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Asymmetrical-PWM DAB Converter With Extended ZVS/ZCS Range and Reduced Circulating Current for ESS Applications

The dual-active bridge (DAB) topology is commonly preferred in bidirectional applications due to several attractive features, including auto-adjust of power flow, galvanic insulation, wide voltage gain, and zero voltage switching (ZVS) capability over some power ranges. However, the efficiency of th...

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Published in:IEEE transactions on power electronics 2021-11, Vol.36 (11), p.12990-13001
Main Authors: Carvalho, Edivan Laercio, Felipe, Carla Aparecida, Bellinaso, Lucas Vizzotto, Stein, Carlos Marcelo de Oliveira, Cardoso, Rafael, Michels, Leandro
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container_issue 11
container_start_page 12990
container_title IEEE transactions on power electronics
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creator Carvalho, Edivan Laercio
Felipe, Carla Aparecida
Bellinaso, Lucas Vizzotto
Stein, Carlos Marcelo de Oliveira
Cardoso, Rafael
Michels, Leandro
description The dual-active bridge (DAB) topology is commonly preferred in bidirectional applications due to several attractive features, including auto-adjust of power flow, galvanic insulation, wide voltage gain, and zero voltage switching (ZVS) capability over some power ranges. However, the efficiency of the converter drops at light loads because the ZVS range is directly dependent on the circulating current. Assuming that the processed power is variable, the DAB converter's design must find a compromise between extending ZVS ranges and reducing the reactive power processing to ensure higher efficiency. Aiming this compromise, many papers propose hybrid approaches in which the modulation strategy is selected according to the processed power. However, this is not a simple solution because it demands multivariable control and offline optimizations. This paper proposes a modulation strategy to ensure ZVS and reduce the circulating current for the DAB converters. While the usual phase-shift modulation provides ZVS operation in a range of 40% to 100% of rated power, the proposed asymmetrical pulse-width modulation can obtain ZVS operation in a range of 2% to 100% of rated power. Experimental results demonstrated that the proposed strategy improves the converter efficiency for all power ranges, especially at light loads.
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source IEEE Electronic Library (IEL) Journals
subjects Asymmetry
Battery chargers
Bridge circuits
dc–dc power conversion
Efficiency
Electric bridges
Electric converters
Energy conversion efficiency
energy storage
Inductance
Insulation
Load flow
Modulation
Multivariable control
power electronics
Power flow
Power transformer insulation
Pulse duration modulation
Reactive power
Topology
Voltage gain
Zero current switching
Zero voltage switching
title Asymmetrical-PWM DAB Converter With Extended ZVS/ZCS Range and Reduced Circulating Current for ESS Applications
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