavy Traction Applications By Fioravante FASCE	[View] [Download]
Abstract: The aim of this work has been the design and the manufacture of a DC/DC converter as a power supplyfor onboard rolling stock auxiliary systems. The converter is designed and made by means of SiliconCarbide device technology in order to achieve a compact and efficient design. Four modules connectedin series as input stage can manage the nominal voltage of 3.6kV and the parallel connected outputstages provide 45.5kW at 720Vdc.

	Bi-directional Boost Converter for Emergency Lighting By Kumar ARULANDU	[View] [Download]
Abstract: This paper presents a distributed storage/emergency lighting upgrade circuit that can be added to LED lighting fixtures. In contrast to conventional designs that are mostly supplied by a voltage source, we present an example of an emergency lighting circuit that is supplied by a constant current source (LED driver) in charging/ lighting mode. We also compare the performance of the same circuit when it is supplied by a voltage source in emergency lighting mode by the battery. Notwithstanding its low component count, the discussed concept reaches an efficiency of 94\%, and has a simple control scheme that provides dimming functionality for non-dimmable LED drivers.

	Characteristics Comparison of Multiple Dual Active Bridge Converter with Respect to The Difference in The Connection Configuration By Takanobu OHNO	[View] [Download]
Abstract: This paper investigates the influence of the connection configuration of two dual active bridge (DAB) converters for the battery charger on their characteristics. Characteristics differences are examined between two configurations, which are DC-link Input Series Output Parallel (DC-ISOP) and AC-link Input Series Output Parallel (AC-ISOP) topology. In addition, the operation method of the AC-ISOP topology is investigated; and it is derived that AC-ISOP topology has higher current control capability than DC-ISOP topology from frequency domain analysis. Experimental results show the comparison of the operation of two connection configurations. As a result, in addition to AC-ISOP DAB converter is equivalent to DC-ISOP DAB converter under the specific condition, it is clarified that AC-ISOP DAB converter has higher harmonic components control capability than DC-ISOP DAB converter.

	Comparison of Three-Phase Voltage Source Converter Topologies for Electric High-Speed Drives Application By Giorgo KAPINO	[View] [Download]
Abstract: In this paper, a comparison is performed between different three-phase topologies for a high-speed electricmotor drive application. The two-level topology utilizing Silicon Carbide switching devices is comparedto multilevel topologies in regards to their respective losses and efficiency.

	Enhanced Circulating-current Control for the Modular Multilevel Matrix Converter Based on Model Predictive Control By Matías URRUTIA	[View] [Download]
Abstract: This article presents a novel circulating current control scheme for the Modular Multilevel Matrix Converter (M3C). The proposed method is based on a Model Predictive Control strategy (MPC), where an optimization problem is defined for minimizing the tracking error of the circulating currents. The output of the control scheme are circulating voltage references that are defined by a suitable linear transform. The effectiveness of this strategy is compared with a traditional scheme by simulation results of a M3C prototype composed of 27 modules.The reported results exhibit an important enhancement in the regulation of arm currents, specially during transient performance.

	Exponential Modular Multilevel Converter for Low Voltage Applications By Manuel KUDER	[View] [Download]
Abstract: This paper presents the structure and control of a single phase Exponential Modular Multilevel Converter (EMMC), which works as a bidirectional AC/DC converter. In addition to the main H-bridge converter, it uses series connected H-bridges with DC link capacitors. The nominal voltage rating of the capacitors is increased with each module by factor of two. In this manner, the number of output voltage levels exponentially increases with the number of series connected H-bridges. By using low-voltage MOSFETs it is possible to achieve a very high efficiency, especially at partial loading. The high number of voltage levels reduces the output voltage THD, while using a low switching frequency. Thus, the required grid filter size can be substantially reduced. Furthermore, the additional capacitor modules increase the nominal output voltage at the AC side, so that the flow of the active and reactive power can be dynamically adjusted. Therefore, the EMMC could be used, for instance, as a vehicle charger directly connected to the grid.

	FIXED FREQUENCY RESONANT CONVERTER CONTROLLED WITH VARIABLE INDUCTOR FOR ELECTROSTATIC PRECIPITATOR By Fernando GARCÍA DÍAZ	[View] [Download]
Abstract: Electrostatic Precipitators are a solution to avoid the emission of pollutant particles but this technology requires a pulsed power supply of tens of KV. This paper describes the analysis and experimental results of a Parallel Resonant Converter operated at _xed switching frequency generating the pulsed output, using a variable inductor

	Interleaved inverter with kinetic energy storage for increasing short circuit current By Dariusz ZIELINSKI	[View] [Download]
Abstract: This paper presents the novel method of increasing short circuit current by means of interleaved power converter combined with kinetic energy storage. The proposed method provides a way to increase short circuit current delivered to circuit breakers without increasing overall cost of the power inverter. Use of interleaved topology allows for smooth connecting and disconnecting of kinetic energy storage to the system, which is done by temporarily disconnecting one of the inverters from the grid and using it to start spinning and synchronizing the flywheel of the energy storage to the island. It also reduces overall distortions generated by inverter during normal operation. This paper proposes a control algorithm and a method which allow to increase safety of the end users by increasing current flowing through circuit breakers during short circuits under island conditions. The proposed algorithm was tested in laboratory and results show that this solution has great potential in microgrid applications.

	Optimal 3D Space Vector Modulation for Packed-U-Cells Converter By Dimas Alã SCHUETZ	[View] [Download]
Abstract: In this paper, a new optimal 3D Space Vector Modulation (SVM) for PUC5 converter is proposed. The algorithm add a common-mode voltage to the phase reference voltage that impose a trajectory for the voltage vector that lies over the external faces of the 3D Space Vector (SV) diagram. As a result, just three vectors are needed to synthesize the reference voltage. Compared to the classical 2D SV diagrams, the 3D SV diagram for PUC5, with the considered common-mode voltage, has not redundancies in phase coordinates, which requires a low computational effort for its implementation. In other hand, the vectors in phase coordinates, when described in switching states, can have up to four redundancies. This redundancies are used for minimizing a cost function composed by the ripple of the DC capacitor and the number of commutations of the semiconductor devices. In addition, the PUC5 topology presents some switches submitted to twice the blocking voltage of the others. To address this issue it is considered different weights in the cost function for these switches, which make it possible to reduce the overall commutation losses. The proposed modulation algorithm has been validated by extensive simulations. Furthermore, comparisons with other consolidated approaches in terms of Total Harmonic Distortion (THD), Weighted Total Harmonic Distortion (WTHD), capacitor voltage ripple and number of commutations demonstrate the good performance of the proposed SVM algorithm.

	Overvoltage Mitigation of Medium Voltage Electric Drives with Long Cables using Multilevel-Converters and Passive Filters By Georgios MADEMLIS	[View] [Download]
Abstract: Variable-speed drives with long cables between the electrical machine and the power converters suffer from overvoltages at the connection terminals of the cables. These overvoltages which are caused by reflections of the PWM voltage pulses to the two ends of the cable are investigated in this paper. Suitable passive filters are proposed in order to mitigate the overvoltages to an acceptable level, which is not harmful for the devices of the system. Additionally, the use of multilevel power converters can help to minimize the size of the passive filters. The filter design for drives with up to 7-level converters is described in this paper and simulations results on LTspice are presented in order to validate the mathematical analysis.