NDLI: Multi-phase VSI DC-link capacitor considerations

Content Provider	IET Digital Library
Author	Nie, Zipan Schofield, Nigel
Abstract	The modelling, control, switching schemes, novel applications, etc. of multi-phase 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 the phase number decreases the DC-link capacitor requirements compared with the representative conventional three-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 can 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 the equitable comparison of three- and nine-phase VSIs driving PMSMs. Finally, the DC-link capacitor design procedure is proposed for two level multi-phase VSIs.
Starting Page	1804
Ending Page	1811
Page Count	8
ISSN	17518660
Volume Number	13
e-ISSN	17518679
Issue Number	Issue 11, Nov (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/13/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2019.0062
Journal	IET Electric Power Applications
Publisher Date	2019-03-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Analytical Study Brushless Permanent Magnet Synchronous Motor Drive System Brushless PMSM Drive System Carrier Waveforms DC-link Capacitor Design Procedure DC-link Capacitor Requirements Drive Interleaving Technique Invertors Multiphase Voltage Source Inverter Multiphase VSI DC-link Capacitor Considerations Nine-phase VSI Other Power Apparatus And Electric Machine Permanent Magnet Motors Phase Number Power Capacitor Ripple Current Assessments Switching Strategy Synchronous Machine Synchronous Motor Drive Three-phase VSI Two-level Multiphase VSI Voltage-source Converter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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