The Comprehensive Circuit-Parameter Estimating Strategies for Output-Parallel Dual-Active-Bridge DC-DC Converters With Tunable Power Sharing Control

The centralized output-parallel dual-active-bridge (OP-DAB) dc-dc system is a promising candidate for achieving isolated dc-dc energy conversion with large current and power rating. To implement the flexible power sharing performance of the OP-DAB dc-dc converter, a simple tunable power sharing (TPS...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 67; no. 9; pp. 7583 - 7594
Main Authors Hou, Nie, Li, Yunwei
Format Journal Article
LanguageEnglish
Published New York IEEE 01.09.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bridge circuits
Circuit-parameter estimation
Circuits
Control methods
DC-DC power converters
Electric bridges
Electric converters
Electric potential
Energy conversion
Estimation
output-parallel dual-active-bridge (OP-DAB) system
Parameter estimation
PI control
plug-in or -out
Power generation
Power rating
power sharing performance
Sensors
Voltage
Voltage control
Voltage measurement
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Summary:The centralized output-parallel dual-active-bridge (OP-DAB) dc-dc system is a promising candidate for achieving isolated dc-dc energy conversion with large current and power rating. To implement the flexible power sharing performance of the OP-DAB dc-dc converter, a simple tunable power sharing (TPS) strategy is proposed with the single-phase-shift method in this article. Based on the TPS strategy, the excellent dynamic performance under disturbances of input voltage for each module and load resistor can be provided. However, inaccurate circuit-parameter information always damages the power sharing performance among different DAB converters. Therefore, the comprehensive circuit-parameter estimating schemes proposed for different conditions of the OP-DAB dc-dc system including the start-up process, the working process and plugging-in a new DAB dc-dc converter, respectively. Moreover, the hot swap (plug-in and plug-out) control methods of the DAB converter without large influence on output voltage is also discussed in detail. Experimental results are obtained to verify the analysis in this article and the excellent performance of the proposed methods.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2019.2941155