Multi-phase VSI DC-link capacitor considerations

Zipan Nie, Nigel Schofield

Research output: Contribution to journalArticle

Abstract

The modelling, control, switching schemes, novel applications etc. of multiphase voltage source inverters (VSIs) have been studied in recent years. While some DC-link capacitor considerations have been reported and ripple current assessments presented, the impact of these analyses on system design has not previously been quantified. These knowledge boundaries are expanded via this research. Meanwhile, a hypothesis is proposed that under the equitable operating conditions the increase in phase number could decrease the DC-link capacitor requirements compared with the representative conventional 3-phase VSIs. The analytical study shows the results corresponding to the hypothesis. Moreover, another hypothesis is made that other factors, e.g. switching strategies, carrier waveforms and interleaving techniques, also determine the DC-link capacitor requirements and some strategies could further decrease the DC-link capacitor requirements. The presented analytical study supports this hypothesis. The study is partially validated via experiments on a brushless permanent magnet synchronous motor (PMSM) drive system designed for equitable comparison of 3- and 9-phase VSIs driving PMSMs. Finally, the DC-link capacitor design procedure is proposed for two level multiphase VSIs.
LanguageEnglish
Number of pages8
JournalIET Electric Power Applications
Early online date7 Mar 2019
DOIs
Publication statusE-pub ahead of print - 7 Mar 2019

Fingerprint

Capacitors
Electric potential
Synchronous motors
Permanent magnets
Systems analysis
Experiments

Cite this

@article{6b6dfa45f5154bb1bac23bcb67a9c1f7,
title = "Multi-phase VSI DC-link capacitor considerations",
abstract = "The modelling, control, switching schemes, novel applications etc. of multiphase voltage source inverters (VSIs) have been studied in recent years. While some DC-link capacitor considerations have been reported and ripple current assessments presented, the impact of these analyses on system design has not previously been quantified. These knowledge boundaries are expanded via this research. Meanwhile, a hypothesis is proposed that under the equitable operating conditions the increase in phase number could decrease the DC-link capacitor requirements compared with the representative conventional 3-phase VSIs. The analytical study shows the results corresponding to the hypothesis. Moreover, another hypothesis is made that other factors, e.g. switching strategies, carrier waveforms and interleaving techniques, also determine the DC-link capacitor requirements and some strategies could further decrease the DC-link capacitor requirements. The presented analytical study supports this hypothesis. The study is partially validated via experiments on a brushless permanent magnet synchronous motor (PMSM) drive system designed for equitable comparison of 3- and 9-phase VSIs driving PMSMs. Finally, the DC-link capacitor design procedure is proposed for two level multiphase VSIs.",
author = "Zipan Nie and Nigel Schofield",
year = "2019",
month = "3",
day = "7",
doi = "10.1049/iet-epa.2019.0062",
language = "English",
journal = "IET Electric Power Applications",
issn = "1751-8660",
publisher = "Institution of Engineering and Technology",

}

Multi-phase VSI DC-link capacitor considerations. / Nie, Zipan; Schofield, Nigel.

In: IET Electric Power Applications, 07.03.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Multi-phase VSI DC-link capacitor considerations

AU - Nie, Zipan

AU - Schofield, Nigel

PY - 2019/3/7

Y1 - 2019/3/7

N2 - The modelling, control, switching schemes, novel applications etc. of multiphase voltage source inverters (VSIs) have been studied in recent years. While some DC-link capacitor considerations have been reported and ripple current assessments presented, the impact of these analyses on system design has not previously been quantified. These knowledge boundaries are expanded via this research. Meanwhile, a hypothesis is proposed that under the equitable operating conditions the increase in phase number could decrease the DC-link capacitor requirements compared with the representative conventional 3-phase VSIs. The analytical study shows the results corresponding to the hypothesis. Moreover, another hypothesis is made that other factors, e.g. switching strategies, carrier waveforms and interleaving techniques, also determine the DC-link capacitor requirements and some strategies could further decrease the DC-link capacitor requirements. The presented analytical study supports this hypothesis. The study is partially validated via experiments on a brushless permanent magnet synchronous motor (PMSM) drive system designed for equitable comparison of 3- and 9-phase VSIs driving PMSMs. Finally, the DC-link capacitor design procedure is proposed for two level multiphase VSIs.

AB - The modelling, control, switching schemes, novel applications etc. of multiphase voltage source inverters (VSIs) have been studied in recent years. While some DC-link capacitor considerations have been reported and ripple current assessments presented, the impact of these analyses on system design has not previously been quantified. These knowledge boundaries are expanded via this research. Meanwhile, a hypothesis is proposed that under the equitable operating conditions the increase in phase number could decrease the DC-link capacitor requirements compared with the representative conventional 3-phase VSIs. The analytical study shows the results corresponding to the hypothesis. Moreover, another hypothesis is made that other factors, e.g. switching strategies, carrier waveforms and interleaving techniques, also determine the DC-link capacitor requirements and some strategies could further decrease the DC-link capacitor requirements. The presented analytical study supports this hypothesis. The study is partially validated via experiments on a brushless permanent magnet synchronous motor (PMSM) drive system designed for equitable comparison of 3- and 9-phase VSIs driving PMSMs. Finally, the DC-link capacitor design procedure is proposed for two level multiphase VSIs.

U2 - 10.1049/iet-epa.2019.0062

DO - 10.1049/iet-epa.2019.0062

M3 - Article

JO - IET Electric Power Applications

T2 - IET Electric Power Applications

JF - IET Electric Power Applications

SN - 1751-8660

ER -