EPE Association: EPE 2020 - DS2f: Grid Connected Converters

EPE 2020 - DS2f: Grid Connected Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - DS2f: Grid Connected Converters

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   Analysis of the RMS current stress on the DC link capacitors of the four phase 3-level T-type voltage source converter
By Zoran MILETIC [View]
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Abstract: In the three phase four wire applications, three phases and neutral, often the loads are not well balanced; hence there is a flow of current through neutral conductor. In these applications, the voltage source converters have to handle return or neutral currents into the DC link. This paper presents analysis of the RMS current stress on the DC link capacitors of the four leg 3L T-type voltage source converter caused by unbalanced loads.

   Design and Control of a Virtual DC-Link for a full GaN-based Single Phase Converter with High Power Density
By Yugandhara WANKHEDE [View]
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Abstract: This paper presents a design and control approach of a virtual DC-Link for a full GaN-based single phase converter with high power density. Low frequency power ripple on the DC bus is an inherent problem for single phase PWM converter. The topology consists of a totem pole PFC with an added virtual DC-Link, which forces this low frequency power ripple on the DC output side to divert to an auxiliary capacitor. It results in significantly reduced required capacitance and e.g. enables the use of film capacitors instead of electrolytic capacitors. The proposed control for the topology is reduced to a minimum amount of sensor requirements while still maintaining the full functionality without bulky DC-link capacitors. Simulation and and experimental results up to 3 kW are provided to validate the performance of the proposed method.

   Design of modular low-profile frequency converter for multi-motor manipulators
By Zdenek KEHL [View]
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Abstract: A new modular low-profile indirect frequency converter is introduced. If fulfills several criterions as mechanical dimensions to fit standard 1U height 19" rack enclosures, energy recuperation, high power factor, high switching frequency and air cooling and high computational performance and connectivity of control system dedicated for special manipulators particularly.

   Full-Silicon 98.7\% Efficient Three-Phase Five-Level 3-port UPS Architecture with Wide Voltage Range Battery based on Multiplexed Topology
By Kepa ODRIOZOLA [View]
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Abstract: This paper proposes a new three-phase multilevel 3-port converter topology based on multiplexed topology concept which is especially intended for high-power Uninterruptible Power Supplies (UPS) applications with wide battery voltage range and well adapted for high-voltage step-down conversion ratio. Compared to other high-voltage conversion ratio Multi-Cell converters, the multiplexed concept allows cascading power conversion stages without any intermediate filter and optimizing power density. In the studied case it will be used to transfer power between a 1200V DC source and 400V/480V AC load and grid. The proposed converter topology achieves very high efficiency, up to 98,7\% in direct AC-to-AC power conversion mode using reduced number of silicon low blocking voltage semiconductor devices. The Hardware In the Loop (HIL) assessment has enabled the development of the modulation strategy and validate the performance of the converter. To validate the feasibility of the multiplexed concept of the 5L-Multiplexed 3-port topology for UPS applications a 100-kW hardware demonstrator featuring a volumetric power density of 3.68 kW/dm3 (60.3 W/in3) has been built.

   Power Decoupling Method of DC to Single-phase AC Converter using Flying capacitor DC/DC Converter with Boundary Current Mode
By Hiroki WATANABE [View]
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Abstract: The active power decoupling control method of flying capacitor DC/DC converter with the Boundary Current Mode (BCM) is considered in order to minimize the inductor in this paper. The validity of the proposed power decoupling control is confirmed by the experiment with 1 kW prototype circuit. As the experimental result, DC-link voltage fluctuation due to the double-line frequency power ripple is reduced by 85.6\% owing to the proposed control.

EPE 2020 - DS2f: Grid Connected Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - DS2f: Grid Connected Converters
	[return to parent folder]

	Analysis of the RMS current stress on the DC link capacitors of the four phase 3-level T-type voltage source converter By Zoran MILETIC	[View] [Download]
Abstract: In the three phase four wire applications, three phases and neutral, often the loads are not well balanced; hence there is a flow of current through neutral conductor. In these applications, the voltage source converters have to handle return or neutral currents into the DC link. This paper presents analysis of the RMS current stress on the DC link capacitors of the four leg 3L T-type voltage source converter caused by unbalanced loads.

	Design and Control of a Virtual DC-Link for a full GaN-based Single Phase Converter with High Power Density By Yugandhara WANKHEDE	[View] [Download]
Abstract: This paper presents a design and control approach of a virtual DC-Link for a full GaN-based single phase converter with high power density. Low frequency power ripple on the DC bus is an inherent problem for single phase PWM converter. The topology consists of a totem pole PFC with an added virtual DC-Link, which forces this low frequency power ripple on the DC output side to divert to an auxiliary capacitor. It results in significantly reduced required capacitance and e.g. enables the use of film capacitors instead of electrolytic capacitors. The proposed control for the topology is reduced to a minimum amount of sensor requirements while still maintaining the full functionality without bulky DC-link capacitors. Simulation and and experimental results up to 3 kW are provided to validate the performance of the proposed method.

	Design of modular low-profile frequency converter for multi-motor manipulators By Zdenek KEHL	[View] [Download]
Abstract: A new modular low-profile indirect frequency converter is introduced. If fulfills several criterions as mechanical dimensions to fit standard 1U height 19" rack enclosures, energy recuperation, high power factor, high switching frequency and air cooling and high computational performance and connectivity of control system dedicated for special manipulators particularly.

	Full-Silicon 98.7\% Efficient Three-Phase Five-Level 3-port UPS Architecture with Wide Voltage Range Battery based on Multiplexed Topology By Kepa ODRIOZOLA	[View] [Download]
Abstract: This paper proposes a new three-phase multilevel 3-port converter topology based on multiplexed topology concept which is especially intended for high-power Uninterruptible Power Supplies (UPS) applications with wide battery voltage range and well adapted for high-voltage step-down conversion ratio. Compared to other high-voltage conversion ratio Multi-Cell converters, the multiplexed concept allows cascading power conversion stages without any intermediate filter and optimizing power density. In the studied case it will be used to transfer power between a 1200V DC source and 400V/480V AC load and grid. The proposed converter topology achieves very high efficiency, up to 98,7\% in direct AC-to-AC power conversion mode using reduced number of silicon low blocking voltage semiconductor devices. The Hardware In the Loop (HIL) assessment has enabled the development of the modulation strategy and validate the performance of the converter. To validate the feasibility of the multiplexed concept of the 5L-Multiplexed 3-port topology for UPS applications a 100-kW hardware demonstrator featuring a volumetric power density of 3.68 kW/dm3 (60.3 W/in3) has been built.

	Power Decoupling Method of DC to Single-phase AC Converter using Flying capacitor DC/DC Converter with Boundary Current Mode By Hiroki WATANABE	[View] [Download]
Abstract: The active power decoupling control method of flying capacitor DC/DC converter with the Boundary Current Mode (BCM) is considered in order to minimize the inductor in this paper. The validity of the proposed power decoupling control is confirmed by the experiment with 1 kW prototype circuit. As the experimental result, DC-link voltage fluctuation due to the double-line frequency power ripple is reduced by 85.6\% owing to the proposed control.