EPE Association: EPE 2015 - LS4a: Advanced Power Converter Topologies

EPE 2015 - LS4a: 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 - LS4a: Advanced Power Converter Topologies

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   Charge Compensation Modulation Method of Partial-Resonant AC-Link Three-Phase Inverter
By Ilija PECELJ [View]
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Abstract: A novel modulation strategy for soft-switched, partial-resonant, high-frequency AC link inverters (PRAC) is proposed. The proposed method operates on a cycle-by-cycle basis, integrating link current and precisely controlling charge delivered to each output phase in one link cycle. Link current is measured in a high-speed, low-latency loop. By employing the proposed modulation strategy, very low total harmonic distortion of the output current waveform is achieved, resulting in small output filters. The validation of the proposed modulation strategy is carried out by numerical simulation using Matlab-Simulink software and experimental measurements on hardware prototype. Relevant results are disclosed and discussed in details in this paper.

   Dynamic Control and Dead-Time Compensation Method of an Isolated Dual-Active-Bridge DC-DC Converter
By Kazuto TAKAGI [View]
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Abstract: This paper presents dynamic control and a dead-time compensation method of an isolated dual-active-bridge (DAB) dc-dc converter. Conventional phase-shift control methods for the DAB converter may cause dc offsets in both inductor current and transformer magnetic flux density in transient states. The dynamic control method in this paper independently controls the diagonal switches in each H-bridge converter to modify the duty ratios in transient states. This method enables both inductor current and transformer magnetic flux density to be settled within a half switching period without any dc offsets. Moreover, the phase-shift error caused by the dead time is analyzed in terms of the switching angle. This analysis reveals that the dead time causes the switching-angle error in only one of the two H-bridge converters and may cause dc offsets. A new dead-time compensation method based on this analysis is proposed to eliminate the dc offsets and to achieve a good dynamic response. A 5-kW experimental system verifies the validity of the proposed control method.

   Identification of ZVS Soft Switching Boundaries for Three-Phase Dual Active Bridge Converters using Harmonic Analysis
By Jan RIEDEL [View]
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Abstract: While Three-Phase Dual-Active Bridge (DAB) converters are inherently capable of Zero-Voltage-Switching (ZVS), this operating region can be difficult to precisely identify for practical converter systems. This paper presents a new analytical approach based on harmonic analysis that accurately predicts the ZVS boundaries for Three-Phase DAB's with any interconnecting impedance network under all operating conditions.

   Three-phase Unidirectional DELTA-Switch Multistate Switching Cells-Based Multilevel Rectifier.
By Thiago SOEIRO [View]
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Abstract: This work presents a unidirectional three-phase PFC rectifier well-suited for applications targeting high efficiency, reduced conducted emissions and/or high power density. The characteristics of this circuit, which is based on the paralleling of DELTA-switch rectifiers by means of interphase transformers, including the principles of operation, modulation strategy, suitable PFC-oriented control scheme, and dimensioning equations are described in this work. Finally, a prototype is presented and experimental results verify the main characteristics of the proposed converter.

EPE 2015 - LS4a: 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 - LS4a: Advanced Power Converter Topologies
	[return to parent folder]

	Charge Compensation Modulation Method of Partial-Resonant AC-Link Three-Phase Inverter By Ilija PECELJ	[View] [Download]
Abstract: A novel modulation strategy for soft-switched, partial-resonant, high-frequency AC link inverters (PRAC) is proposed. The proposed method operates on a cycle-by-cycle basis, integrating link current and precisely controlling charge delivered to each output phase in one link cycle. Link current is measured in a high-speed, low-latency loop. By employing the proposed modulation strategy, very low total harmonic distortion of the output current waveform is achieved, resulting in small output filters. The validation of the proposed modulation strategy is carried out by numerical simulation using Matlab-Simulink software and experimental measurements on hardware prototype. Relevant results are disclosed and discussed in details in this paper.

	Dynamic Control and Dead-Time Compensation Method of an Isolated Dual-Active-Bridge DC-DC Converter By Kazuto TAKAGI	[View] [Download]
Abstract: This paper presents dynamic control and a dead-time compensation method of an isolated dual-active-bridge (DAB) dc-dc converter. Conventional phase-shift control methods for the DAB converter may cause dc offsets in both inductor current and transformer magnetic flux density in transient states. The dynamic control method in this paper independently controls the diagonal switches in each H-bridge converter to modify the duty ratios in transient states. This method enables both inductor current and transformer magnetic flux density to be settled within a half switching period without any dc offsets. Moreover, the phase-shift error caused by the dead time is analyzed in terms of the switching angle. This analysis reveals that the dead time causes the switching-angle error in only one of the two H-bridge converters and may cause dc offsets. A new dead-time compensation method based on this analysis is proposed to eliminate the dc offsets and to achieve a good dynamic response. A 5-kW experimental system verifies the validity of the proposed control method.

	Identification of ZVS Soft Switching Boundaries for Three-Phase Dual Active Bridge Converters using Harmonic Analysis By Jan RIEDEL	[View] [Download]
Abstract: While Three-Phase Dual-Active Bridge (DAB) converters are inherently capable of Zero-Voltage-Switching (ZVS), this operating region can be difficult to precisely identify for practical converter systems. This paper presents a new analytical approach based on harmonic analysis that accurately predicts the ZVS boundaries for Three-Phase DAB's with any interconnecting impedance network under all operating conditions.

	Three-phase Unidirectional DELTA-Switch Multistate Switching Cells-Based Multilevel Rectifier. By Thiago SOEIRO	[View] [Download]
Abstract: This work presents a unidirectional three-phase PFC rectifier well-suited for applications targeting high efficiency, reduced conducted emissions and/or high power density. The characteristics of this circuit, which is based on the paralleling of DELTA-switch rectifiers by means of interphase transformers, including the principles of operation, modulation strategy, suitable PFC-oriented control scheme, and dimensioning equations are described in this work. Finally, a prototype is presented and experimental results verify the main characteristics of the proposed converter.