Buck-Boost Dual-Leg-Integrated Step-Up Inverter with Low THD and Single Variable Control for Single-Phase High-Frequency AC Microgrids

Qin, L; Hu, M; Lu, DDC; Feng, Z; Wang, Y; Kan, J

Buck-Boost Dual-Leg-Integrated Step-Up Inverter with Low THD and Single Variable Control for Single-Phase High-Frequency AC Microgrids

Qin, L Hu, M Lu, DDC

Feng, Z Wang, Y Kan, J

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Publication Type:: Journal Article
Citation:: IEEE Transactions on Power Electronics, 2018, 33 (7), pp. 6278 - 6291
Issue Date:: 2018-07-01

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Field	Value	Language
dc.contributor.author	Qin, L	en_US
dc.contributor.author	Hu, M	en_US
dc.contributor.author	Lu, DDC https://orcid.org/0000-0003-2145-0580	en_US
dc.contributor.author	Feng, Z	en_US
dc.contributor.author	Wang, Y	en_US
dc.contributor.author	Kan, J	en_US
dc.date.issued	2018-07-01	en_US
dc.identifier.citation	IEEE Transactions on Power Electronics, 2018, 33 (7), pp. 6278 - 6291	en_US
dc.identifier.issn	0885-8993	en_US
dc.identifier.uri	http://hdl.handle.net/10453/123701
dc.description.abstract	© 1986-2012 IEEE. To support the development of high-frequency ac microgrids in terms of compact design, high-voltage gain and low total harmonic distortion (THD), a buck-boost dual-leg-integrated step-up inverter is proposed in this paper. The inverter is formed by integrating a buck-boost converter into a conventional single-phase full-bridge inverter by sharing the upper switch and the body diode of the lower switch in both bridge-legs. Consequently, the component count is significantly reduced over the step-up inverter counterparts. In addition, to address the drawbacks of hybrid modulation methods adopted by existing dual-leg-integrated inverters, such as double-variable control, and high THD of output voltage/current at high input voltage and heavy load conditions, unipolar frequency doubling sinusoidal pulse width modulation scheme is adopted in this inverter. As a result, the modulation ratio M becomes the only control variable to regulate the output voltage/current and the control is simplified. The THD of the proposed inverter output can remain low throughout the entire input voltage range and load power range. This paper presents the topology derivation procedure, operation principle, and steady-state characteristics of the proposed inverter. To validate the effectiveness of theory, experimental results of a 400 W hardware prototype, where the output voltage frequency is at 500 Hz, are reported.	en_US
dc.relation.ispartof	IEEE Transactions on Power Electronics	en_US
dc.relation.isbasedon	10.1109/TPEL.2017.2742667	en_US
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Electrical & Electronic Engineering	en_US
dc.title	Buck-Boost Dual-Leg-Integrated Step-Up Inverter with Low THD and Single Variable Control for Single-Phase High-Frequency AC Microgrids	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	33	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	closed_access	*
pubs.issue	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	33	en_US

Abstract:

© 1986-2012 IEEE. To support the development of high-frequency ac microgrids in terms of compact design, high-voltage gain and low total harmonic distortion (THD), a buck-boost dual-leg-integrated step-up inverter is proposed in this paper. The inverter is formed by integrating a buck-boost converter into a conventional single-phase full-bridge inverter by sharing the upper switch and the body diode of the lower switch in both bridge-legs. Consequently, the component count is significantly reduced over the step-up inverter counterparts. In addition, to address the drawbacks of hybrid modulation methods adopted by existing dual-leg-integrated inverters, such as double-variable control, and high THD of output voltage/current at high input voltage and heavy load conditions, unipolar frequency doubling sinusoidal pulse width modulation scheme is adopted in this inverter. As a result, the modulation ratio M becomes the only control variable to regulate the output voltage/current and the control is simplified. The THD of the proposed inverter output can remain low throughout the entire input voltage range and load power range. This paper presents the topology derivation procedure, operation principle, and steady-state characteristics of the proposed inverter. To validate the effectiveness of theory, experimental results of a 400 W hardware prototype, where the output voltage frequency is at 500 Hz, are reported.

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http://hdl.handle.net/10453/123701