Enhanced Performance of Dual Inverter with a Floating Capacitor for Motor Drive Applications

Zhen Huang; Tao Yang; Paolo Giangrande; Shajjad Chowdhury; Michael Galea; Patrick Wheeler

doi:10.1109/TPEL.2020.3040029

Enhanced Performance of Dual Inverter with a Floating Capacitor for Motor Drive Applications

Zhen Huang, Tao Yang, Paolo Giangrande, Shajjad Chowdhury, Michael Galea, Patrick Wheeler

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

This article studies a dual inverter supplied by a dc-link and a floating capacitor (FC), emerged as a promising inverter topology for motor drive applications. For this type of inverter, the voltage ratio between the dc-link and the FC can be actively controlled. This ratio design is crucial as it essentially defines both the dc-link voltage utilization and the inverter output quality. Several voltage ratios have previously been discussed to enhance the dual inverter performance, but only one aspect, either the voltage utilization or the output quality, is investigated. As a result, although one performance aspect can be improved, the other aspect has been adversely affected. In this article, a comparative study considering both aspects is carried out for all the possible voltage ratios. Based on this analysis, the optimal ratios for different inverter modulation indices are identified. This is followed by proposing a ratio selection strategy to double the voltage utilization without degrading the output quality. This strategy enables an electric drive to work at a higher maximum speed without flux weakening for a given dc-link voltage. The claimed advantages have been proved by experimental tests on an open-end windings induction motor drive.

Original language	English
Article number	9268122
Pages (from-to)	6903-6916
Number of pages	14
Journal	IEEE Transactions on Power Electronics
Volume	36
Issue number	6
DOIs	https://doi.org/10.1109/TPEL.2020.3040029
State	Published - Jun 2021
Externally published	Yes

Funding

Manuscript received February 23, 2020; revised June 11, 2020 and October 5, 2020; accepted November 13, 2020. Date of publication November 24, 2020; date of current version February 5, 2021. This work was supported by the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 Research and Innovation Programme under Grant 807081. Recommended for publication by Associate Editor G. De Donato. (Corresponding author: Tao Yang.) Zhen Huang, Tao Yang, Paolo Giangrande, and Patrick Wheeler are with the Power Electronics Machines and Control Group, University of Nottingham, Nottingham NG7 2RD, U.K. (e-mail: [email protected]; tao. [email protected]; [email protected]; Pat.Wheeler@ nottingham.ac.uk).

Funders	Funder number
Horizon 2020 Framework Programme	945535, 807081

Keywords

Dual inverter
floating bridge
multilevel inverters
space vector modulation
voltage regulation

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/TPEL.2020.3040029

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abstract = "This article studies a dual inverter supplied by a dc-link and a floating capacitor (FC), emerged as a promising inverter topology for motor drive applications. For this type of inverter, the voltage ratio between the dc-link and the FC can be actively controlled. This ratio design is crucial as it essentially defines both the dc-link voltage utilization and the inverter output quality. Several voltage ratios have previously been discussed to enhance the dual inverter performance, but only one aspect, either the voltage utilization or the output quality, is investigated. As a result, although one performance aspect can be improved, the other aspect has been adversely affected. In this article, a comparative study considering both aspects is carried out for all the possible voltage ratios. Based on this analysis, the optimal ratios for different inverter modulation indices are identified. This is followed by proposing a ratio selection strategy to double the voltage utilization without degrading the output quality. This strategy enables an electric drive to work at a higher maximum speed without flux weakening for a given dc-link voltage. The claimed advantages have been proved by experimental tests on an open-end windings induction motor drive.",

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Enhanced Performance of Dual Inverter with a Floating Capacitor for Motor Drive Applications

Abstract

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Keywords

UN SDGs

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