Analysis and Design of a Modular Multilevel Converter With Trapezoidal Modulation for Medium and High Voltage DC-DC Transformers.
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| Title: | Analysis and Design of a Modular Multilevel Converter With Trapezoidal Modulation for Medium and High Voltage DC-DC Transformers. |
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| Authors: | Gowaid, I. A.1, Adam, Grain P.1, Ahmed, Shehab2, Holliday, Derrick1, Williams, Barry W.1 |
| Source: | IEEE Transactions on Power Electronics. Oct2015, Vol. 30 Issue 10, p5439-5457. 19p. |
| Subjects: | Cascade converters, Galvanic isolation, Switching circuits, Transformer insulation, DC-to-DC converters, Electric potential, Electric transformers |
| Abstract: | Conventional dual-active bridge topologies provide galvanic isolation and soft-switching over a reasonable operating range without dedicated resonant circuits. However, scaling the two-level dual-active bridge to higher dc voltage levels is impeded by several challenges among which the high dv/dt stress on the coupling transformer insulation. Gating and thermal characteristics of series switch arrays add to the limitations. To avoid the use of standard bulky modular multilevel bridges, this paper analyzes an alternative modulation technique, where staircase approximated trapezoidal voltage waveforms are produced; thus, alleviating developed dv/dt stresses. Modular design is realized by the utilization of half-bridge chopper cells. This way the analyzed dc-dc transformer employs modular multilevel converters operated in a new mode with minimal common-mode arm currents, as well as reduced capacitor size, hence reduced cell footprint. Suitable switching patterns are developed and various design and operation aspects are studied. Soft-switching characteristics will be shown to be comparable to those of the two-level dual-active bridge. Experimental results from a scaled test rig validate the presented concept. [ABSTRACT FROM AUTHOR] |
| Copyright of IEEE Transactions on Power Electronics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Analysis and Design of a Modular Multilevel Converter With Trapezoidal Modulation for Medium and High Voltage DC-DC Transformers. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Gowaid%2C+I%2E+A%2E%22">Gowaid, I. A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Adam%2C+Grain+P%2E%22">Adam, Grain P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ahmed%2C+Shehab%22">Ahmed, Shehab</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Holliday%2C+Derrick%22">Holliday, Derrick</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Williams%2C+Barry+W%2E%22">Williams, Barry W.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Power+Electronics%22">IEEE Transactions on Power Electronics</searchLink>. Oct2015, Vol. 30 Issue 10, p5439-5457. 19p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cascade+converters%22">Cascade converters</searchLink><br /><searchLink fieldCode="DE" term="%22Galvanic+isolation%22">Galvanic isolation</searchLink><br /><searchLink fieldCode="DE" term="%22Switching+circuits%22">Switching circuits</searchLink><br /><searchLink fieldCode="DE" term="%22Transformer+insulation%22">Transformer insulation</searchLink><br /><searchLink fieldCode="DE" term="%22DC-to-DC+converters%22">DC-to-DC converters</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+potential%22">Electric potential</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+transformers%22">Electric transformers</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Conventional dual-active bridge topologies provide galvanic isolation and soft-switching over a reasonable operating range without dedicated resonant circuits. However, scaling the two-level dual-active bridge to higher dc voltage levels is impeded by several challenges among which the high dv/dt stress on the coupling transformer insulation. Gating and thermal characteristics of series switch arrays add to the limitations. To avoid the use of standard bulky modular multilevel bridges, this paper analyzes an alternative modulation technique, where staircase approximated trapezoidal voltage waveforms are produced; thus, alleviating developed dv/dt stresses. Modular design is realized by the utilization of half-bridge chopper cells. This way the analyzed dc-dc transformer employs modular multilevel converters operated in a new mode with minimal common-mode arm currents, as well as reduced capacitor size, hence reduced cell footprint. Suitable switching patterns are developed and various design and operation aspects are studied. Soft-switching characteristics will be shown to be comparable to those of the two-level dual-active bridge. Experimental results from a scaled test rig validate the presented concept. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of IEEE Transactions on Power Electronics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1109/TPEL.2014.2377719 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 19 StartPage: 5439 Subjects: – SubjectFull: Cascade converters Type: general – SubjectFull: Galvanic isolation Type: general – SubjectFull: Switching circuits Type: general – SubjectFull: Transformer insulation Type: general – SubjectFull: DC-to-DC converters Type: general – SubjectFull: Electric potential Type: general – SubjectFull: Electric transformers Type: general Titles: – TitleFull: Analysis and Design of a Modular Multilevel Converter With Trapezoidal Modulation for Medium and High Voltage DC-DC Transformers. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Gowaid, I. A. – PersonEntity: Name: NameFull: Adam, Grain P. – PersonEntity: Name: NameFull: Ahmed, Shehab – PersonEntity: Name: NameFull: Holliday, Derrick – PersonEntity: Name: NameFull: Williams, Barry W. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 08858993 Numbering: – Type: volume Value: 30 – Type: issue Value: 10 Titles: – TitleFull: IEEE Transactions on Power Electronics Type: main |
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