EMI performance comparison of two-level and three-level inverters in small dc-link capacitors based motor drives

Ram Krishan Maheshwari*, Stig Munk-Nielsen, Sergio Busquets-Monge

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The size of passive components in an adjustable speed drive can be reduced by using small dc-link capacitors. The EMI filter in the drive also consists of passive components. The size of the filter can be reduced by using a three-level inverter, which can have low output voltage distortion. However, the three-level inverter based on small dc-link capacitors requires a PWM strategy to maintain neutral-point voltage balance. In this paper, the common mode voltage, which is the determining factor for the EMI filter size, is analyzed for a virtual-vector-based PWM strategy. The common mode voltage, the shaft voltage, and the conducted emission for the small dc-link capacitor based three-level inverter are compared with that of the two-level inverter operated with space vector PWM strategy. Experimental results for the common mode voltage, the shaft voltage, and the conducted emission are presented. Results show that the conducted emission from the three-level inverter is lower than that of the two-level inverter. Thus, a three-level inverter requires a smaller EMI filter in motor drives with small dc-link capacitors.

Original languageEnglish
Title of host publicationProceedings - 2012 IEEE International Symposium on Industrial Electronics, ISIE 2012
Number of pages6
Publication date15. Aug 2012
Pages652-657
Article number6237166
ISBN (Print)9781467301589
DOIs
Publication statusPublished - 15. Aug 2012
Externally publishedYes
Event21st IEEE International Symposium on Industrial Electronics, ISIE 2012 - Hangzhou, China
Duration: 28. May 201231. May 2012

Conference

Conference21st IEEE International Symposium on Industrial Electronics, ISIE 2012
Country/TerritoryChina
CityHangzhou
Period28/05/201231/05/2012
SponsorThe Institute of Electrical and Electronics Engineers (IEEE), IEEE Industrial Electronics Society, College of Information Science and Electronic Engineering, Zhejiang University

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